About Android

Hide showed Toast Messages

2011-11-16T08:18:00.000-08:00

In my App, there is a list, when a user clicks on an button, a toast message is being displayed, 10 items - 10 toast messages, so if the user clicks 10 times, then presses the button... he/she has to wait for some seconds, until he's able to read the menu option text.

I have found the below solution to hide the shows toast message.

public class SampleToastActivity extends Activity {

Toast myToast;

static int i=0;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Button b1 = (Button) findViewById(R.id.button2);

b1.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

i++;

if(myToast!=null){

myToast.cancel();

myToast.setText("Count"+i);

}else{

myToast = Toast.makeText(SampleToastActivity.this, "Sample"+i, 10);

}

myToast.show();

}

});

}

Sample CheckedTextView in listview , Reading contacts all emails

2011-11-07T19:24:00.000-08:00

Here, you can find the example of checked textview in the listview and read all email address in the android phone

1. Design the main Layout & row Layout with Checked TextView
Main.xml
< ListView android:id="@+id/listView1" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:background="#ffffff" />

Row.xml
< CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/checkedTextView1" android:paddingLeft="20dip"
android:paddingRight="20dip" android:paddingTop="10dip"
android:paddingBottom="10dip" android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="?android:attr/listPreferredItemHeight"
android:gravity="center_vertical" android:checkMark="@android:drawable/checkbox_off_background"
android:textColor="#000000" />

2. Create the CursurAdpater

private class ContactListAdapter extends CursorAdapter {

public ContactListAdapter(Context context, Cursor c) {
super(context, c);
}

@Override
public void bindView(View view, Context context, Cursor cursor) {
String o = cursor
.getString(cursor
.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));
CheckedTextView tt = (CheckedTextView) view
.findViewById(R.id.checkedTextView1);
tt.setText(o);
}

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
View v;
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.row, null);
return v;
}
}
3. set the Contact Cursor to the ContactListAdapter
ContentResolver cr = getContentResolver();
Cursor emails = cr.query(
ContactsContract.CommonDataKinds.Email.CONTENT_URI, null, null,
null, null);
l.setAdapter(new ContactListAdapter(this, emails));

4. Change the State while select the Item
l.setOnItemClickListener(new OnItemClickListener() {

public void onItemClick(AdapterView arg0, View v, int arg2,
long arg3) {

CheckedTextView tt = (CheckedTextView) v
.findViewById(R.id.checkedTextView1);
if (!tt.isChecked()) {
tt.setChecked(true);
tt.setCheckMarkDrawable(android.R.drawable.checkbox_on_background);
} else {
tt.setChecked(false);
tt.setCheckMarkDrawable(android.R.drawable.checkbox_off_background);
}

}
});

5. Add the Contact Read Permission in androidmanifest.xml
< uses-permission android:name="android.permission.READ_CONTACTS" />

Sample Program :

public class ContactListingActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ListView l = (ListView) findViewById(R.id.listView1);
Cursor emails = getContentResolver().query(
ContactsContract.CommonDataKinds.Email.CONTENT_URI, null, null,
null, null);
l.setAdapter(new ContactListAdapter(this, emails));
l.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView arg0, View v, int arg2,
long arg3) {
CheckedTextView tt = (CheckedTextView) v
.findViewById(R.id.checkedTextView1);
if (!tt.isChecked()) {
tt.setChecked(true);
tt.setCheckMarkDrawable(android.R.drawable.checkbox_on_background);
} else {
tt.setChecked(false);
tt.setCheckMarkDrawable(android.R.drawable.checkbox_off_background);
}

}
});

}

private class ContactListAdapter extends CursorAdapter {
public ContactListAdapter(Context context, Cursor c) {
super(context, c);
}

@Override
public void bindView(View view, Context context, Cursor cursor) {
String o = cursor
.getString(cursor
.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));
CheckedTextView tt = (CheckedTextView) view
.findViewById(R.id.checkedTextView1);
tt.setText(o);
}

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
View v;
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.row, null);
return v;
}
}
}

Gesture based action

2011-08-12T05:29:00.001-07:00

Here we are discussing about how to set that as the gesture listener for the views that I add.

My requirement : I have list of images in a listview with url. When the user wants view the full image then user click the image on the list view

it will take to me the anonther activity and open in a imageview. and as a user wants to tee the next nexe or previous image with come back to listview page

Solution : I have created the HashMap Contains the list of images and pass the selected images name as bundle string. In a detail view created the async task the fetch image from the internet

implement the gestureListener. In this article we discussing about that

Related : gesture move action, gesture based action, example geatures

1. Create a Activity implements OnClickListener

public class MySample1Activity extends Activity implements OnClickListener {

........

}

2. Initialize below required object for gestureListener

ViewConfiguration vc;

static int SWIPE_MAX_OFF_PATH = 250;

static int SWIPE_MIN_DISTANCE = 100;

static int SWIPE_THRESHOLD_VELOCITY = 100;

private GestureDetector gestureDetector;

View.OnTouchListener gestureListener;

3. Set Densitybased velocity

vc = ViewConfiguration.get(this);

SWIPE_MIN_DISTANCE = vc.getScaledTouchSlop();

SWIPE_THRESHOLD_VELOCITY = vc.getScaledMinimumFlingVelocity();

4. Create a Custom GestureListener class which extends SimpleOnGestureListener

class MyGestureDetector extends SimpleOnGestureListener {

}

5. Override the onFling() and implement the geature move action

@Override

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,

float velocityY) {

try {

if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)

return false;

// right to left swipe

if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE

&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {

Toast.makeText(MySample1Activity.this, "Left Swipe",

Toast.LENGTH_SHORT).show();

} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE

&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {

Toast.makeText(MySample1Activity.this, "Right Swipe",

Toast.LENGTH_SHORT).show();

}

} catch (Exception e) {

// nothing

}

return false;

}

Full SourceCode

public class MySample1Activity extends Activity implements OnClickListener {

/** Called when the activity is first created. */

TextView tView;

ViewConfiguration vc;

static int SWIPE_MAX_OFF_PATH = 250;

static int SWIPE_MIN_DISTANCE = 100;

static int SWIPE_THRESHOLD_VELOCITY = 100;

private GestureDetector gestureDetector;

View.OnTouchListener gestureListener;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

tView = (TextView) findViewById(R.id.textview1);

vc = ViewConfiguration.get(this);

SWIPE_MIN_DISTANCE = vc.getScaledTouchSlop();

SWIPE_THRESHOLD_VELOCITY = vc.getScaledMinimumFlingVelocity();

gestureDetector = new GestureDetector(new MyGestureDetector());

gestureListener = new View.OnTouchListener() {

public boolean onTouch(View v, MotionEvent event) {

if (gestureDetector.onTouchEvent(event)) {

return true;

}

return false;

}

};

tView.setOnClickListener(this);

tView.setOnTouchListener(gestureListener);

}

class MyGestureDetector extends SimpleOnGestureListener {

@Override

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,

float velocityY) {

try {

if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)

return false;

// right to left swipe

if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE

&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {

Toast.makeText(MySample1Activity.this, "Left Swipe",

Toast.LENGTH_SHORT).show();

} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE

&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {

Toast.makeText(MySample1Activity.this, "Right Swipe",

Toast.LENGTH_SHORT).show();

}

} catch (Exception e) {

// nothing

}

return false;

}

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

}

2011-07-29T00:17:00.001-07:00

In this blog we are selecting multiple images.Here I have created the custom view components and activity used to get the selected images.

1. Custom ViewComponet

< RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent" android:layout_height="fill_parent">

< ImageView android:id="@+id/thumbImage" android:layout_width="wrap_content"

android:layout_height="wrap_content" android:layout_centerInParent="true" />

< CheckBox android:id="@+id/itemCheckBox" android:layout_width="wrap_content"

android:layout_height="wrap_content" android:layout_alignParentRight="true"

android:layout_alignParentTop="true" />

< /RelativeLayout>

2. SampleActivity

1. Create a ImageAdapter

public class ImageAdapter extends BaseAdapter {

}

2. Inflate the View

mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

convertView = mInflater.inflate(R.layout.mygallert, null);

3. find the required View

imageview = (ImageView) convertView.findViewById(R.id.thumbImage);

checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox);

4. Control the image selection

imageview.setBackgroundResource(R.drawable.icon);

checkbox.setId(position);

checkbox.setChecked(false);

checkbox.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

CheckBox cb = (CheckBox) v;

if (cb.isChecked()) {

cb.setChecked(true);

selectedImage.add(v.getId());

} else {

cb.setChecked(false);

selectedImage.remove(v.getId());

}

});

4. Track the image selection

selectedImage.add(v.getId());

selectedImage.remove(v.getId());

5. displays the selected Image Position

Toast.makeText(SampleActivity.this,"" + SampleActivity.this.selectedImage, 10).show();

Sample

public class SampleActivity extends Activity {

private ImageAdapter imageAdapter;

private Set selectedImage = new HashSet();

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);

Button selectedImage = (Button) findViewById(R.id.selectBtn);

imageAdapter = new ImageAdapter();

imagegrid.setAdapter(imageAdapter);

selectedImage.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

Toast.makeText(SampleActivity.this,

"" + SampleActivity.this.selectedImage, 10).show();

}

});

}

public class ImageAdapter extends BaseAdapter {

private LayoutInflater mInflater;

public ImageAdapter() {

mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}

public Object getItem(int position) {

return position;

}

public long getItemId(int position) {

return position;

}

public View getView(int position, View convertView, ViewGroup parent) {

ImageView imageview;

CheckBox checkbox;

convertView = mInflater.inflate(R.layout.mygallert, null);

imageview = (ImageView) convertView.findViewById(R.id.thumbImage);

checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox);

imageview.setBackgroundResource(R.drawable.icon);

checkbox.setId(position);

checkbox.setChecked(false);

checkbox.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

CheckBox cb = (CheckBox) v;

if (cb.isChecked()) {

cb.setChecked(true);

selectedImage.add(v.getId());

} else {

cb.setChecked(false);

selectedImage.remove(v.getId());

}

});

return convertView;

}

public int getCount() {

return 5;

}

Required XML

main.xml

< ?xml version="1.0" encoding="utf-8"?>

< RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent" android:layout_height="fill_parent">

< Button android:id="@+id/selectBtn" android:layout_width="wrap_content"

android:layout_height="wrap_content" android:text="Select"

android:layout_alignParentBottom="true"

android:layout_centerHorizontal="true" android:minWidth="200px" />

< GridView android:id="@+id/PhoneImageGrid"

android:layout_width="fill_parent" android:layout_height="fill_parent"

android:numColumns="auto_fit" android:verticalSpacing="10dp"

android:horizontalSpacing="10dp" android:columnWidth="90dp"

android:stretchMode="columnWidth" android:gravity="center"

android:layout_above="@id/selectBtn" />

< /RelativeLayout>

mygallery.xml

< ?xml version="1.0" encoding="utf-8"?>

< RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent" android:layout_height="fill_parent">

< ImageView android:id="@+id/thumbImage" android:layout_width="wrap_content"

android:layout_height="wrap_content" android:layout_centerInParent="true" />

< CheckBox android:id="@+id/itemCheckBox" android:layout_width="wrap_content"

android:layout_height="wrap_content" android:layout_alignParentRight="true"

android:layout_alignParentTop="true" />

< /RelativeLayout>

Android Shell Commands

2011-05-23T19:42:00.000-07:00

Here you can find the available command set in the shell by typing this at the android shell prompt:

dumpcrash, am, dumpstate, input, itr, monkey, pm, svc, ssltest,

debuggerd, dhcpcd, hostapd_cli, fillup, linker, logwrapper, telnetd, iftop, mkdosfs, mount,

mv, notify, netstat, printenv, reboot, ps, renice, rm, rmdir,rmmod, sendevent, schedtop,

ping, sh, hciattach, sdptool, logcat, servicemanager, dbus-daemon, debug_tool, flash_image, installd,

dvz, hostapd, htclogkernel, mountd, qemud, radiooptions, toolbox, hcid,

route, setprop, sleep, setconsole, smd, stop, top, start, umount,

vmstat, wipe, watchprops, sync, netcfg, Chmod, date, dd, cmp, cat, dmesg, df,

getevent, getprop, hd, id, ifconfig, insmod, ioctl, kill,

ln, log, lsmod, ls, mkdir, dumpsys, service, playmp3, sdutil,

rild, dalvikvm, dexopt, surfaceflinger, app_process, mediaserver, system_server,

Combine two images in android java

2011-05-22T21:56:00.001-07:00

In this blog we are combine two images and we have two images stored locally on an SD card or drawble folder in android.

Steps:

Read the image from Source

InputStream istream = context.getResources().openRawResource(R.drawable.img1);

try {

image1 = BitmapFactory.decodeStream(istream);

istream = context.getResources().openRawResource(R.drawable.img2);

image2 = BitmapFactory.decodeStream(istream);

} finally {

try {

istream.close();

} catch (IOException e) {

}

Define the Image property

int width = 0, height = 0;

if (c.getWidth() > s.getWidth()) {

width = c.getWidth();

height = c.getHeight() + s.getHeight();

} else {

width = s.getWidth();

height = c.getHeight() + s.getHeight();

}

Create your target Bitmap,

Bitmap combinedImages = Bitmap.createBitmap(width * 2, height, Bitmap.Config.ARGB_8888);

Create a Canvas for it,

Canvas comboImage = new Canvas(combinedImages);

Use Canvas.drawBitmap to blit each source bitmap into your target bitmap

comboImage.drawBitmap(image1, 0f, 0f, null);

comboImage.drawBitmap(image2, 0f, image1.getHeight()+1, null);

Example:

public Bitmap combineImages(Context context, int img1, int img2) {

// Bitmap[] mBitmap = new Bitmap[6];

Bitmap image1, image2;

InputStream istream = context.getResources().openRawResource(img1);

try {

image1 = BitmapFactory.decodeStream(istream);

istream = context.getResources().openRawResource(img2);

image2 = BitmapFactory.decodeStream(istream);

} finally {

try {

istream.close();

} catch (IOException e) {

}

int width = 0, height = 0;

if (c.getWidth() > s.getWidth()) {

width = c.getWidth();

height = c.getHeight() + s.getHeight();

} else {

width = s.getWidth();

height = c.getHeight() + s.getHeight();

}

Bitmap combinedImages = null;

combinedImages = Bitmap

.createBitmap(width * 2, height, Bitmap.Config.ARGB_8888);

Canvas comboImage = new Canvas(combinedImages);

comboImage.drawBitmap(c, 0f, 0f, null);

comboImage.drawBitmap(s, 0f, c.getHeight()+1, null);

return cs;

}

Scrollable Text View in andriod -2

2011-05-15T11:11:00.001-07:00

This article helps to making Scrollable TextView using TextView with dispatchKeyEvent

we can make a scrollable textview while implement the setMovementMethod and dispatchKeyEvent.

