Add our application into default chooser

activity

android:name=".WalkieTalkieActivity"

android:configChanges="orientation|keyboardHidden"

android:screenOrientation="portrait" >

<intent-filter>

<action android:name="android.intent.action.CALL" />

<data android:scheme="tel" />

<category android:name="android.intent.category.DEFAULT" />

<action android:name="android.intent.action.CALL_PRIVILEGED" />

</intent-filter>

</activity>

By using above code we can add our application to default chooser application in android 

Finish all activities

 package com.hrupin;  
 import android.app.Activity;  
 import android.content.BroadcastReceiver;  
 import android.content.Context;  
 import android.content.Intent;  
 import android.content.IntentFilter;  
 public abstract class AppBaseActivity extends Activity {  
  public static final String FINISH_ALL_ACTIVITIES_ACTIVITY_ACTION = "com.hrupin.FINISH_ALL_ACTIVITIES_ACTIVITY_ACTION";  
  private BaseActivityReceiver baseActivityReceiver = new BaseActivityReceiver();  
  public static final IntentFilter INTENT_FILTER = createIntentFilter();  
  private static IntentFilter createIntentFilter() {  
  IntentFilter filter = new IntentFilter();  
  filter.addAction(FINISH_ALL_ACTIVITIES_ACTIVITY_ACTION);  
  return filter;  
  }  
  protected void registerBaseActivityReceiver() {  
  registerReceiver(baseActivityReceiver, INTENT_FILTER);  
  }  
  protected void unRegisterBaseActivityReceiver() {  
  unregisterReceiver(baseActivityReceiver);  
  }  
  public class BaseActivityReceiver extends BroadcastReceiver {  
  @Override  
  public void onReceive(Context context, Intent intent) {  
   if (intent.getAction().equals(FINISH_ALL_ACTIVITIES_ACTIVITY_ACTION)) {  
   finish();  
   }  
  }  
  }  
  protected void closeAllActivities() {  
  sendBroadcast(new Intent(FINISH_ALL_ACTIVITIES_ACTIVITY_ACTION));  
  }  
 }