To do recursive works in Androd

1.  Create Notification service...

public class NotificationService extends Service{

public static boolean registered = false;

@Override

public int onStartCommand(Intent intent, int flags, int startId) {

   Log.i("NotificationService", "Service Started!!!@@@@@@@@@@@@@@@@@@@@@@@");

   // TODO Add your jobs here

   return Service.START_STICKY; // .START_NOT_STICKY;

}

@Override

public IBinder onBind(Intent intent) {

     Log.i("NotificationService", "Service binded!!!@@@@@@@@@@@@@@@@@@@@@@@");

     // TODO Auto-generated method stub

     return null;

}

public static void startMe(final Context ctx, final long secs, boolean force){

     if(registered && !force) return;

     Log.i("NotificationService", "startMe!!!@@@@@@@@@@@@@@@@@@@@@@@");

     (new Thread(){

      public void run(){

       try {

          sleep(secs * 1000); // you can remove this code, if you don't want to have initial delay...

      } catch (InterruptedException e) {

      }

       Calendar cal = Calendar.getInstance();

      Intent intent = new Intent(ctx, NotificationService.class);

      PendingIntent pintent = PendingIntent.getService(ctx, 0, intent, 0);

      AlarmManager alarm = (AlarmManager)ctx.getSystemService(Context.ALARM_SERVICE);

       // Start every secs seconds

      alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), secs*1000, pintent);

       // alarm.cancel(operation);

      registered = true;

   }

}).start();
}
}

2. Update manifest xml.

<application

... >

....

<service android:name="com.examples.NotificationService"

android:enabled="true" />

3. Start service
In your activity or some where...

@Override
protected void onCreate(Bundle savedInstanceState) {

   super.onCreate(savedInstanceState);

   setContentView(R.layout.activity_test);

   NotificationService.startMe(getBaseContext(), 30); // starts every 30 secs.

}