1. private TextView mTextView;

2. Set the Required data in the TextView

mTextView = (TextView) findViewById(R.id.textView1);

mTextView.setText("this is for testing \nthis is for testing \nthis is for testing

\nthis is for testing \nthis is for testing \nthis is for testing \n");

3. mTextView.setMovementMethod(new ScrollingMovementMethod(){.....})

4. Override the methods in ScrollingMovementMethod

new ScrollingMovementMethod() {

public void onTakeFocus(TextView widget, Spannable text, int dir) {}

@Override

public boolean onKeyDown(TextView widget, Spannable buffer,

int keyCode, KeyEvent event) {

switch (keyCode) {

case KeyEvent.KEYCODE_DPAD_DOWN:

for (int i = 0, scrollAmount = getScrollAmount(widget); i < scrollAmount; i++) {

down(widget, buffer);

}

return true;

case KeyEvent.KEYCODE_DPAD_UP:

for (int i = 0, scrollAmount = getScrollAmount(widget); i < scrollAmount; i++) {

up(widget, buffer);

}

return true;

default:

return super.onKeyDown(widget, buffer, keyCode, event);

}

private int getScrollAmount(TextView widget) {

final int visibleLineCount = (int) ((1f * widget.getHeight()) / widget

.getLineHeight());

int scrollAmount = visibleLineCount - 1;

if (scrollAmount < 1) {

scrollAmount = 1;

}

return scrollAmount;

}

5. Call the dispatch method in your code

mTextView.dispatchKeyEvent(event);

SAMPLE

public class MainActivity extends Activity {

/** Called when the activity is first created. */

private TextView mTextView;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mTextView = (TextView) findViewById(R.id.textView1);

mTextView

.setText("this is for testing \nthis is for testing \nthis is for testing \nthis is for testing \nthis is for testing \nthis is for testing \n");

mTextView.setMovementMethod(new ScrollingMovementMethod() {

public void onTakeFocus(TextView widget, Spannable text, int dir) {

}

@Override

public boolean onKeyDown(TextView widget, Spannable buffer,

int keyCode, KeyEvent event) {

switch (keyCode) {

case KeyEvent.KEYCODE_DPAD_DOWN:

for (int i = 0, scrollAmount = getScrollAmount(widget); i < scrollAmount; i++) {

down(widget, buffer);

}

return true;

case KeyEvent.KEYCODE_DPAD_UP:

for (int i = 0, scrollAmount = getScrollAmount(widget); i < scrollAmount; i++) {

up(widget, buffer);

}

return true;

default:

return super.onKeyDown(widget, buffer, keyCode, event);

}

private int getScrollAmount(TextView widget) {

final int visibleLineCount = (int) ((1f * widget.getHeight()) / widget

.getLineHeight());

int scrollAmount = visibleLineCount - 1;

if (scrollAmount < 1) {

scrollAmount = 1;

}

return scrollAmount;

}

});

}

@Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

switch (keyCode) {

case KeyEvent.KEYCODE_DPAD_DOWN:

return true;

case KeyEvent.KEYCODE_DPAD_UP:

mTextView.dispatchKeyEvent(event);

return true;

default:

return super.onKeyDown(keyCode, event);

}

Scrollable Text View in andriod

2011-05-15T10:29:00.000-07:00

This article helps to making Scrollable TextView in Android.

We can do it two ways. 1.Create a TextView inside the ScrollView and 2. TextView with dispatch Events.

Create a TextView inside the ScrollView

< ScrollView android:layout_width="fill_parent" android:layout_height="wrap_content"

android:fillViewport="true">

< LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent">

< TextView android:text="@+id/TextView01"

android:id="@+id/mTextView"

android:layout_width="fill_parent"

android:layout_height="fill_parent">< / TextView>

< / LinearLayout>

< / ScrollView>

Activity Implementation

mTextView = (TextView) findViewById(R.id.logTextView);

mTextView .setText("");

mTextView .setMovementMethod(ScrollingMovementMethod.getInstance());

How to Obfuscated Android Code

2011-05-12T08:59:00.000-07:00

Obfuscated code is source or machine code that has been made difficult to understand for humans. Programmers may deliberately obfuscate code to conceal its purpose or its logic to prevent tampering, deter reverse engineering, or as a puzzle or recreational challenge for someone reading the source code.

Programs known as obfuscators transform readable code into obfuscated code using various techniques. Code obfuscation is different in essence from hardware obfuscation, where description and/or structure of a circuit is modified to hide its functionality.

The following steps to describe the android obfuscation

1) Setup the obfuscated environment Download the follwing file before you starts

ProGuard

ProGuard is a free Java class file shrinker, optimizer, obfuscator, and preverifier. It detects and removes unused classes, fields, methods, and attributes. It optimizes bytecode and removes unused instructions. It renames the remaining classes, fields, and methods using short meaningless names. Finally, it preverifies the processed code for Java 6 or for Java Micro Edition.

Download From Sourceforge : http://sourceforge.net/projects/proguard/files/

Reference : http://proguard.sourceforge.net/

Download files from internet

add-proguard-release.xml
procfg.txt

1) To update an existing Android project, open a command-line and navigate to the tools/ directory of your SDK. Now run:

android update project --name --target --path

2) So, now you have a signed build from the command line, but still no obfuscated build.

To make things easy, you’re going to want to get two helper files:

add-proguard-release.xml and procfg.txt

Copy these files into your root directory (where the build.xml file found).

3) To add Proguard to your build, you first need to edit your local properties file to add the location of the directory that Proguard is installed in:

proguard.dir=/Directory/Proguard/Is/Installed/In

3) Finally... you need to add our script to your build file and have it override a few targets. To do this, we use the XML “entity” construct. At the top of your build.xml file, add an entity that references our script file:

]

4) By default ADT creates a proguard.cfg file with every new project, so if you have an existing project just copy it over from a new dummy project. The next step is to enable ProGuard, you do this by adding the following to your default.properties file:

proguard.config=proguard.cfg

(assuming proguard.cfg is the ProGuard configuration file created for you, or copied from a new project, into the project root folder.)

Read Text From the Raw Content in Resource Folder.

2011-04-28T00:59:00.001-07:00

You can store the raw content in the raw folder and read using the below method..

1. Create a file in and Raw content

2. Create Method called readTextResource() in the util class

3. Use the below code to read the data

StringBuffer strBuffer = new StringBuffer();

InputStream inputStream = null;

try {

inputStream = owner.getResources().openRawResource(resourceId);

BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));

String str = br.readLine();

while (str != null) {

strBuffer.append(str);

str = br.readLine();

}

} catch (IOException e) {

} finally {

try {

if (inputStream != null) {

inputStream.close();

}

} catch (IOException e) {

}

4. Return the StringBuffer value.

5. If you need a html format, you can use the html util class

Html.fromHtml(text); - It returns Spanned instance.

Sample Code

-----------

public class MainActivity extends Activity {

private Spanned mText = null;

private TextView mTextView;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mTextView = (TextView) findViewById(R.id.sampleText);

if (mText == null) {

String text = readTextResource(R.raw.license, this);

mText = Html.fromHtml(text);

}

mTextView.setText(mText);

}

public String readTextResource(int resourceId, Activity owner) {

StringBuffer strBuffer = new StringBuffer();

InputStream inputStream = null;

try {

inputStream = owner.getResources().openRawResource(resourceId);

BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));

String str = br.readLine();

while (str != null) {

strBuffer.append(str);

str = br.readLine();

}

} catch (IOException e) {

} finally {

try {

if (inputStream != null) {

inputStream.close();

}

} catch (IOException e) {

}

return strBuffer.toString();

}

Android Tips - Using Layout Param

2011-04-25T05:17:00.001-07:00

Layout Param is used to change the layout properties. You can create a layout instance and assign to required view.

LinearLayout.LayoutParams layoutParam = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

Sample Code

LinearLayout.LayoutParams mLayoutParam = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
Button mButton = new Button(this);
mButton.setLayoutParams(layoutParam);

The above code works fine but this is not a current solution. It should like the below code

Button mButton = new Button(this);
ViewGroup.LayoutParam mLayoutParam= mButton.getLayoutParams();
mLayoutParam.height = ViewGroup.LayoutParams.FILL_PARENT

Thanks to Ashok , I have done the mistake and corrected me

Android Window Leak

2011-04-25T05:02:00.000-07:00

The WindowLeaked exception in the log usually happens when you have some sort of async task that is finishing after the activity that began it is destroyed.
Solution for the above issue, we can dismiss the progress dialog before finish the activity.

Issue :

Activity com.sample.ViewLeakIssueActivity has leaked window com.android.internal.policy.impl.TvWindow$DecorView@6bc30788 that was originally added here
E/WindowManager( 1687): at android.view.ViewRoot.(ViewRoot.java:230)
E/WindowManager( 1687): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
-----

Sample Leak Issue
public class ViewLeakIssueActivity extends Activity {
volatile ProgressDialog pd;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pd = ProgressDialog.show(ViewLeakIssueActivity.this, "", "test...", true);

new Thread() {
public void run() {
try {
sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("@@@@@@@@@@@"+ViewLeakIssueActivity.this+pd.isShowing());

pd.dismiss();
}
}.start();

finish();

}

}

Solution for the above issue, we can dismiss the progress dialog before finish the activity.

@Override
public void finish() {
if(pd.isShowing()){
pd.dismiss();
}
super.finish();
}

Android Versions...

2011-03-31T03:42:00.000-07:00

Lifecycle of an Android Application

2010-07-11T05:49:00.001-07:00

In most cases, every Android application runs in its own Linux process. This process is created for the application when some of its code needs to be run, and will remain running until it is no longer needed and the system needs to reclaim its memory for use by other applications.

An important and unusual feature of Android is that an application process's lifetime is not directly controlled by the application itself. Instead, it is determined by the system through a combination of the parts of the application that the system knows are running, how important these things are to the user, and how much overall memory is available in the system.

It is important that application developers understand how different application components (in particular Activity, Service, and IntentReceiver) impact the lifetime of the application's process. Not using these components correctly can result in the system killing the application's process while it is doing important work.

A common example of a process lifecycle bug is an IntentReceiver that starts a thread when it receives an Intent in its onReceiveIntent() method, and then returns from the function. Once it returns, the system considers that IntentReceiver to be no longer active, and thus its hosting process no longer needed (unless other application components are active in it). Thus, it may kill the process at any time to reclaim memory, terminating the spawned thread that is running in it. The solution to this problem is to start a Service from the IntentReceiver, so the system knows that there is still active work being done in the process.

To determine which processes should be killed when low on memory, Android places them into an "importance hierarchy" based on the components running in them and the state of those components. These are, in order of importance:

   1. A foreground process is one holding an Activity at the top of the screen that the user is interacting with (its onResume() method has been called) or an IntentReceiver that is currently running (its onReceiveIntent() method is executing). There will only ever be a few such processes in the system, and these will only be killed as a last resort if memory is so low that not even these processes can continue to run. Generally at this point the device has reached a memory paging state, so this action is required in order to keep the user interface responsive.

   2. A visible process is one holding an Activity that is visible to the user on-screen but not in the foreground (its onPause() method has been called). This may occur, for example, if the foreground activity has been displayed with a dialog appearance that allows the previous activity to be seen behind it. Such a process is considered extremely important and will not be killed unless doing so is required to keep all foreground processes running.

   3. A service process is one holding a Service that has been started with the startService() method. Though these processes are not directly visible to the user, they are generally doing things that the user cares about (such as background mp3 playback or background network data upload or download), so the system will always keep such processes running unless there is not enough memory to retain all foreground and visible process.

   4. A background process is one holding an Activity that is not currently visible to the user (its onStop() method has been called). These processes have no direct impact on the user experience. Provided they implement their activity lifecycle correctly (see Activity for more details), the system can kill such processes at any time to reclaim memory for one of the three previous processes types. Usually there are many of these processes running, so they are kept in an LRU list to ensure the process that was most recently seen by the user is the last to be killed when running low on memory.

   5.An empty process is one that doesn't hold any active application components. The only reason to keep such a process around is as a cache to improve startup time the next time a component of its application needs to run. As such, the system will often kill these processes in order to balance overall system resources between these empty cached processes and the underlying kernel caches.

When deciding how to classify a process, the system picks the most important level of all the components currently active in the process. See the Activity, Service, and IntentReceiver documentation for more detail on how each of these components contribute to the overall lifecycle of a process. The documentation for each of these classes describes in more detail how they impact the overall lifecycle of their application.

Andriod 2D Graphics - Drawing Pad Sample

2010-07-11T05:38:00.000-07:00

In this aritcle shows how to use onDraw() method and create a simple drawing program. The only significant files are Draw activity and the DrawView. You should see a black screen and be able to draw on it with your finger.

This activity creates the DrawView and sets it as activity's main content. It also sets the borderless window.

MainActivity.java
public class MainActivity extends Activity {
    DrawView drawView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        drawView = new DrawView(this);
        setContentView(drawView);
        drawView.requestFocus();
    }

    // DrawView is a view. It listens to mouse click events and draws a point at the point that it was clicked on.
   public class DrawView extends View implements OnTouchListener {
        List<Point> points = new ArrayList<Point>();
        Paint paint = new Paint();
        public DrawView(Context context) {
        super(context);
        setFocusable(true);
        setFocusableInTouchMode(true);
        this.setOnTouchListener(this);
        paint.setColor(Color.WHITE);
        paint.setAntiAlias(true);
        }

    @Override
    public void onDraw(Canvas canvas) {
        for (Point point : points) {
            canvas.drawCircle(point.x, point.y, 5, paint);
        }
    }

    public boolean onTouch(View view, MotionEvent event) {
        Point point = new Point();
        point.x = event.getX();
        point.y = event.getY();
        points.add(point);
        invalidate();
        return true;
    }
}
    class Point {
        float x, y;
        @Override
        public String toString() {
        return x + ", " + y;
        }
    }
}

Custom ContextMenu using PopupWindow Sample

2010-07-11T04:59:00.000-07:00

Here we are creating a custom contextmenu using PopupWindow in android. A simple PopUpWindow can be created using the following steps.
   1)A layout XML which describes the View that will be rendered within a PopUpWindow has to be created.
   2)Invoke the PopUpWindow by inflating the layout XML, and assign appropriate “parent view” to the pop-up.

Popup_example.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:padding="10dip" android:layout_width="fill_parent"
android:layout_height="wrap_content" >
    <TextView android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:layout_marginTop="10dip" android:text="Test Pop-Up"/>
</LinearLayout>

Java Code:
    LayoutInflater inflater = (LayoutInflater)
    this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    PopupWindow pw = new PopupWindow(
    inflater.inflate(R.layout.popup_example, null, false), 100, 100,    true);
    // The code below assumes that the root container has an id called 'main'
    pw.showAtLocation(this.findViewById(R.id.main), Gravity.CENTER, 0, 0);

How to Dismiss the PopUp Window?

Declare the necessary variables:

         private PopupWindow Popup;
       //how much time your popup window should appear
        private static final int POPUP_DISMISS_DELAY = 4000
       private DismissPopup mDismissPopup = new DismissPopup();

Class for dismissing the PopUp Window
Create a class which helps in dismissing the window automatically after the specified time:
class DismissPopup implements Runnable {
public void run() {
      // Protect against null-pointer exceptions
      if (mPopup != null) {
          mPopup.dismiss();
      }
}
}

Code Snippet:
Popup = new PopupWindow(this.getViewInflate()
                  .inflate(R.layout.main1,null,null),0,0);
Popup.setOutsideTouchable(false);
Popup.setTouchInterceptor(new OnTouchListener() {

public boolean onTouch(View v, MotionEvent event) {
return false;
}});

Popup.showAtLocation(this.findViewById(R.id.main2),Gravity.BOTTOM, 20, 20);

youractivity.postDelayed(mDismissPopup, POPUP_DISMISS_DELAY);

2D graphics with Effects

2010-07-11T04:05:00.001-07:00

In this article help us to set the different type of effect in the drawable.

Effects

Shadow Effect
This draws a shadow layer below the main layer, with the specified offset and color, and blur radius.

MaskFilterEffect
MaskFilter is the base class for object that perform transformations on an alpha-channel mask before drawing it. A subclass of MaskFilter may be installed into a Paint. Blur and emboss are implemented as subclasses of MaskFilter.

Sample Implementation:
Blur Filter
paint.setMaskFilter(new BlurMaskFilter(15, Blur.INNER));
paint.setMaskFilter(new BlurMaskFilter(15, Blur.OUTER));
paint.setMaskFilter(new BlurMaskFilter(15, Blur.SOLID));
paint.setMaskFilter(new BlurMaskFilter(15, Blur.NORMAL));

Emboss Filter
paint.setMaskFilter(new EmbossMaskFilter(new float[] { 1, 1, 1 },0.4f, 10, 8.2f));

Shader Effect
Shader is the based class for objects that return horizontal spans of colors during drawing. A subclass of Shader is installed in a Paint calling paint.setShader(shader). After that any object (other than a bitmap) that is drawn with that paint will get its color(s) from the shader.

