Thursday, May 20, 2010

Create a Circle in Andrind

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();

        mPaints2 = new Paint(mPaints1);
        mBigOval = new RectF(40, 10, 280, 250);

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


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) {

        mPaints1 = new Paint();
        mPaints2 = new Paint();

        mPaints2 = new Paint(mPaints1);
        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);

    protected void onDraw(Canvas canvas) {
        drawArcs(canvas, mBigOval, true, mPaints2);
        mSweep += 2;
        if (mSweep > 360) {
            mStart += 10;
            if (mStart >= 360) {
                mStart -= 360;
            mBigIndex = (mBigIndex + 1);

Monday, May 10, 2010

Steps to create Andriod Widget

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=""
    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" />

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

    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(, now);
        appWidgetManager.updateAppWidget(appWidgetIds, updateViews);

        RemoteViews views = new RemoteViews(context.getPackageName(),R.layout.main);
        views.setOnClickPendingIntent(, 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=""
        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">       
            <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
        <meta-data android:name="android.appwidget.provider" android:resource="@xml/widget" />       

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

Sunday, May 9, 2010

Andriond Interview Question -1

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 :

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.

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 file. You could not edit manually. This have been generated automatically by understanding resource files etc.
4. AndroidManifest -It contains the Project properties
5. Android lib.

Refer :

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

Friday, May 7, 2010

Create Dynamic View Group

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;

    public void onCreate(Bundle savedInstanceState) {
        btn = (Button) findViewById(;
        btn1 = (Button) findViewById(;
        l = (LinearLayout) findViewById(;
        linflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        btn.setOnClickListener(new myListener());
        btn1.setOnClickListener(new myListener1());

    class myListener implements View.OnClickListener {
        public void onClick(View v) {
            View myView = linflater.inflate(R.layout.dynamicoption, null);

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

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
    android:layout_width="fill_parent" android:layout_height="fill_parent"

    <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"

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
    android:layout_width="wrap_content" android:layout_height="wrap_content"
    <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>