Sample Search Implementation using TextWatcher

In this example, we will learn how to implement a search functionality in a listview using filters in your Android application. A listview can be filtered by the user input and is enabled using addTextChangedListener method. The search function will filter the listview with a matching string from the user input. Searching through the listview provides users an easy way to find the information they needed. We will create a listview with an edittext placed on top and on text input will filter the results and on listview item click will open a new activity. So lets begin…

public class SampleSearch extends Activity implements TextWatcher {

ArrayList arraylist = new ArrayList();

private void loadData() {

arraylist.add(new CustomVO("Ganesan"));

arraylist.add(new CustomVO("Ram"));

arraylist.add(new CustomVO("Ravi"));

arraylist.add(new CustomVO("Varshika"));

}

ListView listview;

EditText editsearch;

MyAdapter adapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.sample_search);

loadData();

listview = (ListView) findViewById(R.id.list_view);

editsearch = (EditText) findViewById(R.id.search_view);

adapter = new MyAdapter(this, android.R.layout.simple_list_item_1,

arraylist);

listview.setAdapter(adapter);

editsearch.addTextChangedListener(this);

}

@Override

public void afterTextChanged(Editable arg0) {

String text = editsearch.getText().toString()

.toLowerCase(Locale.getDefault());

adapter.filter(text);

}

@Override

public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,

int arg3) {

}

@Override

public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {

}

@SuppressLint("DefaultLocale")

public class MyAdapter extends ArrayAdapter {

ArrayList list;

ArrayList allDataList = new ArrayList();

private LayoutInflater mInflater;

public MyAdapter(Context context, int resource, ArrayList list) {

super(context, resource, list);

this.list = list;

this.allDataList.addAll(list);

mInflater = LayoutInflater.from(context);

}

@Override

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

final ViewHolder holder;

if (convertView == null) {

holder = new ViewHolder();

convertView = mInflater.inflate(

android.R.layout.simple_list_item_1, null);

holder.name = (TextView) convertView

.findViewById(android.R.id.text1);

convertView.setTag(holder);

} else {

holder = (ViewHolder) convertView.getTag();

}

holder.name.setText(list.get(position).getName());

return convertView;

}

// Filter Class

@SuppressLint("DefaultLocale")

public void filter(String charText) {

charText = charText.toLowerCase(Locale.getDefault());

list.clear();

System.out.println(charText);

System.out.println(charText.length() == 0);

if (charText.length() == 0) {

list.addAll(allDataList);

} else {

for (CustomVO customVO : allDataList) {

if (customVO.getName().toLowerCase()

.contains(charText.toLowerCase())) {

list.add(customVO);

}

}

}

System.out.println(list);

notifyDataSetChanged();

}

class ViewHolder {

TextView name;

}

}

public class CustomVO {

private String name;

public CustomVO(String name) {

super();

this.name = name;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

}

}

Layout.xml

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

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

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <EditText

        android:id="@+id/search_view"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <ListView

        android:id="@+id/list_view"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_weight="1"

        android:background="#FF0000" />

</LinearLayout>