Shader Sample Implementation:
LinearGradient
paint.setShader(new LinearGradient(8f, 80f, 30f, 20f, Color.RED,Color.WHITE, Shader.TileMode.MIRROR));

RadialGradient
paint.setShader(new RadialGradient(8f, 80f, 90f, Color.RED,Color.WHITE, Shader.TileMode.MIRROR));

SweepGradient
paint.setShader(new SweepGradient(80, 80, Color.RED, Color.WHITE));

Sample Apps
Layout : main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">

<LinearLayout android:id="@+id/ImageView01" android:layout_height="150dip" android:layout_width="150dip"
android:layout_gravity="center"></LinearLayout>
<LinearLayout android:id="@+id/LinearLayout01" android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center">
<Button android:text="Draw Cicle" android:id="@+id/circle"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_width="85dip" android:gravity="center"></Button>
<Button android:text="Anti Alias" android:id="@+id/antialias"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_width="85dip" android:gravity="center"></Button>
<Button android:text="Shadow" android:id="@+id/shadow"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_width="85dip" android:gravity="center"></Button>
</LinearLayout>

<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center">
<Button android:text="Blur Effect - 1" android:id="@+id/blur1"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_width="85dip" android:gravity="center"></Button>
<Button android:text="Blur Effect - 2" android:id="@+id/blur2"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_width="85dip" android:gravity="center"></Button>
<Button android:text="Blur Effect - 3" android:id="@+id/blur3"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_width="85dip" android:gravity="center"></Button>
</LinearLayout>

<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center">
<Button android:text="Blur Effect - 4" android:id="@+id/blur4"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_width="85dip" android:gravity="center"></Button>
<Button android:text="Emboss" android:id="@+id/emboss"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_width="85dip" android:gravity="center"></Button>
</LinearLayout>

<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center">
<Button android:text="Sweep" android:id="@+id/sweep"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_width="85dip" android:gravity="center"></Button>
<Button android:text="Linear" android:id="@+id/linear"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_width="85dip" android:gravity="center"></Button>
<Button android:text="Radial" android:id="@+id/radial"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_width="85dip" android:gravity="center"></Button>
</LinearLayout>
</LinearLayout>

MainActivity.java

public class MainActivity extends Activity implements OnClickListener {

LinearLayout imageView;
Button circle, antialias, shadow, blur1, blur2, blur3, blur4, emboss,
sweep, radial, linear;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
imageView = (LinearLayout) findViewById(R.id.ImageView01);
circle = (Button) findViewById(R.id.circle);
antialias = (Button) findViewById(R.id.antialias);
shadow = (Button) findViewById(R.id.shadow);
blur1 = (Button) findViewById(R.id.blur1);
blur2 = (Button) findViewById(R.id.blur2);
blur3 = (Button) findViewById(R.id.blur3);
blur4 = (Button) findViewById(R.id.blur4);

emboss = (Button) findViewById(R.id.emboss);
sweep = (Button) findViewById(R.id.sweep);
linear = (Button) findViewById(R.id.linear);
radial = (Button) findViewById(R.id.radial);

circle.setOnClickListener(this);
antialias.setOnClickListener(this);
shadow.setOnClickListener(this);
blur1.setOnClickListener(this);
blur2.setOnClickListener(this);
blur3.setOnClickListener(this);
blur4.setOnClickListener(this);
emboss.setOnClickListener(this);
sweep.setOnClickListener(this);
linear.setOnClickListener(this);
radial.setOnClickListener(this);

}

@Override
public void onClick(View v) {
imageView.removeAllViews();
switch (v.getId()) {
case R.id.circle:
imageView.addView(new DrawView(MainActivity.this));
break;
case R.id.antialias:
imageView.addView(new DrawView(MainActivity.this).getAntiAlias());
break;
case R.id.shadow:
imageView
.addView(new DrawView(MainActivity.this).getShadowEffect());
break;
case R.id.blur1:
imageView.addView(new DrawView(MainActivity.this)
.getBlurMaskFitler(1));
break;
case R.id.blur2:
imageView.addView(new DrawView(MainActivity.this)
.getBlurMaskFitler(2));
break;
case R.id.blur3:
imageView.addView(new DrawView(MainActivity.this)
.getBlurMaskFitler(3));
break;

case R.id.blur4:
imageView.addView(new DrawView(MainActivity.this)
.getBlurMaskFitler(4));
break;
case R.id.emboss:
imageView.addView(new DrawView(MainActivity.this)
.getEmbossMaskFilter());
break;
case R.id.sweep:
imageView.addView(new DrawView(MainActivity.this)
.getSweepShaderEffect());
break;
case R.id.linear:
imageView.addView(new DrawView(MainActivity.this)
.getLinearShaderEffect());
break;
case R.id.radial:
imageView.addView(new DrawView(MainActivity.this)
.getRadialShaderEffect());
break;

}

}

public class DrawView extends View {
Paint paint = new Paint();
Context c;
final float xPos = 80, yPos = 80, radius = 40;

public DrawView(Context context) {
super(context);
c = context;
paint.setColor(Color.WHITE);
invalidate();
}

private View getAntiAlias() {

paint.setAntiAlias(true);
return this;
}

private View getShadowEffect() {
paint.setAntiAlias(true);
paint.setShadowLayer(10, 10, 5, Color.RED);
return this;
}

private View getBlurMaskFitler(int type) {
invalidate();
paint.setAntiAlias(true);
switch (type) {
case 1:
paint.setMaskFilter(new BlurMaskFilter(15, Blur.INNER));
break;
case 2:
paint.setMaskFilter(new BlurMaskFilter(15, Blur.OUTER));
break;
case 3:
paint.setMaskFilter(new BlurMaskFilter(15, Blur.SOLID));
break;
case 4:
paint.setMaskFilter(new BlurMaskFilter(15, Blur.NORMAL));
break;
}
return this;
}

private View getEmbossMaskFilter() {
paint.setAntiAlias(true);
paint.setMaskFilter(new EmbossMaskFilter(new float[] { 1, 1, 1 },
0.4f, 10, 8.2f));
return this;
}

private View getSweepShaderEffect() {
paint.setAntiAlias(true);
paint.setShader(new SweepGradient(80, 80, Color.RED, Color.WHITE));
return this;
}

private View getRadialShaderEffect() {
paint.setAntiAlias(true);
paint.setShader(new RadialGradient(8f, 80f, 90f, Color.RED,
Color.WHITE, Shader.TileMode.MIRROR));
return this;
}

private View getLinearShaderEffect() {
paint.setAntiAlias(true);
paint.setShader(new LinearGradient(8f, 80f, 30f, 20f, Color.RED,
Color.WHITE, Shader.TileMode.MIRROR));
return this;
}

@Override
public void onDraw(Canvas canvas) {
canvas.drawCircle(xPos, yPos, radius, paint);
}
}
}

Android 2D Graphics Example

2010-07-07T09:03:00.001-07:00

This example shows how to use onDraw() method and create a simple drawing program. The only significant files are Draw activity and the DrawView.

MainActivity.java
public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        DrawView drawView = new DrawView(this);
        setContentView(drawView);
        drawView.requestFocus();
    }
}

public class DrawView extends View {
    Paint paint = new Paint();
    Context c;
    public DrawView(Context context) {
        super(context);
        c= context;
        paint.setColor(Color.WHITE);
        paint.setAntiAlias(true);
    }

    @Override
   public void onDraw(Canvas canvas) {
            canvas.drawCircle(100, 100, 50, paint);
    }
}
}

Sample Handler Implementation

2010-06-26T23:03:00.001-07:00

Handler is a verry useful and powerful component in Android. Some special features of Handler are,

     If handler is created without any parameter, then it will be created in the same thread itself.
     We can pass data to handler using message

I have created the below sample application, which is using handler efficiently. Increment the count for one second.

So if we need to create a seperate thread for handler, first we need to create a thread and create the handler inside it.

MainActivity
public class MainActivity extends Activity {
    TextView tv;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv = (TextView) findViewById(R.id.TextView01);
        new Thread() {
            public void run() {
                int i = 0;
                while (i <= 100) {
                    try {
                        sleep(1000);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    messageHandler.sendMessage(Message
                            .obtain(messageHandler, i));
                    i++;
                }
            }
        }.start();
    }
    private Handler messageHandler = new Handler() {
        public void handleMessage(Message msg) {
            tv.setText(msg.what + "");
        }
    };
}

Main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
<TextView android:text="@+id/TextView01" android:id="@+id/TextView01"
    android:layout_width="wrap_content" android:layout_height="wrap_content"
    android:textSize="25dip" android:layout_gravity="center"
    android:layout_marginTop="150dip"></TextView>
</LinearLayout>

Sample Rating Bar Implementation

2010-06-08T08:37:00.001-07:00

A RatingBar is an extension of SeekBar and ProgressBar that shows a rating in stars.

The user can touch/drag or use arrow keys to set the rating when using the default size RatingBar.

The smaller RatingBar style and
the larger indicator-only style do not support user interaction and should only be used as indicators.

larger indicator-only    -    style="?android:attr/ratingBarStyleIndicator"
smaller RatingBar     -    style="?android:attr/ratingBarStyleSmall"
Default            -    style="?android:attr/ratingBarStyle"

Create a Circle in Andrind

2010-05-20T19:42:00.001-07:00

In this Ariticle helps to create a circle in andriod using

Create a Customized View Class
public class Ball extends View {}

Override the onDraw()
protected void onDraw(Canvas canvas) { }

Create Paint Object for draw the circle
mPaints1 = new Paint();
        mPaints2 = new Paint();
        mPaints1.setAntiAlias(true);
        mPaints1.setStyle(Paint.Style.FILL);

        mPaints2 = new Paint(mPaints1);
        mPaints2.setColor(Color.BLUE);
        mBigOval = new RectF(40, 10, 280, 250);

Draw Circle using drawArc
canvas.drawArc(oval, mStart, mSweep, useCenter, paint);

SourceCode

public class Ball extends View {

    private Paint mPaints2;
    private Paint mPaints1;
    private RectF mBigOval;
    private float mStart, mSweep;
    private int mBigIndex;

    public Ball(Context context) {
        super(context);

        mPaints1 = new Paint();
        mPaints2 = new Paint();
        mPaints1.setAntiAlias(true);
        mPaints1.setStyle(Paint.Style.FILL);

        mPaints2 = new Paint(mPaints1);
        mPaints2.setColor(Color.BLUE);
        mBigOval = new RectF(40, 10, 280, 250);
    }

    private void drawArcs(Canvas canvas, RectF oval, boolean useCenter,
            Paint paint) {
        canvas.drawArc(oval, mStart, mSweep, useCenter, paint);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        canvas.drawColor(Color.WHITE);
        drawArcs(canvas, mBigOval, true, mPaints2);
        mSweep += 2;
        if (mSweep > 360) {
            mStart += 10;
            if (mStart >= 360) {
                mStart -= 360;
            }
            mBigIndex = (mBigIndex + 1);
        }
        invalidate();
    }
}

Steps to create Andriod Widget

2010-05-10T04:14:00.001-07:00

In this article will help us to create customized Widget.

1. Create a Layout for Widget
2. Create Widget Class
3. Adding the Widget Provider Info Metadata
4. Register the Widget in Androidmanifest.xml
5. Add the Widget in your homepage

Create a Layout for Widget
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:background="@drawable/widget_bg">
    <Button android:text="Click" android:id="@+id/Button01"
        android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>

    <TextView android:id="@+id/text" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:text="@string/hello"
        android:gravity="center" android:textColor="@android:color/black" />
</LinearLayout>

Create Widget Class
public class Widget extends AppWidgetProvider {
    private SimpleDateFormat formatter = new SimpleDateFormat(
            "EEE, d MMM yyyy\nHH:mm:ss.SSS");

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager,
            int[] appWidgetIds) {

        String now = formatter.format(new Date());

        Intent intent = new Intent(context, MainActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,intent, 0);

        RemoteViews updateViews = new RemoteViews(context.getPackageName(),R.layout.main);
        updateViews.setTextViewText(R.id.text, now);
        appWidgetManager.updateAppWidget(appWidgetIds, updateViews);


        RemoteViews views = new RemoteViews(context.getPackageName(),R.layout.main);
        views.setOnClickPendingIntent(R.id.Button01, pendingIntent);
        appWidgetManager.updateAppWidget(appWidgetIds, views);

        super.onUpdate(context, appWidgetManager, appWidgetIds);

    }
}

Adding the Widget Provider Info Metadata

    <?xml version="1.0" encoding="utf-8"?>
    <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
        android:minWidth="166dip" android:minHeight="72dip" android:updatePeriodMillis="60000" android:initialLayout="@layout/main" />

Register the Widget in Androidmanifest.xml

    <receiver android:label="@string/widget_name" android:name=".Widget">
        <intent-filter>
            <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
        </intent-filter>
        <meta-data android:name="android.appwidget.provider" android:resource="@xml/widget" />
    </receiver>

Add the Widget in your homepage
    Click Menu -> Add -> Widget -> YOUR WIDGET

Andriond Interview Question -1

2010-05-09T09:59:00.000-07:00

Brief about the Android?
Andriod is a Operating System for device
It was initially developed by Android Inc., a firm later purchased by Google, and lately by the Open Handset Alliance.
It allows developers to write managed code in the Java language, controlling the device via Google-developed Java libraries.

Architecture of Android :
1. Linux Kernal [ 2.6 Kernal - security, memory management, process management, network stack, and driver model]
2. Native Libraries [SQLite, WEBKit, OpenGL,..]
3. Runtime + Dalvik VM [.dex format, Lightweight VM, Efficient Dalvik Bytecode]
4. Application Framework [Activity Manager, Content Manager, Location Manager, ]
5. Application [ System Apps and Your Apps]

Refer : http://about-android.blogspot.com/2009/11/architecture-of-android-1.html

What are the basic Components in Android?
Activities - An activity presents a visual user interface for one focused endeavor the user can undertake.
Services - A service doesn't have a visual user interface, but rather runs in the background for an indefinite period of time.
Broadcast receivers - A broadcast receiver is a component that does nothing but receive and react to broadcast announcements.
Content providers - A content provider makes a specific set of the application's data available to other applications.

http://about-android.blogspot.com/2009/11/application-fundamentals.html

what are the versions are avilable in android?
Version : 1.5 - Cupecake
Linux Version : 2.6.27
Offical release On : April 30th 2009
Main Feature :
* Ability to record and watch videos with the camcorder mode
* Uploading videos to YouTube and pictures to Picasa directly from the phone
* A new soft keyboard with an "Autocomplete" feature
* Bluetooth A2DP support and ability to automatically connect to a Bluetooth headset within a certain distance
* New widgets and folders that can populate the Home screens
* Animations between screens
* Expanded ability of Copy and paste to include web pages

Version : 1.6 - Donut
Linux Version : 2.6.29
Offical release On : April 30th 2009
Main Features :
* An improved Android Market experience.
* An integrated camera, camcorder, and gallery interface.
* Gallery now enables users to select multiple photos for deletion.
* Updated Voice Search, with faster response and deeper integration with native applications, including the ability to dial contacts.
* Updated search experience to allow searching bookmarks, history, contacts, and the web from the home screen.
* Updated Technology support for CDMA/EVDO, 802.1x, VPN, Gestures, and a Text-to-speech engine.
* Support for WVGA resolutions.
* Speed improvements for searching & the camera.[35]

Version : 2.0 & 2.1- Eclair
Linux Version : 2.6.29
Offical release On : October 26th 2009
Main Features :
* Optimized hardware speed
* Support for more screen sizes and resolutions
* Revamped UI
* New browser UI and HTML5 support
* New contact lists
* Better white/black ratio for backgrounds
* Improved Google Maps 3.1.2
* Microsoft Exchange support
* Built in flash support for Camera
* Digital Zoom
* MotionEvent class enhanced to track multi-touch events[41]
* Improved virtual keyboard
* Bluetooth 2.1
* Live Wallpapers

what is the folder structure of android?
1. src - It contain the java code
2. Resource - It contain the all resource with different floder
drawable - Icon
raw - Sounds
menu - Menu
values - Project Properties
layout - User interface Screens
3. gen - It contains the R.java file. You could not edit R.java manually. This have been generated automatically by understanding resource files etc.
4. AndroidManifest -It contains the Project properties
5. Android lib.

