Auto search on listview TextWatcher android

activity class:

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

public class Search_DemoMainActivity extends Activity {



private ListView lv1;
   private String lv_arr[] =
    {
"Android", "iPhone",
"BlackBerry", "me",
"J2ME", "Listview",
"ArrayAdapter", "ListItem",
"Us", "UK", "India"
   };
ListView lst;
EditText edt;
ArrayAdapter<String> arrad;
Button btn;




    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
     
        lv1=(ListView)findViewById(R.id.listView1);
        edt = (EditText) findViewById(R.id.editText1);
     
             
     
        btn=(Button)findViewById(R.id.button1);
     
        arrad =  new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1 , lv_arr);
     
        lv1.setAdapter(arrad);
        // By using setTextFilterEnabled method in listview we can filter the listview items.
 
        btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

// TODO Auto-generated method stub

}
});
     
     
        lv1.setTextFilterEnabled(true);
     
        lv1.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {

// TODO Auto-generated method stub

AlertDialog.Builder builder = new AlertDialog.Builder(Search_DemoMainActivity.this);

builder.setTitle("Pick a color");

builder.setSingleChoiceItems(lv_arr, -1, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {

Toast.makeText(getApplicationContext(), lv_arr[item], Toast.LENGTH_SHORT).show();

}});

AlertDialog alert = builder.create();
alert.show();
}
});
     
     
        edt.addTextChangedListener(new TextWatcher()    
        {  
       
    public void onTextChanged( CharSequence arg0, int arg1, int arg2, int arg3)  
       {          
    // TODO Auto-generated method stub  
   
       }  
   
   
        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3)
        {      
        // TODO Auto-generated method stub  
       
        }  
       
        @Override    
        public void afterTextChanged( Editable arg0)  
                   {
               
        Search_DemoMainActivity.this.arrad.getFilter().filter(arg0);
       
                   }  
       
        });
        }
       
 
     
    }

==============================================================

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="vertical" >

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Button" />

    <EditText

        android:id="@+id/editText1"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content" >

        <requestFocus />

    </EditText>

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

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

    <ListView

        android:id="@+id/listView1"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content" >

    </ListView>

</LinearLayout>