Refer :
http://about-android.blogspot.com/2009/11/application-fundamentals.html

what are the api available in the Android?
Activity Manager, WindowManager, Location Manager, View System, Notification Manager, Telephonic Manager, Package Manager,
Resource Manager,

Create Dynamic View Group

2010-05-07T05:14:00.001-07:00

In this Aricle help us to create a dynamic view group.

public class MainActivity extends Activity {
    Button btn, btn1;
    LayoutInflater linflater;
    LinearLayout l;
    static int pos = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn = (Button) findViewById(R.id.Button01);
        btn1 = (Button) findViewById(R.id.Button02);
        l = (LinearLayout) findViewById(R.id.LinearLayout01);
        linflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        btn.setOnClickListener(new myListener());
        btn1.setOnClickListener(new myListener1());
    }

    class myListener implements View.OnClickListener {
        @Override
        public void onClick(View v) {
            View myView = linflater.inflate(R.layout.dynamicoption, null);
            myView.setId(pos);
            pos++;
            l.addView(myView);
        }
    }

    class myListener1 implements View.OnClickListener {
        @Override
        public void onClick(View v) {
            if (pos != 0) {
                pos--;
                View myView = l.findViewById(pos);
                l.removeView(myView);
            }
        }
    }
}

main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    android:orientation="horizontal">

    <Button android:id="@+id/Button01" android:background="@drawable/plus"
        android:layout_height="45dip" android:layout_width="45dip"></Button>

    <Button android:id="@+id/Button02" android:background="@drawable/minus"
        android:layout_height="45dip" android:layout_width="45dip"></Button>

    <LinearLayout android:id="@+id/LinearLayout01"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:orientation="vertical"></LinearLayout>
</LinearLayout>

dynamicoption.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content" android:layout_height="wrap_content"
    android:orientation="horizontal">
    <EditText android:text="@+id/EditText01" android:id="@+id/EditText01"
        android:layout_width="wrap_content" android:layout_height="wrap_content"></EditText>
    <Button android:text="@+id/Button01" android:id="@+id/Button01"
        android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
</LinearLayout>

Icons
http://jmez.net/el/images/Minus.png
http://www.workingwithrails.com/images/plus.png?1213632569

Create Cutomized Color Picker in android

2010-04-19T22:21:00.001-07:00

Code snippet for customized color picker

1. Create a Customized Color picker dialog box
2. Call the ColorPicker Dialog

Create a Customized Color picker dialog box

copy the below code and place into your package.

public class ColorPickerDialog extends Dialog {

    public interface OnColorChangedListener {
        void colorChanged(int color);
    }

    private final OnColorChangedListener mListener;
    private final int mInitialColor;

    private static class ColorPickerView extends View {
        private final Paint mPaint;
        private final Paint mCenterPaint;
        private final int[] mColors;
        private final OnColorChangedListener mListener;

        ColorPickerView(Context c, OnColorChangedListener l, int color) {
            super(c);
            mListener = l;
            mColors = new int[] { 0xFFFF0000, 0xFFFF00FF, 0xFF0000FF,
                    0xFF00FFFF, 0xFF00FF00, 0xFFFFFF00, 0xFFFF0000 };
            Shader s = new SweepGradient(0, 0, mColors, null);

            mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            mPaint.setShader(s);
            mPaint.setStyle(Paint.Style.STROKE);
            mPaint.setStrokeWidth(32);

            mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            mCenterPaint.setColor(color);
            mCenterPaint.setStrokeWidth(5);
        }

        private boolean mTrackingCenter;
        private boolean mHighlightCenter;

        @Override
        protected void onDraw(Canvas canvas) {
            float r = CENTER_X - mPaint.getStrokeWidth() * 0.5f;

            canvas.translate(CENTER_X, CENTER_X);

            canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
            canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);

            if (mTrackingCenter) {
                int c = mCenterPaint.getColor();
                mCenterPaint.setStyle(Paint.Style.STROKE);

                if (mHighlightCenter) {
                    mCenterPaint.setAlpha(0xFF);
                } else {
                    mCenterPaint.setAlpha(0x80);
                }
                canvas.drawCircle(0, 0, CENTER_RADIUS
                        + mCenterPaint.getStrokeWidth(), mCenterPaint);

                mCenterPaint.setStyle(Paint.Style.FILL);
                mCenterPaint.setColor(c);
            }
        }

        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            setMeasuredDimension(CENTER_X * 2, CENTER_Y * 2);
        }

        private static final int CENTER_X = 100;
        private static final int CENTER_Y = 100;
        private static final int CENTER_RADIUS = 32;

        private int floatToByte(float x) {
            int n = java.lang.Math.round(x);
            return n;
        }

        private int pinToByte(int n) {
            if (n < 0) {
                n = 0;
            } else if (n > 255) {
                n = 255;
            }
            return n;
        }

        private int ave(int s, int d, float p) {
            return s + java.lang.Math.round(p * (d - s));
        }

        private int interpColor(int colors[], float unit) {
            if (unit <= 0)
                return colors[0];
            if (unit >= 1)
                return colors[colors.length - 1];

            float p = unit * (colors.length - 1);
            int i = (int) p;
            p -= i;

            // now p is just the fractional part [0...1) and i is the index
            int c0 = colors[i];
            int c1 = colors[i + 1];
            int a = ave(Color.alpha(c0), Color.alpha(c1), p);
            int r = ave(Color.red(c0), Color.red(c1), p);
            int g = ave(Color.green(c0), Color.green(c1), p);
            int b = ave(Color.blue(c0), Color.blue(c1), p);

            return Color.argb(a, r, g, b);
        }

        private int rotateColor(int color, float rad) {
            float deg = rad * 180 / 3.1415927f;
            int r = Color.red(color);
            int g = Color.green(color);
            int b = Color.blue(color);

            ColorMatrix cm = new ColorMatrix();
            ColorMatrix tmp = new ColorMatrix();

            cm.setRGB2YUV();
            tmp.setRotate(0, deg);
            cm.postConcat(tmp);
            tmp.setYUV2RGB();
            cm.postConcat(tmp);

            final float[] a = cm.getArray();

            int ir = floatToByte(a[0] * r + a[1] * g + a[2] * b);
            int ig = floatToByte(a[5] * r + a[6] * g + a[7] * b);
            int ib = floatToByte(a[10] * r + a[11] * g + a[12] * b);

            return Color.argb(Color.alpha(color), pinToByte(ir), pinToByte(ig),
                    pinToByte(ib));
        }

        private static final float PI = 3.1415926f;

        @Override
        public boolean onTouchEvent(MotionEvent event) {
            float x = event.getX() - CENTER_X;
            float y = event.getY() - CENTER_Y;
            boolean inCenter = java.lang.Math.sqrt(x * x + y * y) <= CENTER_RADIUS;

            switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                mTrackingCenter = inCenter;
                if (inCenter) {
                    mHighlightCenter = true;
                    invalidate();
                    break;
                }
            case MotionEvent.ACTION_MOVE:
                if (mTrackingCenter) {
                    if (mHighlightCenter != inCenter) {
                        mHighlightCenter = inCenter;
                        invalidate();
                    }
                } else {
                    float angle = (float) java.lang.Math.atan2(y, x);
                    // need to turn angle [-PI ... PI] into unit [0....1]
                    float unit = angle / (2 * PI);
                    if (unit < 0) {
                        unit += 1;
                    }
                    mCenterPaint.setColor(interpColor(mColors, unit));
                    invalidate();
                }
                break;
            case MotionEvent.ACTION_UP:
                if (mTrackingCenter) {
                    if (inCenter) {
                        mListener.colorChanged(mCenterPaint.getColor());
                    }
                    mTrackingCenter = false; // so we draw w/o halo
                    invalidate();
                }
                break;
            }
            return true;
        }
    }

    public ColorPickerDialog(Context context, OnColorChangedListener listener,
            int initialColor) {
        super(context);

        mListener = listener;
        mInitialColor = initialColor;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        OnColorChangedListener l = new OnColorChangedListener() {
            public void colorChanged(int color) {
                mListener.colorChanged(color);
                dismiss();
            }
        };

        LinearLayout layout = new LinearLayout(getContext());
        layout.setOrientation(LinearLayout.VERTICAL);
        layout.setGravity(Gravity.CENTER);
        layout.setPadding(10, 10, 10, 10);
        layout.addView(new ColorPickerView(getContext(), l, mInitialColor),
                new LinearLayout.LayoutParams(
                        LinearLayout.LayoutParams.WRAP_CONTENT,
                        LinearLayout.LayoutParams.WRAP_CONTENT));

        setContentView(layout);
        setTitle("Pick a Color");
    }
}

Call the ColorPicker Dialog
public class MainActivity extends Activity implements
        ColorPickerDialog.OnColorChangedListener {
    /** Called when the activity is first created. */
    private static final String BRIGHTNESS_PREFERENCE_KEY = "brightness";
    private static final String COLOR_PREFERENCE_KEY = "color";
    TextView tv;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv = (TextView) findViewById(R.id.TextView01);

        Button btn = (Button) findViewById(R.id.Button01);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int color = PreferenceManager.getDefaultSharedPreferences(
                        MainActivity.this).getInt(COLOR_PREFERENCE_KEY,
                        Color.WHITE);
                new ColorPickerDialog(MainActivity.this, MainActivity.this,
                        color).show();
            }
        });

    }

    @Override
    public void colorChanged(int color) {
        PreferenceManager.getDefaultSharedPreferences(this).edit().putInt(
                COLOR_PREFERENCE_KEY, color).commit();
        tv.setTextColor(color);

    }

}

main layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:id="@+id/mainview">
    <Button android:text="Select Color" android:id="@+id/Button01"
        android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
    <TextView android:text="@+id/TextView01" android:id="@+id/TextView01"
        android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
</LinearLayout>

Sample Apps to Control Screen Brightness

2010-04-19T21:42:00.001-07:00

This will help us to create a brightness controller in andriod.

1. Create a Layout with seekbar
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <Button android:text="Show Brightness Panel" android:id="@+id/Button01"
        android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>

    <LinearLayout android:id="@+id/panel" android:orientation="vertical"
        android:layout_width="fill_parent" android:layout_height="wrap_content"
        android:layout_alignParentBottom="true" android:paddingTop="10dip"
        android:paddingBottom="30dip" android:paddingLeft="20dip"
        android:paddingRight="20dip" android:gravity="center_horizontal"
        android:visibility="gone">

        <TextView android:text="Brightness Level"
            android:layout_width="fill_parent" android:layout_height="wrap_content"
            android:gravity="center" android:textAppearance="?android:attr/textAppearanceLarge" />

        <SeekBar android:id="@+id/seek" android:layout_width="fill_parent"
            android:layout_height="wrap_content" android:max="100"
            android:progress="100" />

    </LinearLayout>

</LinearLayout>

2. Create an activity to control the brightness
public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    private static final String BRIGHTNESS_PREFERENCE_KEY = "brightness";
    private View brightnessPanel;
    private SeekBar brightnessControl;
    private int brightness = 50;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        brightnessPanel = findViewById(R.id.panel);
        brightnessControl = (SeekBar) findViewById(R.id.seek);

        Button btn = (Button) findViewById(R.id.Button01);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showBrightnessPanel();

            }
        });

        brightnessControl
                .setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
                    public void onProgressChanged(SeekBar seekBar,
                            int progress, boolean fromUser) {
                        setBrightness(progress);
                    }

                    public void onStartTrackingTouch(SeekBar seekBar) {
                    }

                    public void onStopTrackingTouch(SeekBar seekBar) {
                        hideBrightnessPanel();
                    }
                });
    }

    private void showBrightnessPanel() {
        Animation animation = AnimationUtils.loadAnimation(this,
                android.R.anim.slide_in_left);
        brightnessControl.setProgress(this.brightness);
        brightnessPanel.setVisibility(View.VISIBLE);
        brightnessPanel.startAnimation(animation);
    }

    private void setBrightness(int value) {
        if (value < 10) {
            value = 10;
        } else if (value > 100) {
            value = 100;
        }
        brightness = value;
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.screenBrightness = (float) value / 100;
        lp.flags |= WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
        getWindow().setAttributes(lp);
    }

    private void hideBrightnessPanel() {
        Animation animation = AnimationUtils.loadAnimation(MainActivity.this,
                android.R.anim.slide_out_right);
        brightnessPanel.startAnimation(animation);
        brightnessPanel.setVisibility(View.GONE);
        PreferenceManager.getDefaultSharedPreferences(this).edit().putInt(
                BRIGHTNESS_PREFERENCE_KEY, brightnessControl.getProgress())
                .commit();
    }

}

Create a Apps to Show Digital Time in Android

2010-04-19T06:33:00.001-07:00

this blog helps to create a simple digital clock in andriod.

Create a Layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView android:id="@+id/countdown" android:layout_width="320dip"
        android:layout_height="120dip" android:text="00:00:00"
        android:textSize="15pt" android:textColor="#00C2FF"
        android:layout_centerInParent="true" />
</RelativeLayout>

Create Activty Class for show the Time

public class MainActivity extends Activity {
    private TextView countdown;
    private Timer timer;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView countdown = (TextView) findViewById(R.id.countdown);
    }

    @Override
    protected void onStart() {
        super.onStart();
        timer = new Timer("DigitalClock");
        Calendar calendar = Calendar.getInstance();

        // Get the Current Time
        final Runnable updateTask = new Runnable() {
            public void run() {
                countdown.setText(getCurrentTimeString()); // shows the current time of the day
//                countdown.setText(getReminingTime()); // shows the remaining time of the day
            }
        };

        // update the UI
        int msec = 999 - calendar.get(Calendar.MILLISECOND);
        timer.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                runOnUiThread(updateTask);
            }
        }, msec, 1000);
    }

    @Override
    protected void onStop() {
        super.onStop();
        timer.cancel();
        timer.purge();
        timer = null;
    }
   private String getReminingTime() {
        Calendar calendar = Calendar.getInstance();
        int hour = 23 - calendar.get(Calendar.HOUR_OF_DAY);
        int minute = 59 - calendar.get(Calendar.MINUTE);
        int second = 59 - calendar.get(Calendar.SECOND);
        return String.format("%02d:%02d:%02d", hour, minute, second);
    }

    private String getCurrentTimeString() {
        Calendar calendar = Calendar.getInstance();
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);
        int second = calendar.get(Calendar.SECOND);
        return String.format("%02d:%02d:%02d %02d", hour, minute, second);
    }
}

Creating dynamic Customized List view.

2010-04-19T03:13:00.001-07:00

This article shows to create a dynamic custom view as a list. i have created a custom adapter and explore to create a custom listview.
As a result i have created the below method. In this blog will help you to create a customized list view.

Create two layout
    1. main layout
    2. custom view layout.

MainLayout - which is used to define the scroll view.
    <?xml version="1.0" encoding="utf-8"?>
    <ScrollView android:id="@+id/ScrollView01"
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_height="fill_parent" android:layout_width="fill_parent">
        <LinearLayout android:orientation="vertical"
            android:layout_width="fill_parent" android:id="@+id/mylayout1"
            android:layout_height="wrap_content">
        </LinearLayout>
    </ScrollView>

Custom Layout - Which Consists of actual design.
    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout android:orientation="vertical"
        android:layout_width="fill_parent" android:layout_height="wrap_content"
        xmlns:android="http://schemas.android.com/apk/res/android">
        <TextView android:text="@+id/TextView01" android:id="@+id/TextView01"
            android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
        <Button android:text="@+id/Button01" android:id="@+id/Button01"
            android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
    </LinearLayout>

Create a Activity Class

public class DynamicListActivity extends Activity {
    /**
     * @see android.app.Activity#onCreate(Bundle)
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.listviewmain);
    LinearLayout l = (LinearLayout) findViewById(R.id.mylayout1);
    LayoutInflater linflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    for (int i = 0; i < 5; i++) {
        View customView = linflater.inflate(R.layout.customlistviewitem,
            null);
        TextView tv = (TextView) customView.findViewById(R.id.TextView01);
        Button btn = (Button) customView.findViewById(R.id.Button01);
        tv.setId(i);
        btn.setId(i);
        tv.setText("Location:" + i);
        btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(DynamicListActivity.this, v.getId() + "",
                Toast.LENGTH_LONG).show();
        }
        });
        l.addView(customView);
    }
    }
}

UtilMethod For Android - I

2010-04-19T02:00:00.001-07:00

I have collected some Utility method from my code.

/** Return a specific file contents as a String value. */
public static String getFileString(File file) throws Exception {
    String result = null;
    InputStream is = null;
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    try {
        is = new FileInputStream(file);
        int bytesRead;
        byte[] buffer = new byte[1024];
        while ((bytesRead = is.read(buffer)) != -1) {
            os.write(buffer, 0, bytesRead);
        }
        os.flush();
        result = new String(os.toByteArray());
    } catch(Exception e) {
        throw new Exception("Problem while reading file", e);
    } finally {
        try {
            os.close();
            is.close();
        } catch(Exception e) {
        }
    }
    return result;
}

/** Return a specific url contents as a String value. */
public static String getUrlString(String remoteUrl) throws Exception {
    String result = null;
    InputStream is = null;
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    try {
        URL url = new URL(remoteUrl);
        URLConnection connection = url.openConnection();
        connection.setConnectTimeout(5000);
        connection.setReadTimeout(5000);
        connection.connect();
        is = connection.getInputStream();
        int bytesRead;
        byte[] buffer = new byte[1024];
        while ((bytesRead = is.read(buffer)) != -1) {
            os.write(buffer, 0, bytesRead);
        }

        os.flush();
        result = new String(os.toByteArray());
    } catch(Exception e) {
        throw new Exception("Problem while reading targeted url", e);
    } finally {
        try {
            os.close();
            is.close();
        } catch(Exception e) {
        }
    }
    return result;
}

/** Create Thumbnail Image
* Param1 : Image,
* Param2 : Required Size */

public static Drawable createIconThumbnail(Drawable icon, int size) {
    int sourceWidth = icon.getIntrinsicWidth(),
    sourceHeight = icon.getIntrinsicHeight();

    int destWidth = size, destHeight = size;

    // only resize if actually needed
    if(sourceWidth != destWidth || sourceHeight != destHeight) {
        float ratio = (float) sourceWidth / sourceHeight;
        if(sourceWidth > sourceHeight) {
            destHeight = (int) (destWidth / ratio);
        } else if (sourceHeight > sourceWidth) {
            destWidth = (int) (destHeight * ratio);
        }

        final Bitmap thumb = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        final Canvas canvas = new Canvas(thumb);

        icon.setBounds((size - destWidth) / 2, (size - destHeight) / 2, destWidth, destHeight);
        icon.draw(canvas);
        icon = new BitmapDrawable(thumb);
    }
    return icon;
}

/** Return a current time a String value. */
private String getCurrentTimeString() {
        Calendar calendar = Calendar.getInstance();
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);
        int second = calendar.get(Calendar.SECOND);
        return String.format("%02d:%02d:%02d ", hour, minute, second);
    }

Create a Apps to Show Digital Time in Android

2010-04-18T18:27:00.000-07:00

this blog helps to create a simple digital clock in andriod.

Create a Layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView android:id="@+id/countdown" android:layout_width="320dip"
        android:layout_height="120dip" android:text="00:00:00"
        android:textSize="15pt" android:textColor="#00C2FF"
        android:layout_centerInParent="true" />
</RelativeLayout>

Create Activty Class for show the Time

public class MainActivity extends Activity {
    private TextView countdown;
    private Timer timer;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView countdown = (TextView) findViewById(R.id.countdown);
    }

    @Override
    protected void onStart() {
        super.onStart();
        timer = new Timer("DigitalClock");
        Calendar calendar = Calendar.getInstance();

        // Get the Current Time
        final Runnable updateTask = new Runnable() {
            public void run() {
                countdown.setText(getCurrentTimeString());
            }
        };

        // update the UI
        int msec = 999 - calendar.get(Calendar.MILLISECOND);
        timer.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                runOnUiThread(updateTask);
            }
        }, msec, 1000);
    }

    @Override
    protected void onStop() {
        super.onStop();
        timer.cancel();
        timer.purge();
        timer = null;
    }

    private String getCurrentTimeString() {
        Calendar calendar = Calendar.getInstance();
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);
        int second = calendar.get(Calendar.SECOND);
        return String.format("%02d:%02d:%02d %02d", hour, minute, second);
    }
}

UI component Snippets

2010-04-16T05:16:00.001-07:00

In this article having the set of android sinppets used to set the value and listener action.

Spinner Control

      String selectedState ="";
    String[] stateList = new String[] { "Select State", "MA", "NY" }; // Dropdown values
    Spinner sprState = (Spinner) findViewById(R.id.sprstate);

    // Set the value using the ArrayAdapter
    ArrayAdapter<String> stateListAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,stateList);
    stateListAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    stateListAdapter.setAdapter(stateList);

    // Listener
    sprState.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent,View view, int position, long id) {
        selectedState = String.valueOf(sprState.getSelectedItem());
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {
        }
    });

ListView Control

    ArrayList<String> tempListViewData = new ArrayList<String>();
   tempListViewData.add("One");
   tempListViewData.add("two");

   ListView l = (ListView) findViewById(R.id.ListView01);

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line, tempListViewData);
    l.setAdapter(adapter);

    l.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
            long arg3) {
        Log.d("Position", arg2 + "");
        }
    });

Button
Button btnFindStore = (Button) findViewById(R.id.btnhomego);
    private class FindStoreListener implements
            android.view.View.OnClickListener {
        @Override
        public void onClick(View v) {
       }
    }

btnCityStateOption.setOnClickListener(new FindStoreListener());

EditText
    EditText etUserInput = (EditText) findViewById(R.id.etuserinput);
    String.valueOf(etUserInput.getText()).trim();

Find Current Location in Android - GPS Sample

2010-04-15T06:36:00.000-07:00

This article will show you how to programmatically access the data returned by your built-in GPS receiver.

In Android, location-based services are provided by the LocationManager class located in the android.location package.

Using the LocationManager class, we can obtain periodic updates of the device's geographical locations as well as fire an intent when it enters the proximity of a certain location.

1. Obtain a reference to the LocationManager class using the getSystemService() method.
    LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

2. Create a LocationListener Class for notify the location changes.
Our MyLocationListener class should implements the LocationListener abstract class. There are four methods that you need to override in this implementation:
    * onLocationChanged(Location location): This method is called when the location has changed.
    * onProviderDisabled(String provider): This method is called when the provider is disabled by the user.
    * onProviderEnabled(String provider): This method is called when the provider is enabled by the user.
    * onStatusChanged(String provider, int status, Bundle extras): This method is called when the provider status changes.

3. To be notified whenever there is a change in location, you need to register for a request for changes in locations so that your program can be notified periodically. This is done via the requestLocationUpdates() method (see Listing 1).

This method takes in four parameters:
    * provider: The name of the provider with which you register
    * minTime: The minimum time interval for notifications, in milliseconds.
    * minDistance: The minimum distance interval for notifications, in meters.
    * listener: An object whose onLocationChanged() method will be called for each location update.

4. Set the following User-Permission in androidmanifest.xml
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>

Sample Code :
MainActivity.java
public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    LocationListener ll = new mylocationlistener();
    lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
    }

    private class mylocationlistener implements LocationListener {
    @Override
    public void onLocationChanged(Location location) {
        if (location != null) {
        Log.d("LOCATION CHANGED", location.getLatitude() + "");
        Log.d("LOCATION CHANGED", location.getLongitude() + "");
        Toast.makeText(MainActivity.this,
            location.getLatitude() + "" + location.getLongitude(),
            Toast.LENGTH_LONG).show();
        }
    }
    @Override
    public void onProviderDisabled(String provider) {
    }
    @Override
    public void onProviderEnabled(String provider) {
    }
    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }
    }
}

Steps to implement ExpandableListView in android

2010-04-07T03:08:00.001-07:00

3 Steps to implement the Expandable ListView in android

Step 1 : Initilize the ExpandableListView and ExpandableListAdapter in a onCreate()

    ExpandableListAdapter mAdapter;
    ExpandableListView epView = (ExpandableListView) findViewById(R.id.ExpandableListView01);
    mAdapter = new MyExpandableListAdapter();
    epView.setAdapter(mAdapter);

Step 2 : Create a custom BaseApdapter Class
/**
     * A simple adapter which maintains an ArrayList of photo resource Ids. Each
     * photo is displayed as an image. This adapter supports clearing the list
     * of photos and adding a new photo.
     *
     */
    public class MyExpandableListAdapter extends BaseExpandableListAdapter {
    // Sample data set. children[i] contains the children (String[]) for
    // groups[i].
    private String[] groups = { "Parent1", "Parent2",
        "Parent3" };
    private String[][] children = { { "Child1" },{ "Child2" }, { "Child3" },{ "Child4" }, { "Child5" } };

    public Object getChild(int groupPosition, int childPosition) {
        return children[groupPosition][childPosition];
    }

    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    public int getChildrenCount(int groupPosition) {
        int i = 0;
        try {
        i = children[groupPosition].length;

        } catch (Exception e) {
        }

        return i;
    }

    public TextView getGenericView() {
        // Layout parameters for the ExpandableListView
        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
            ViewGroup.LayoutParams.FILL_PARENT, 64);

        TextView textView = new TextView(MainActivity.this);
        textView.setLayoutParams(lp);
        // Center the text vertically
        textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        textView.setTextColor(R.color.marcyred);
        // Set the text starting position
        textView.setPadding(36, 0, 0, 0);
        return textView;
    }

    public View getChildView(int groupPosition, int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {
        TextView textView = getGenericView();
        textView.setText(getChild(groupPosition, childPosition).toString());
        return textView;
    }

    public Object getGroup(int groupPosition) {
        return groups[groupPosition];
    }

    public int getGroupCount() {
        return groups.length;
    }

    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {
        TextView textView = getGenericView();
        textView.setText(getGroup(groupPosition).toString());
        return textView;
    }

    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

    public boolean hasStableIds() {
        return true;
    }

    }

3. Listeners
    epView.setOnGroupClickListener(new OnGroupClickListener() {
        @Override
        public boolean onGroupClick(ExpandableListView arg0, View arg1,
            int groupPosition, long arg3) {
        if (groupPosition == 5) {

        }
        return false;
        }
        });

    epView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
    @Override
    public boolean onChildClick(ExpandableListView parent,
            View v, int groupPosition, int childPosition,
            long id) {
        if (groupPosition == 0 && childPosition == 0) {

        }
        return false;
    }
    });

Utility Calss - ImageMangerHelper

2010-04-06T23:54:00.000-07:00

The Following Code snippets used to fetching the image from targeted image URL

/**
* ImageManager is used to fetch the image from the targeted url. It is a
* immutable pattern.
*
* @author ganesan_sh
*
*/
public final class ImageManager {

    static ImageManager imageManager = null;
    private static long updatedTime = 0;
    private static long resetPeriod = 4320000;
    private static Bitmap bmImg;

    private ImageManager() {
    }

    public static ImageManager getImageManagerInstance(String imageURL) {
    long currTime = System.currentTimeMillis();
    if (((currTime - updatedTime) > resetPeriod) || imageManager == null) {
        imageManager = new ImageManager();
        fetchAdvBannerImage(imageURL);
    }
    return imageManager;
    }

    static void fetchAdvBannerImage(String fileUrl) {
    URL myFileUrl = null;
    try {
        myFileUrl = new URL(fileUrl);
    } catch (MalformedURLException e) {
    }
    try {
        HttpURLConnection conn = (HttpURLConnection) myFileUrl
            .openConnection();
        conn.setDoInput(true);
        conn.connect();
        int length = conn.getContentLength();
        InputStream is = conn.getInputStream();
        bmImg = BitmapFactory.decodeStream(is);

    } catch (IOException e) {
    }
    }

    public Bitmap getBannerImage() {
    return bmImg;
    }
}

Retrieve Application Names

2010-04-05T21:43:00.001-07:00

Here the following code snippet used to retrieve the installed package in your device

ListView programsList;
   PackageManager mPackageManager;

   programsList = (ListView) findViewById(R.id.ListView01);
    programsList.setTextFilterEnabled(true);
    mPackageManager = getPackageManager();
    List<String> packageName = new ArrayList<String>();
    List<ResolveInfo> list = mPackageManager.queryIntentActivities(
        new Intent(Intent.ACTION_MAIN), 0);
    for (ResolveInfo r : list) {
        packageName.add(r.loadLabel(mPackageManager).toString());
    }

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line,
    packageName);
    programsList.setAdapter(adapter);

Content Provider Example - 3

2010-04-01T03:22:00.001-07:00

Sample Code - MainActivity.java
public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button btn1 = (Button) findViewById(R.id.Button01);
        Button btn2 = (Button) findViewById(R.id.Button02);

        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ContentValues values = new ContentValues();
                values.put(UserInfo.isactive, "Y");
                Uri uri = getContentResolver().insert(MyContentProvider.CONTENT_URI, values);
                Toast.makeText(MainActivity.this, "Item Added",Toast.LENGTH_LONG).show();
            }
        });

        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String resultStr = "";
                Uri allTitles = Uri.parse("content://"+ MyContentProvider.PROVIDER_NAME + "/"+ UserInfo.DATABASE_TABLE);
                Cursor c = managedQuery(allTitles, null, null, null, "");
                if (c.moveToFirst()) {
                    do {
                        resultStr = c.getString(c.getColumnIndex(UserInfo._ID))+ ", "+ c.getString(c.getColumnIndex(UserInfo.isactive));
                        Toast.makeText(MainActivity.this, resultStr,Toast.LENGTH_LONG).show();
                    } while (c.moveToNext());
                }
            }
        });
    }

    public void readContact() {

        ArrayList<String> contactList;
        contactList = new ArrayList<String>();

        String[] columns = new String[] { People.NAME, People.NUMBER };
        Uri mContacts = People.CONTENT_URI;
        Cursor mCur = managedQuery(mContacts, columns, null, null, People.NAME+ " ASC ");
        if (mCur.moveToFirst()) {
            do {
                contactList.add(mCur.getString(mCur.getColumnIndex(People.NAME)));
            } while (mCur.moveToNext());
        }
        Toast.makeText(this, contactList.size() + "", Toast.LENGTH_LONG).show();
    }
}

-------------
MyContentProvider.java
public class MyContentProvider extends ContentProvider {
    public static final String PROVIDER_NAME = "com.contentproviderexample.mycontentprovider";
    public static final Uri CONTENT_URI = Uri.parse("content://"+ PROVIDER_NAME + "/demodb");
    private static final UriMatcher uriMatcher;
    private SQLiteDatabase demoDB;

    public static final class UserInfo implements BaseColumns {
        public static final String DATABASE_TABLE = "userinfo";
        public static final int USERINFO = 1;
        public static final int USERINFO_ID = 2;
        public static final Uri CONTENT_URI = Uri.parse("content://"+ PROVIDER_NAME + "/userinfo");
        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.contentproviderexample.userinfo";
        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.contentproviderexample.userinfo";
        public static final String _ID = "_id";
        public static final String isactive = "isactive";
    }

    static {
        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
        uriMatcher.addURI(PROVIDER_NAME, UserInfo.DATABASE_TABLE,UserInfo.USERINFO);
        uriMatcher.addURI(PROVIDER_NAME, UserInfo.DATABASE_TABLE + "/#",UserInfo.USERINFO);
    }

    @Override
    public boolean onCreate() {
        Context context = getContext();
        SQLiteConnectionManager dbHelper = new SQLiteConnectionManager(context);
        demoDB = dbHelper.getWritableDatabase();
        return (demoDB == null) ? false : true;
    }

    @Override
    public String getType(Uri uri) {
        switch (uriMatcher.match(uri)) {
        case UserInfo.USERINFO:
            return UserInfo.CONTENT_TYPE;
        case UserInfo.USERINFO_ID:
            return UserInfo.CONTENT_ITEM_TYPE;
        default:
            throw new IllegalArgumentException("Unsupported URI: " + uri);
        }
    }
    @Override
    public Uri insert(Uri uri, ContentValues values) {

        long rowID = demoDB.insert(UserInfo.DATABASE_TABLE, "", values);
        if (rowID > 0) {
            Uri _uri = ContentUris.withAppendedId(CONTENT_URI, rowID);
            getContext().getContentResolver().notifyChange(_uri, null);
            return _uri;
        }
        throw new SQLException("Failed to insert row into " + uri);
    }
    @Override
    public Cursor query(Uri uri, String[] projection, String selection,String[] selectionArgs, String sortOrder) {
        SQLiteQueryBuilder sqlBuilder = new SQLiteQueryBuilder();
        sqlBuilder.setTables(UserInfo.DATABASE_TABLE);
        if (uriMatcher.match(uri) == UserInfo.USERINFO_ID)
            sqlBuilder.appendWhere(UserInfo._ID + " = "+ uri.getPathSegments().get(1));
        Cursor c = sqlBuilder.query(demoDB, projection, selection,selectionArgs, null, null, sortOrder);
        c.setNotificationUri(getContext().getContentResolver(), uri);
        return c;
    }
    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        int count = 0;
        switch (uriMatcher.match(uri)) {
        case UserInfo.USERINFO:
            count = demoDB.delete(UserInfo.DATABASE_TABLE, selection,selectionArgs);
            break;

        case UserInfo.USERINFO_ID:
            String id = uri.getPathSegments().get(1);
            count = demoDB.delete(UserInfo.DATABASE_TABLE, UserInfo._ID+ " = "+ id+ (!TextUtils.isEmpty(selection) ? " AND (" + selection
                            + ')' : ""), selectionArgs);
            break;

            default:
                throw new IllegalArgumentException("Unknown URI " + uri);

        }
        getContext().getContentResolver().notifyChange(uri, null);
        return count;
    }
    @Override
    public int update(Uri uri, ContentValues values, String selection,String[] selectionArgs) {
        int count = 0;
        switch (uriMatcher.match(uri)) {
        case UserInfo.USERINFO:
            count = demoDB.update(UserInfo.DATABASE_TABLE, values, selection,selectionArgs);
            break;
        case UserInfo.USERINFO_ID:
            count = demoDB.update(UserInfo.DATABASE_TABLE, values, UserInfo._ID+ " = "+ uri.getPathSegments().get(1)
                    + (!TextUtils.isEmpty(selection) ? " AND (" + selection+ ')' : ""), selectionArgs);
            break;
        default:
            throw new IllegalArgumentException("Unknown URI " + uri);
        }
        getContext().getContentResolver().notifyChange(uri, null);
        return count;
    }
}
--------
SQLiteConnectionManager .java
public class SQLiteConnectionManager extends SQLiteOpenHelper {

    private static final String DATABASENAME = "DEMODB";
    private static final int DATABASE_VERSION = 1;
    private static final String CREATE_USERINFO = "CREATE TABLE userinfo(_id INTEGER NOT NULL CONSTRAINT USER_PK PRIMARY KEY AUTOINCREMENT,isactive TEXT DEFAULT 'Y')";
    public SQLiteConnectionManager(Context context) {
        super(context, DATABASENAME, null, DATABASE_VERSION);
    }
    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_USERINFO);
        Log.d("@G SQLConnectionFactory", " CREATE_LEADSOURCE Table ");
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    }
}

Content Provider Example - 2

2010-04-01T01:15:00.000-07:00

Implement the business login in the override methods.

    Using the onCreate Method we can initilze the Database
        @Override
        public boolean onCreate() {
            Context context = getContext();
            SQLiteConnectionManager dbHelper = new SQLiteConnectionManager(context);
            demoDB = dbHelper.getWritableDatabase();
            return (demoDB == null) ? false : true;
        }

    getType method is used to validate the input url
        @Override
        public String getType(Uri uri) {
            switch (uriMatcher.match(uri)) {
            case UserInfo.USERINFO:
                return UserInfo.CONTENT_TYPE;
            case UserInfo.USERINFO_ID:
                return UserInfo.CONTENT_ITEM_TYPE;
            default:
                throw new IllegalArgumentException("Unsupported URI: " + uri);
            }
        }

    CRUD Operation

    Create - insert()
        long rowID = demoDB.insert(UserInfo.DATABASE_TABLE, "", values);
        if (rowID > 0) {
            Uri _uri = ContentUris.withAppendedId(CONTENT_URI, rowID);
            getContext().getContentResolver().notifyChange(_uri, null);
            return _uri;
        }

    Retrive - query()

        SQLiteQueryBuilder sqlBuilder = new SQLiteQueryBuilder();
        sqlBuilder.setTables(UserInfo.DATABASE_TABLE);
        if (uriMatcher.match(uri) == UserInfo.USERINFO_ID)
            sqlBuilder.appendWhere(UserInfo._ID + " = "+ uri.getPathSegments().get(1));
        Cursor c = sqlBuilder.query(demoDB, projection, selection,selectionArgs, null, null, sortOrder);
        c.setNotificationUri(getContext().getContentResolver(), uri);

    Update - update()
        int count = 0;
        switch (uriMatcher.match(uri)) {
        case UserInfo.USERINFO:
            count = demoDB.update(UserInfo.DATABASE_TABLE, values, selection,selectionArgs);
            break;

        case UserInfo.USERINFO_ID:
            count = demoDB.update(UserInfo.DATABASE_TABLE, values, UserInfo._ID+ " = "+ uri.getPathSegments().get(1)
                    + (!TextUtils.isEmpty(selection) ? " AND (" + selection+ ')' : ""), selectionArgs);
            break;
        default:
            throw new IllegalArgumentException("Unknown URI " + uri);
        }
        getContext().getContentResolver().notifyChange(uri, null);

Delete - delete()
    int count = 0;
    switch (uriMatcher.match(uri)) {
        case UserInfo.USERINFO:
            count = demoDB.delete(UserInfo.DATABASE_TABLE, selection,selectionArgs);
            break;
        case UserInfo.USERINFO_ID:
            String id = uri.getPathSegments().get(1);
            count = demoDB.delete(UserInfo.DATABASE_TABLE, UserInfo._ID+ " = "+ id+ (!TextUtils.isEmpty(selection) ? " AND (" + selection+ ')' : ""), selectionArgs);
            break;
        default:
            throw new IllegalArgumentException("Unknown URI " + uri);
        }
        getContext().getContentResolver().notifyChange(uri, null);

Create a Database Helper to Create database Schema
Refer : http://about-android.blogspot.com/2009/12/android-hello-world-activity-sample.html

Accessing Our Content Provider
    Create or Insert
        ContentValues values = new ContentValues();
        values.put(UserInfo.isactive, "Y");
        Uri uri = getContentResolver().insert(MyContentProvider.CONTENT_URI, values);

    Retrieve
        String resultStr = "";
        Uri allTitles = Uri.parse("content://"+ MyContentProvider.PROVIDER_NAME + "/"+ UserInfo.DATABASE_TABLE);

        Cursor c = managedQuery(allTitles, null, null, null, "");
        if (c.moveToFirst()) {
            do {
                resultStr = c.getString(c.getColumnIndex(UserInfo._ID))+ ", "+ c.getString(c.getColumnIndex(UserInfo.isactive));
                Toast.makeText(MainActivity.this, resultStr,Toast.LENGTH_LONG).show();
            } while (c.moveToNext());
        }

Content Provider Example - 1

2010-04-01T00:27:00.001-07:00

In Android, a content provider is a specialized type of data store that exposes standardized ways to retrieve and manipulate the stored data.

You wish to share data between applications, you need to use the content provider model as recommended in Android. This article presents the basics of content providers and how you can implement one.

We are going to discuss following item here
1. Using a Content Provider
2. Create a Custom Content Provider

Using a Content Provider
Here are some of Android's most useful built-in content providers
Content Provider     Intended Data
Contacts                Contact details
Browser                 Browser bookmarks, browser history, etc.
CallLog                   Missed calls, call details, etc.
MediaStore             Media files such as audio, video and images
Settings                 Device settings and preferences

Here are the sample method for accessing the Contacts Content Provider.

public void readContact() {
        ArrayList<String> contactList;
        contactList = new ArrayList<String>();

        String[] columns = new String[] { People.NAME, People.NUMBER };
        Uri mContacts = People.CONTENT_URI;
        Cursor mCur = managedQuery(mContacts, columns, null, null, People.NAME+ " ASC ");
        if (mCur.moveToFirst()) {
            do {
                contactList.add(mCur.getString(mCur.getColumnIndex(People.NAME)));
            } while (mCur.moveToNext());
        }
        Toast.makeText(this, contactList.size() + "", Toast.LENGTH_LONG).show();
    }

Create a Custom Content Provider
1. Create a Content Provier Class
2. Override the Following Methods
3. Declare the Constant Content Provider Values.
4. Implement the business login in the override methods.
5. Create a Database Helper to Create database Schema
6. Accessing Our Content Provider

Create a Content Provier Class
    Create a customized class which extend the ContentProvider Class. ContentProvider is an abstract Class, so we need to override the method in the content provider class.
        public class MyContentProvider extends ContentProvider{}

Override the Following Methods

    * onCreate(): Called when the provider is being started.
    * getType(): Returns the MIME type of the data at the given URI.

    CRUD Operation
    * insert(): Inserts a new record into the content provider.
    * query(): Receives a request from a client. The result is returned as a Cursor object.
    * update(): Updates an existing record from the content provider.
    * delete(): Deletes an existing record from the content provider.



Declare the Constant Content Provider Values.

1. Provider Name - Which is used to access the content provider.
        1. Standard prefix indicating that the data is controlled by a content provider. IT'S NEVER MODIFIED.
        2.The authority part of the URI; it identifies the content provider. For third-party applications, this should be a fully-qualified class name (reduced to lowercase) to ensure uniqueness. The authority is declared in the <provider> element's authorities attribute:
            <provider name=".TransportationProvider" authorities="com.example.transportationprovider" . . >
        3. The path that the content provider uses to determine what kind of data is being requested. This can be zero or more segments long. If the content provider exposes only one type of data (only trains, for example), it can be absent. If the provider exposes several types, including subtypes, it can be several segments long for example, "land/bus", "land/train", "sea/ship", and "sea/submarine" to give four possibilities.
        4. The ID of the specific record being requested, if any. This is the _ID value of the requested record. If the request is not limited to a single record, this segment and the trailing slash are omitted:

Example
        public static final String PROVIDER_NAME = "com.contentproviderexample.mycontentprovider"; // Same as Androidmanifest.xml entry
        public static final Uri CONTENT_URI = Uri.parse("content://"+ PROVIDER_NAME + "/demodb"); // URI for access the Content Provider

2. Create a VO for Table with some content Provider Value
        For example i have create a table userinfo which contains the two column [id and isalive]. i have created the following VO class

public static final class UserInfo implements BaseColumns {
            public static final String DATABASE_TABLE = "userinfo";
            public static final int USERINFO = 1;
            public static final int USERINFO_ID = 2;

            public static final Uri CONTENT_URI = Uri.parse("content://"
                    + PROVIDER_NAME + "/userinfo");
            public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.contentproviderexample.userinfo";
            public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.contentproviderexample.userinfo";

            public static final String _ID = "_id";
            public static final String isactive = "isactive";
        }

3.Create a object for UriMatcher. and add the our URL with UriMatcher
        static {
        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
        uriMatcher.addURI(PROVIDER_NAME, UserInfo.DATABASE_TABLE,UserInfo.USERINFO);
        uriMatcher.addURI(PROVIDER_NAME, UserInfo.DATABASE_TABLE + "/#",UserInfo.USERINFO);
        }

Android Utility class - Activity navigation.

2010-03-31T21:48:00.000-07:00

ActivityHelper
In this article helps to create and use the utility class for activity navigation.

1. Create a normal class
    public class ActivityHelper { }

2. Define the utility method using the static factory method
    1. public static Intent createActivityIntent(Activity activity,Class preconditionActivityClazz) { } -used to create a intent
    2. public static void startOriginalActivityAndFinish(Activity preconditionActivity) { } - Return to the old activity
    3. public static void startNewActivityAndFinish(Activity activity,Intent intent) { } - Finish the current Activty and start a new activity.

3. Implementation
    Intent intent = ActivityHelper.createActivityIntent(MainActivity.this,TargetActivity.class);
    Using this intent we can navigate the screen
    startNewActivityAndFinish(intent); -> now the Activity moves to the TargetActivity and close the current activty.
    startOriginalActivityAndFinish(TargetActivity.this); - Return back to orginal activity.



Sample Code
public class ActivityHelper {
    static private final String EXTRA_WRAPPED_INTENT = "ActivityHelper_wrappedIntent";
    /**
    * Create a precondition activity intent.
    * @param activity the original activity
    * @param preconditionActivityClazz the precondition activity's class
    * @return an intent which will launch the precondition activity.
    */
    public static Intent createActivityIntent(Activity activity,
            Class preconditionActivityClazz) {
        Intent newIntent = new Intent();
        newIntent.setClass(activity, preconditionActivityClazz);
        newIntent.putExtra(EXTRA_WRAPPED_INTENT, activity.getIntent());
        return newIntent;
    }

    /**
    * Start the original activity, and finish the precondition activity.
    * @param preconditionActivity
    */
    public static void startOriginalActivityAndFinish(
            Activity preconditionActivity) {
        preconditionActivity.startActivity((Intent) preconditionActivity.getIntent().getParcelableExtra(EXTRA_WRAPPED_INTENT));
        preconditionActivity.finish();

    }

    /**
    * Start the precondition activity using a given intent, which should have
    * been created by calling createPreconditionIntent.
    * @param activity
    * @param intent
    */
    public static void startNewActivityAndFinish(Activity activity,
            Intent intent) {
        activity.startActivity(intent);
        activity.finish();
    }

}

Android Hudson Setup

2010-03-24T22:09:00.001-07:00

Not yet completed....

JUnit Setup For Android

2010-03-24T22:08:00.003-07:00

Here we are discuss about the JUnit implementation in android application
1. Overview of JUnit in Android
2. Create a Junit Enables Android Application
3. Create a Sample Testcase.

Oveview
The popular JUnit test framework is integrated into Android.
JUnit, if used properly, brings two major benefits to the test implementation.
    * JUnit enforces the hierarchical organization of the test cases
    * The pattern JUnit is based on guarantees the independence of the test cases and minimizes their interference.

Android test cases classes should inherit from android.test.AndroidTestCase instead of junit.framework.TestCase.
The main difference between the two is that AndroidTestCase knows about the Context object and provides method to obtain the current Context.
As many Android API methods need the Context object, this makes coding of Android test cases much easier.
Make a seperate folder for Junit test Class. Because it should be remove while move to production.

Steps to Implement the JUnit.
1. Create a project
2. Add uses-library and instrumentation in AndroidManifeast.xml
3. Create a StartupTestSuite
4. Create a Testcase class
5. Run the Apps

Create a Project
Create an android project using your IDE and create a basic component for the application. In this blog i have created a MainActivity which get the text based input from the user.
Requirement : User enter the His/Her name and password and submit the form.
I have created the following Layout.

Android CodeReview Tool Setup - PMD

2010-03-24T22:08:00.001-07:00

In this article help us to setup the Code Review tool for android.
Installing PMD
First, we need to install the PMD Eclipse plugin by following the instructions on the plugin page. Goto Help> Install New Software > Click Add

Add the link : http://pmd.sf.net/eclipse

Install the PMD for Eclipse 3

Configure PMD your project
1. In the project properties, select the PMD page. Enable PMD needs to be checked to run PMD automatically. Otherwise, you will need to manually start PMD each time you want to check your code using the PMD submenu and older violations will not be removed automatically once you fix your code, you will need to use the clear violations in the PMD submenu.

2. The “Handle high priority violations as errors” property needs to be unchecked. This is a new property in the 3.2.6 version of the PMD eclipse plugin. When that option is checked, the Android plugin will refuse to deploy your application if the project contains high level violations. So unless you have a development rule stating that there should be no high level violations in your project at any time, this option should be disabled.

3. With that setup, PMD will be enabled but it will be using the default ruleset shared by all projects in the workspace and that is not really adequate for Android development. To define a specific set of rules for your project, check the last box on the PMD page to create a file named “.ruleset” at the top level of your project. The configuration is now complete, press “OK” and then select “Yes” on the next popup.

4. Ensure the .ruleset and .pmd files has been created successfully.

5. Check the Code using the PMD
Select the Project and rightclick and select PMD > Check Code With PMD

6. check the Result in the Violations Overview.

SCM - SVN Setup for android

2010-03-24T22:06:00.001-07:00

My Setup for Google Android Development Environment

2010-03-24T09:04:00.000-07:00

Here we discussed my android environment. I have setup my android environment for various proces.
I belive the following items are esstential for project development and make easy our development.

Source Code Management Setup
Project Management Tool - Not Yet Done [As of now i am tracking milestone in a excel sheet]
Android Setup
Integrated development environment
Code Review With PMD
Testing - JUnit configuration.
Build Tool.

Source Code Management Setup

A managment process to record the data.

What benefits do Source Code Management tools provide?

SCM tools help development teams in many ways:
    * Collaboration: SCM tools prevent one user from accidentally overwriting the changes of another, allowing many developers to work on the same code without stepping one each other's toes.
    * History: SCM tools track the complete development history of the software, including the exact changes which have occurred between releases and who made those changes.
    * Release notes generation: Given the tracking of each change, the SCM can be used to generate notes for their software releases which accurately capture all of the changes included in the new release.
    * Documentation and test management: SCM tools can be used to manage not just software source code, but also test suites and documentation for their software.
    * Change notifications: To keep interested members of the team informed when changes occur to the source code.

Who uses SCM tools?
SCM tools are used by:
    * Project developers who are writing source code.
    * Project testers who need to download the very latest changes.
    * Advanced users who want to try out code that is not yet stable, mature or released.

What SCM tools does SourceForge.net support?
    * Subversion
    * Git
    * Mercurial
    * Bazaar
    * CVS

Subversion
A tool for software developers which supports collaborative development of software within a team, and the tracking of changes to software source code over time. Subversion is used by developers, and advanced users who need the very latest changes to the software (before releases occur).

Developers should familiarize themselves with Subversion by reading Version Control with Subversion.

Reference :
http://sourceforge.net/apps/trac/sourceforge/wiki/What%20is%20Source%20Code%20Management
http://sourceforge.net/apps/trac/sourceforge/wiki/Subversion

Click here[Setup SVN Environment] you can get more information.

Project Management Tool - Not Yet Done [As of now i am tracking milestone in a excel sheet]

Project management is the discipline of planning, organizing, and managing resources to bring about the successful completion of specific project goals and objectives. It is sometimes conflated with program management, however technically a program is actually a higher level construct: a group of related and somehow interdependent projects.

Android Setup
Check the Following blog to setup the android setup
Reference :
http://about-android.blogspot.com/2009/11/about-android-first-of-all-android_09.html

Integrated Development Environment
MOTODEV Studio is Motorola's robust IDE for developing exceptional mobile device applications for a wide range of Motorola products

You can download from : http://developer.motorola.com/docstools/motodevstudio/

Code Review With PMD
Code review is systematic examination (often as peer review) of computer source code intended to find and fix mistakes overlooked in the initial development phase, improving both the overall quality of software and the developers' skills.

Reference :
http://about-android.blogspot.com/2009/11/about-android-first-of-all-android_09.html

Testing - JUnit configuration.
In computer programming, unit testing is a software verification and validation method in which a programmer tests if individual units of source code are fit for use. A unit is the smallest testable part of an application. In procedural programming a unit may be an individual function or procedure.
Here we are using the Instrumentation Framework to write test cases.

Reference :
http://about-android.blogspot.com/2009/11/about-android-first-of-all-android_09.html

Build Tool.
In software engineering, continuous integration (CI) implements continuous processes of applying quality control - small pieces of effort, applied frequently. Continuous integration aims to improve the quality of software, and to reduce the time taken to deliver it, by replacing the traditional practice of applying quality control after completing all development.

Here we are discussing Hudson for continuous integration build

Reference :
http://about-android.blogspot.com/2009/11/about-android-first-of-all-android_09.html

Sample Google Map Driving Direction.

2010-03-22T04:16:00.001-07:00

1. Create a Customized Overlay Components.
2. Create a Map View Layout.
3. Get the Direction Data using the google Service.
4. Parse the Data and Generate geopoints
5. Draw the path using the customized Overlay Components

Create a Customized Overlay Components.
This components are used to draw the rount, which extends the overlay class.
Reference : http://about-android.blogspot.com/2010/03/steps-to-place-marker-in-map-overlay.html

Create a Map View Layout
Create a Map View and add create a mainactivity.
Reference :http://about-android.blogspot.com/2010/02/map-implementation.html

Get the Direction Data using the google Service
Google provides the varity of service to access the google map. In this blog we are using the following service to get the direction data.
http://maps.google.com/maps?f=d&hl=en&saddr=XXXXXXX&daddr=XXXXXXX&ie=UTF8&0&om=0&output=kml
Reference : http://mapki.com/wiki/Google_Map_Parameters

String urlString = "http://maps.google.com/maps?f=d&hl=en&saddr="+srcPlace+"&daddr="+destPlace+"&ie=UTF8&0&om=0&output=kml";
    HttpURLConnection urlConnection = null;
    URL url = null;
    String pathConent = "";
    try {
        url = new URL(urlString.toString());
        urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestMethod("GET");
        urlConnection.setDoOutput(true);
        urlConnection.setDoInput(true);
        urlConnection.connect();
        InoutStream is = urlConnection.getInputStream();
    } catch (Exception e) {
    }

Parse the Data and Generate geopoints
Here i am using the DOM Parser for parse the Content. You can use SAX parser.

Reference : http://about-android.blogspot.com/2010/02/sample-saxparser-in-android.html

Sample DOM Parser:
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = dbf.newDocumentBuilder();
    doc = db.parse(urlConnection.getInputStream());
    NodeList nl = doc.getElementsByTagName("LineString");
    for (int s = 0; s < nl.getLength(); s++) {
        Node rootNode = nl.item(s);
        NodeList configItems = rootNode.getChildNodes();
        for (int x = 0; x < configItems.getLength(); x++) {
            Node lineStringNode = configItems.item(x);
            NodeList path = lineStringNode.getChildNodes();
            pathConent = path.item(0).getNodeValue();
        }
    }

The following method is used to access the Url and parse content

private String[] getDirectionData(String srcPlace, String destPlace) {

    String urlString = "http://maps.google.com/maps?f=d&hl=en&saddr="
            + srcPlace + "&daddr=" + destPlace
            + "&ie=UTF8&0&om=0&output=kml";
    Log.d("URL", urlString);
    Document doc = null;
    HttpURLConnection urlConnection = null;
    URL url = null;
    String pathConent = "";
    try {

        url = new URL(urlString.toString());
        urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestMethod("GET");
        urlConnection.setDoOutput(true);
        urlConnection.setDoInput(true);
        urlConnection.connect();
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        doc = db.parse(urlConnection.getInputStream());

    } catch (Exception e) {
    }

    NodeList nl = doc.getElementsByTagName("LineString");
    for (int s = 0; s < nl.getLength(); s++) {
        Node rootNode = nl.item(s);
        NodeList configItems = rootNode.getChildNodes();
        for (int x = 0; x < configItems.getLength(); x++) {
            Node lineStringNode = configItems.item(x);
            NodeList path = lineStringNode.getChildNodes();
            pathConent = path.item(0).getNodeValue();
        }
    }
    String[] tempContent = pathConent.split(" ");
    return tempContent;
}

Draw the path using the customized Overlay Components
Using the Custom Overlay Component we can draw the line.

    // STARTING POINT
    GeoPoint startGP = new GeoPoint(
            (int) (Double.parseDouble(lngLat[1]) * 1E6), (int) (Double
                    .parseDouble(lngLat[0]) * 1E6));

    myMC = myMapView.getController();
    geoPoint = startGP;
    myMC.setCenter(geoPoint);
    myMC.setZoom(15);
    myMapView.getOverlays().add(new DirectionPathOverlay(startGP, startGP));

    // NAVIGATE THE PATH
    GeoPoint gp1;
    GeoPoint gp2 = startGP;

    for (int i = 1; i < pairs.length; i++) {
        lngLat = pairs[i].split(",");
        gp1 = gp2;
        // watch out! For GeoPoint, first:latitude, second:longitude
        gp2 = new GeoPoint((int) (Double.parseDouble(lngLat[1]) * 1E6),
                (int) (Double.parseDouble(lngLat[0]) * 1E6));
        myMapView.getOverlays().add(new DirectionPathOverlay(gp1, gp2));
        Log.d("xxx", "pair:" + pairs[i]);
    }

    // END POINT
    myMapView.getOverlays().add(new DirectionPathOverlay(gp2, gp2));

Sample Source

Custom Overlay Component : [DirectionPathOverlay.java]

public class DirectionPathOverlay extends Overlay {
    private GeoPoint gp1;
    private GeoPoint gp2;
    public DirectionPathOverlay(GeoPoint gp1, GeoPoint gp2) {
        this.gp1 = gp1;
        this.gp2 = gp2;
    }

    @Override
    public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
            long when) {
        // TODO Auto-generated method stub
        Projection projection = mapView.getProjection();
        if (shadow == false) {
            Paint paint = new Paint();
            paint.setAntiAlias(true);
            Point point = new Point();
            projection.toPixels(gp1, point);
            paint.setColor(Color.BLUE);
            Point point2 = new Point();
            projection.toPixels(gp2, point2);
            paint.setStrokeWidth(2);
            canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                    (float) point2.y, paint);
        }
        return super.draw(canvas, mapView, shadow, when);
    }

    @Override
    public void draw(Canvas canvas, MapView mapView, boolean shadow) {
        // TODO Auto-generated method stub

        super.draw(canvas, mapView, shadow);
    }

}

MainAcvity.java

public class MainActivity extends MapActivity {
    MapView myMapView = null;
    MapController myMC = null;
    GeoPoint geoPoint = null;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myMapView = (MapView) findViewById(R.id.mapid);
        geoPoint = null;
        myMapView.setSatellite(false);

        String pairs[] = getDirectionData("trichy", "thanjavur");
        String[] lngLat = pairs[0].split(",");

        // STARTING POINT
        GeoPoint startGP = new GeoPoint(
                (int) (Double.parseDouble(lngLat[1]) * 1E6), (int) (Double
                        .parseDouble(lngLat[0]) * 1E6));

        myMC = myMapView.getController();
        geoPoint = startGP;
        myMC.setCenter(geoPoint);
        myMC.setZoom(15);
        myMapView.getOverlays().add(new DirectionPathOverlay(startGP, startGP));

        // NAVIGATE THE PATH
        GeoPoint gp1;
        GeoPoint gp2 = startGP;

        for (int i = 1; i < pairs.length; i++) {
            lngLat = pairs[i].split(",");
            gp1 = gp2;
            // watch out! For GeoPoint, first:latitude, second:longitude
            gp2 = new GeoPoint((int) (Double.parseDouble(lngLat[1]) * 1E6),
                    (int) (Double.parseDouble(lngLat[0]) * 1E6));
            myMapView.getOverlays().add(new DirectionPathOverlay(gp1, gp2));
            Log.d("xxx", "pair:" + pairs[i]);
        }

        // END POINT
        myMapView.getOverlays().add(new DirectionPathOverlay(gp2, gp2));

        myMapView.getController().animateTo(startGP);
        myMapView.setBuiltInZoomControls(true);
        myMapView.displayZoomControls(true);

    }

    @Override
    protected boolean isRouteDisplayed() {
        // TODO Auto-generated method stub
        return false;
    }

    private String[] getDirectionData(String srcPlace, String destPlace) {

        String urlString = "http://maps.google.com/maps?f=d&hl=en&saddr="
                + srcPlace + "&daddr=" + destPlace
                + "&ie=UTF8&0&om=0&output=kml";
        Log.d("URL", urlString);
        Document doc = null;
        HttpURLConnection urlConnection = null;
        URL url = null;
        String pathConent = "";
        try {

            url = new URL(urlString.toString());
            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.setDoOutput(true);
            urlConnection.setDoInput(true);
            urlConnection.connect();
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            doc = db.parse(urlConnection.getInputStream());

        } catch (Exception e) {
        }

        NodeList nl = doc.getElementsByTagName("LineString");
        for (int s = 0; s < nl.getLength(); s++) {
            Node rootNode = nl.item(s);
            NodeList configItems = rootNode.getChildNodes();
            for (int x = 0; x < configItems.getLength(); x++) {
                Node lineStringNode = configItems.item(x);
                NodeList path = lineStringNode.getChildNodes();
                pathConent = path.item(0).getNodeValue();
            }
        }
        String[] tempContent = pathConent.split(" ");
        return tempContent;
    }

}

Create a Custom ListView

2010-03-17T22:15:00.001-07:00

This blog helps to create a custom list view.

Steps to create a Custom List View

1. Create Layout for your listview

2. Create a class which extend the ArrayAdapter

3. Assign the Values to View.

4. Implement the Custom Adapter in the mainactivity

Create Layout for your listview

This layout are used to show the listview as a each view. You can add the multiple view in that. In this example i have added only one textview and change the property.

Sample layout [customlistview.xml]

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:background="#FF04FF" android:layout_width="fill_parent"

android:layout_height="wrap_content">

<TextView android:text="@+id/TextView01" android:id="@+id/TextView01"

android:textColor="#FFFFFF" android:textSize="25px"

android:layout_height="fill_parent" android:layout_width="fill_parent"></TextView>

</LinearLayout>

Create a class which extend the ArrayAdapter & Assign the Values to View.

This class should extend the ArrayAdapter.
Create a parametrized constructor which pass the Context Object, CustomLayout ID as a integer value and Items as a arraylist.
Override getView() and assign the values in that.

Sample Custom Array Adapter Class [as a class member of mainactivity]

private class OrderAdapter extends ArrayAdapter<Order> {

private ArrayList<Order> items;

public OrderAdapter(Context context, int resource, ArrayList<Order> items) {

super(context, resource, items);

this.items = items;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

View v = convertView;

if (v == null) {

LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

v = vi.inflate(R.layout.customlistview, null);

}

Order o = items.get(position);

if (o != null) {

TextView tt = (TextView) v.findViewById(R.id.TextView01);

if (tt != null) {

tt.setText("Name: " + o.getTitleName());

}

return v;

}

Implement the Custom Adapter in the mainactivity

Create a Instance for the custom Adapater class and ArrayList

OrderAdapter customAdapter;

ArrayList<Order> orderList;

get the List of Items

orderList = new ArrayList<Order>();

orderList.add(new Order("first"));

orderList.add(new Order("second"));

orderList.add(new Order("third"));

customAdapter = new OrderAdapter(this, R.layout.customlistview,

orderList);

ListView l = (ListView) findViewById(R.id.ListView01);

l.setAdapter(customAdapter);

Sample Source

MainActivity.java

public class MainActivity extends Activity {

/** Called when the activity is first created. */

OrderAdapter customAdapter;

ArrayList<Order> orderList;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

orderList = new ArrayList<Order>();

orderList.add(new Order("first"));

orderList.add(new Order("second"));

orderList.add(new Order("third"));

customAdapter = new OrderAdapter(this, R.layout.customlistview,

orderList);

ListView l = (ListView) findViewById(R.id.ListView01);

l.setAdapter(customAdapter);

}

private class OrderAdapter extends ArrayAdapter<Order> {

private ArrayList<Order> items;

public OrderAdapter(Context context, int resource,

ArrayList<Order> items) {

super(context, resource, items);

this.items = items;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

View v = convertView;

if (v == null) {

LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

v = vi.inflate(R.layout.customlistview, null);

}

Order o = items.get(position);

if (o != null) {

TextView tt = (TextView) v.findViewById(R.id.TextView01);

if (tt != null) {

tt.setText("Name: " + o.getTitleName());

}

return v;

}

Order.java

public class Order {

public Order(String titleName) {

this.titleName = titleName;

}

private String titleName;

public String getTitleName() {

return titleName;

}

public void setTitleName(String titleName) {

this.titleName = titleName;

}

main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical" android:layout_width="fill_parent"

android:layout_height="fill_parent">

<TextView android:layout_width="fill_parent"

android:layout_height="wrap_content" android:text="@string/hello" />

<ListView android:id="@+id/ListView01" android:layout_height="fill_parent"

android:layout_width="fill_parent"></ListView>

</LinearLayout>

customlistview.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:background="#FF04FF" android:layout_width="fill_parent"

android:layout_height="wrap_content">

<TextView android:text="@+id/TextView01" android:id="@+id/TextView01"

android:textColor="#FFFFFF" android:textSize="25px"

android:layout_height="fill_parent" android:layout_width="fill_parent"></TextView>

</LinearLayout>

Steps to place the Marker in the Map [Overlay Example]

2010-03-16T04:18:00.000-07:00

In this ariticle used to place the marker in the map view.
1. Create a Customize Marker Class
Class Should Extend the ItemizedOverlay
Create a parameterized Constructor. i am trying with two constructor.
    The constructor must define the default marker for each of the OverlayItems. In order for the Drawable to actually get drawn, it must have its bounds defined.

    Most commonly, you want the center-point at the bottom of the image to be the point at which it's attached to the map coordinates. This is handled for you with the boundCenterBottom() method. Wrap this around our defaultMarker, so the super constructor call looks like this:

    public HelloItemizedOverlay(Drawable defaultMarker) {
    super(boundCenterBottom(defaultMarker));
    }

    public HelloItemizedOverlay(Drawable defaultMarker, Context context) {
    super(defaultMarker);
    mContext = context;
    }

2. Create the following class members
    1. private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
        Used to put each of the OverlayItem objects we want on the map.
    2. private Context mContext ;

    3. In order to add new OverlayItems to the ArrayList, you need a new method:

        public void addOverlay(OverlayItem overlay) {
            mOverlays.add(overlay);
            populate();
        }

        Now define the HelloItemizedOverlay constructors. The constructor must define the default marker for each of the OverlayItems. In order for the Drawable to actually get drawn, it must have its bounds defined.

3. Override the following methods

@Override
protected OverlayItem createItem(int i) {
return mOverlays.get(i);
}

@Override
public int size() {
return mOverlays.size();
}

@Override
protected boolean onTap(int index) {
    OverlayItem item = mOverlays.get(index);
    AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
    dialog.setTitle(item.getTitle());
    dialog.setMessage(item.getSnippet());
    dialog.setPositiveButton("Yes", new OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
        }
    });
    dialog.show();
    return true;
}

4. Implement the Marker in the map activity
    1. Get the Overlay as a list from mapview
        List<Overlay> mapOverlays = myMapView.getOverlays()

    2. Instantiate the following class
        Drawable with marker icon
            Drawable drawable = this.getResources().getDrawable(R.drawable.pinicon);

        Marker with Drawable object
            MyMapMarker itemizedoverlay = new MyMapMarker(drawable,this);

        OverlayItem with geopoint
            OverlayItem overlayitem = new OverlayItem(geoPoint, "Info",
                    "Selected City is" + city);

    3. All that's left is to add this OverlayItem to your collection, then add the MainActivity to the MapView:
        itemizedoverlay.addOverlay(overlayitem);
        mapOverlays.add(itemizedoverlay);

Sample Source

public class MyMapMarker extends ItemizedOverlay {

    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
    private Context mContext;


    public MyMapMarker(Drawable defaultMarker) {
        super(boundCenterBottom(defaultMarker));
        // TODO Auto-generated constructor stub
    }

    public MyMapMarker(Drawable defaultMarker, Context context) {
        this(defaultMarker);
        mContext = context;
    }

    public void addOverlay(OverlayItem item) {
        mOverlays.add(item);
        populate();

    }

    @Override
    protected OverlayItem createItem(int i) {
        return mOverlays.get(i);
    }
    @Override
    public int size() {
        return mOverlays.size();
    }
    @Override
    protected boolean onTap(int index) {
        OverlayItem item = mOverlays.get(index);
        AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
        dialog.setTitle(item.getTitle());
        dialog.setMessage(item.getSnippet());
        dialog.setPositiveButton("Yes", new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        dialog.show();
        return true;
    }
}

Androind JSON Parser

2010-03-12T10:47:00.000-08:00

In this blog explain the steps to parse JSON object in android. We are discuss the following items
Overview of JSON
Syntax of JSON
Android JSON Support
Steps to Parse JSON data
Sample Application

Overview of JSON [JavaScript Object Notation]
    Lightweight data-interchagable format
    Text format that is completely language independent


JSON is built on two structures:

    * A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.

    * An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence.

Syntax of JSON
Object {name1 : Value1 , name2 : Value2 , name3 : Value3 } -Normal Object Collection

Object [{name1_1 : Value , name1_2 : Value1 , name1_3 : Value2 }
    {name2_1 : Value , name2_2 : Value1 , name2_3 : Value2 } ] - Array Based

Example :
{"menu": {
    "id": "file",
    "value": "File",
    "popup": {
        "menuitem": [
          {"value": "New", "onclick": "CreateNewDoc()"},
          {"value": "Open", "onclick": "OpenDoc()"},
          {"value": "Close", "onclick": "CloseDoc()"}
        ]
    }
}}

Android JSON Support
    Android already contains the required JSON libraries. The Following class are used to parse the JSON Object.

    JSONArray         A JSONArray is an ordered sequence of values.
    JSONObject    A JSONObject is an unordered collection of name/value pairs.
    JSONStringer     JSONStringer provides a quick and convenient way of producing JSON text.
    JSONTokener     A JSONTokener takes a source string and extracts characters and tokens from it.

Steps to Parse JSON data
1. Create a JSON Object and Convert JSONString to JSON Object
    JSONObject jObject = new JSONObject(jsonString);

2. Create a Key based JSONObject.
    JSONObject menuObject = jObject.getJSONObject("menu");

3. Get the Value
    Log.d("ID", menuObject.getString("id"));
    Log.d("Value ", menuObject.getString("value"));

Sample Application

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        String myJsonContent = "{\"menu\": {\"id\": \"file\",\"value\": \"File\",\"popup\": {\"menuitem\": [{\"value\": \"New\", \"onclick\": \"CreateNewDoc()\"},{\"value\": \"Open\",\"onclick\": \"OpenDoc()\"},{\"value\": \"Close\", \"onclick\": \"CloseDoc()\"}]}}}";
        sampleJsonParser(myJsonContent);
    }

    public void sampleJsonParser(String jsonString) {
        try {
            JSONObject jObject = new JSONObject(jsonString);
            JSONObject menuObject = jObject.getJSONObject("menu");
            Log.d("ID", menuObject.getString("id"));
            Log.d("Value ", menuObject.getString("value"));
            JSONObject popupObject = menuObject.getJSONObject("popup");
            JSONArray menuitemArray = popupObject.getJSONArray("menuitem");
            for (int i = 0; i < 3; i++) {
                Log.d("Name", menuitemArray.getJSONObject(i).getString("value")
                        .toString());
                Log.d("Value", menuitemArray.getJSONObject(i).getString(
                        "onclick").toString());
            }
       } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

Some Activity Style

2010-03-12T10:12:00.000-08:00

In this article discuss some activity sytle
1. Create Title-less Activity
2. Create a Full Screen Activity

Create Title-less Activity
We can remove the title bar for every activity. The Following method used to remove the title. this method must be call before the setContentView().
requestWindowFeature(Window.FEATURE_NO_TITLE);

Sample SourceCode
public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);
    }
}

Create a Full Screen Activity
We can hide the title bar and windows bar. The following lines are used to hide the title and window bar

Sample SourceCode
public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.main);
        Toast.makeText(this, "Welcome to Application", Toast.LENGTH_LONG)
                .show();
    }
}
Android - disable landscape mode - Disable screen Orientation
the following code shows how to disable the screen orientation in android

Add android:screenOrientation="portrait" to the activity in the AndroidManifest.xml. For example:
        <activity android:name=".MainActivity"
              android:label="@string/app_name"
              android:screenOrientation="portrait">

Lanuch Application as Startup Application

2010-03-12T09:44:00.000-08:00

In this article helps to lanuch your activity after the start your Phone.
1. Create a BroadcastReceiver Class and start your Main Activity
2. Set the User Permission for launch your application
3. Configure the Action and catgory in the intent-filter
4. Create a MainActivity

Create a BroadcastReceiver Class and start your Main Activity
    This BroadcastReceiver is used to receive the action and start the your main activity

public class StartupActivity extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
   }
}

Set the User Permission for launch your application
Config the " android.permission.RECEIVE_BOOT_COMPLETED " User Permission in the androidmanifest.xml

Configure the Action and catgory in the intent-filter
Set the following values for android and category

Action         :    android.intent.action.BOOT_COMPLETED
Category     :    android.intent.category.DEFAULT

Create a MainActivity
Create a MainActivity and write your logic there
public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        }
}

Sample Code
MainActivity.java
public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Toast.makeText(this, "Welcome to Application", Toast.LENGTH_LONG)
                .show();
        finish();
    }
}

BroadcastReceiver.java
public class StartupActivity extends BroadcastReceiver {
    /**
    * @see android.content.BroadcastReceiver#onReceive(Context,Intent)
    */
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent i = new Intent(context, MainActivity.class);
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);
    }
}

Androidmanifest.xml
<?xml version="1.0" encoding="UTF-8"?>
<manifest android:versionCode="1" android:versionName="1.0"
    package="com.lanuchactivity" xmlns:android="http://schemas.android.com/apk/res/android">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:label="@string/app_name" android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".StartupActivity">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"></action>
                <category android:name="android.intent.category.DEFAULT"></category>
            </intent-filter>
        </receiver>
    </application>
    <uses-sdk android:minSdkVersion="7" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
</manifest>

Http client API Post method implementation:

2010-02-26T02:36:00.000-08:00

Android client side
1.create simple activity with edit text.
public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        httpHelper = new HttpHelper();
        etContents =(EditText) findViewById(R.id.etContents);
    }

2.Create Name Value Pair add parameters user name and password.

List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
            nameValuePairs.add(new BasicNameValuePair("userName", "nava"));
            nameValuePairs.add(new BasicNameValuePair("password", "nav"));
            HttpResponse response = httpHelper.doPost("URLHERE", nameValuePairs);


3.Create http post method and set header and entity. Create Default Http Client,Http Context and execute the http request.

DefaultHttpClient httpClient;
HttpContext localContext;
HttpPost request = new HttpPost(url);
        HttpResponse response = null;
        Log.d("Service Call ",url);
        try {
            // Set parameters
            if (parameters != null) {
                request.setHeader("Content-Type", "application/x-www-form-urlencoded");
                request.setEntity(new UrlEncodedFormEntity(parameters));
            }
            response = httpClient.execute(request, localContext);


        } catch (ClientProtocolException e) {
            // put your code here
        } catch (IOException e) {
            // put your code here
        }
4.Get the response from the server and display the content to edit text

try {
                InputStream instream = response.getEntity().getContent();
                content = httpHelper.inconvertibility(instream);
                etContents.setText(content);
            } catch (IllegalStateException e1) {
                e1.printStackTrace();
            } catch (IOException e1) {
                e1.printStackTrace();
            }

Server side implementation:

1.create simple web application and that application receive the request parameter.

public void crmLogin(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
        String userName = "";
        String password = "";

        String result = "";


        if (request.getParameter("userName") != null) {
            userName = request.getParameter("userName");
        }

        if (request.getParameter("password") != null) {
            password = request.getParameter("password");
        }
2.get the user name and password from the request and set the user name and password to response.

result="userNamee="+userName+""+"password="+password;

        response.setContentType("text/plain");
        response.setHeader("Cache-Control", "no-cache");
        try {
            response.getWriter().write(result);
        } catch (Exception e) {
        }

Sample SAXParser in Android

2010-02-26T02:13:00.000-08:00

In this aritcle discuss about “How to properly parse XML using a SAXParser”.

1.Create a Customized Handler based on the XML
2.Create a ParserHelper Class
3.Implement the parser and get the Data.

Create a Customized Handler based on the XML
You can create customized handler using the DefaultHandler class for your xml.

Step : 1 [Create a Handler which extends DefaultHandler]
    class MyDefaultHandler extends DefaultHandler {
    }

Step : 2 [ Override the Methods and implement the Code]

    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
    }

    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        _tmpValue = new String(ch, start, length);
    }

    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        if (localName.equalsIgnoreCase("uname")) {
            _tmpKey = _tmpValue;
        } else if (localName.equalsIgnoreCase("pwd")) {
            userList.put(_tmpKey.trim(), _tmpValue);
        }
    }

Create a ParserHelper Class
Create an instance for customized handler class
    MyDefaultHandler df = new MyDefaultHandler();

Create an instance for SAXParserFactory,SAXParser and XMLReader
    SAXParserFactory spf = SAXParserFactory.newInstance();
    SAXParser sp = spf.newSAXParser();
    XMLReader xr = sp.getXMLReader();

Set the content Handler
    xr.setContentHandler(df);

Set the XML Content
Type 1:
    InputSource is = new InputSource();
    is.setCharacterStream(new StringReader(parseContent));

Type 2:
    URL url = new     URL("http://www.DOMAON.com/File.xmll");


Parser the XML
    xr.parse(is); [For type1]
    xr.parse(new InputSource(url.openStream())); [For type2]

Implement the parser and get the Data

Create an instance for helper class and call the parserContent method

    SAXHelper sh = new SAXHelper();
    sh.parseContent(content);

Sample Source

MyDefaultHandler.java

class MyDefaultHandler extends DefaultHandler {

    String _tmpValue = "", _tmpKey = "";
    public HashMap<String, String> userList = new HashMap<String, String>();

    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
    }

    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        _tmpValue = new String(ch, start, length);
    }

    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        if (localName.equalsIgnoreCase("uname")) {
            _tmpKey = _tmpValue;
        } else if (localName.equalsIgnoreCase("pwd")) {
            userList.put(_tmpKey.trim(), _tmpValue);
        }
    }
}

SAXHelper.java
public class SAXHelper {
    public HashMap<String, String> userList = new HashMap<String, String>();
    public void parseContent(String parseContent) {
        MyDefaultHandler df = new MyDefaultHandler();
        try {
            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            XMLReader xr = sp.getXMLReader();
            xr.setContentHandler(df);
            InputSource is = new InputSource();
            is.setCharacterStream(new StringReader(parseContent));
            xr.parse(is);
            userList = df.userList;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Implementation Class

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        String content = "<root><uname>ganesan</uname><pwd>pwd2</pwd> <uname>rama</uname><pwd>pwd1</pwd> </root>";
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView tv = (TextView) findViewById(R.id.TextView01);
        SAXHelper sh = new SAXHelper();
        sh.parseContent(content);
        String data = (String) sh.userList.get("ganesan");
        Log.d("DATA", data);
        tv.setText(data);

    }
}

Steps to create a Sample TextToSpeech

2010-02-23T19:07:00.000-08:00

The following steps to help you create a Sample TextToSpeech(TTS) Application

1. Create a MainActivity which is extends Activity and Implements OnInitListener interface
2. Check the Text Speech Feature using the " TextToSpeech.Engine.ACTION_CHECK_TTS_DATA " or Install the Feature. Ensure your API 1.6 or greater than the 1.6
Because starting with Android 1.6 (API Level 4), the Android platform includes a new Text-to-Speech (TTS) capability. Also known as "speech synthesis", TTS enables your Android device to "speak" text of different languages.
3. Create TextToSpeech instance or installed the TextToSpeech API and create instance.
4. Configure with locale Implementation
5. Call the speak() to test the TTS

Create a MainActivity which is extends Activity and Implements OnInitListener interface
public class MainActivity extends Activity implements OnInitListener {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        }
        @Override
    public void onInit(int status) {
    }
}

2. Check the Text Speech Feature using the " TextToSpeech.Engine.ACTION_CHECK_TTS_DATA " or Install the Feature. Ensure your API 1.6 or greater than the 1.6
Because starting with Android 1.6 (API Level 4), the Android platform includes a new Text-to-Speech (TTS) capability. Also known as "speech synthesis", TTS enables your Android device to "speak" text of different languages.
    Intent checkIntent = new Intent();
        checkIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
        startActivityForResult(checkIntent, MY_DATA_CHECK_CODE);

3. Create TextToSpeech instance or installed the TextToSpeech API and create instance.
private TextToSpeech mTts;
    protected void onActivityResult(
            int requestCode, int resultCode, Intent data) {
        if (requestCode == MY_DATA_CHECK_CODE) {
            if (resultCode == TextToSpeech.Engine.CHECK_VOICE_DATA_PASS) {
                // success, create the TTS instance
                mTts = new TextToSpeech(this, this);
            } else {
                // missing data, install it
                Intent installIntent = new Intent();
                installIntent.setAction(
                    TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
                startActivity(installIntent);
            }
        }
    }

4. Configure with locale Implementation
    @Override
    public void onInit(int status) {
        mTts.setLanguage(Locale.US);
    }

5. Call the speak() to test the TTS
    mTts.speak("hai this is for testing, Karhtik is testing this application", TextToSpeech.QUEUE_FLUSH, null);

6. Sample Code
public class MainActivity extends Activity implements OnInitListener {
    int MY_DATA_CHECK_CODE = 1;
    private TextToSpeech mTts;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Intent checkIntent = new Intent();
        checkIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
        startActivityForResult(checkIntent, MY_DATA_CHECK_CODE);
    }


    protected void onActivityResult(
            int requestCode, int resultCode, Intent data) {
        if (requestCode == MY_DATA_CHECK_CODE) {
            if (resultCode == TextToSpeech.Engine.CHECK_VOICE_DATA_PASS) {
                // success, create the TTS instance
                mTts = new TextToSpeech(this, this);
            } else {
                // missing data, install it
                Intent installIntent = new Intent();
                installIntent.setAction(
                    TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
                startActivity(installIntent);
            }
        }
    }

    @Override
    public void onInit(int status) {
        mTts.setLanguage(Locale.US);
        mTts.speak("hai this is for testing, Karhtik is testing this application", TextToSpeech.QUEUE_FLUSH, null);
    }
}

Hope this is helpful for you.