Send Notification inside background Thread

In my old exercise, it's shown how to "Start a service to send Notification". It's modified to send the notification inside a background thread here.

package com.exercise.AndroidThreadNotification;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;

public class AndroidThreadNotification extends Activity {
 
 BackgroundThread backgroundThread;
 Handler backgroundHandler;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
   }
  
   @Override
 protected void onStart() {
  // TODO Auto-generated method stub
  super.onStart();
  backgroundThread = new BackgroundThread();
  backgroundThread.setRunning(true);
  backgroundThread.start();
 }

 @Override
 protected void onStop() {
  // TODO Auto-generated method stub
  super.onStop();
  boolean retry = true;
  backgroundThread.setRunning(false);
  
  while(retry){
   try {
    backgroundThread.join();
    retry = false;
   } catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   } 
  }
  
 }

 public class BackgroundThread extends Thread {
    boolean running = false;
    final static String ACTION = "NotifyServiceAction";
    NotificationManager notificationManager;
    Notification myNotification;
    private final String myBlog = "http://android-er.blogspot.com/";
    private static final int MY_NOTIFICATION_ID=1;
    
    void setRunning(boolean b){
     running = b; 
    }

  @Override
  public synchronized void start() {
   // TODO Auto-generated method stub
   super.start();
   notificationManager =
      (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
  }

  @Override
  public void run() {
   // TODO Auto-generated method stub
   while(running){
    try {
     sleep(10000); //send notification in every 10sec.
    } catch (InterruptedException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    
    // Send Notification
    myNotification = new Notification(R.drawable.icon,
      "Notification!",
      System.currentTimeMillis());
    Context context = getApplicationContext();
    String notificationTitle = "Exercise of Notification!";
    String notificationText = "http://android-er.blogspot.com/";
    Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(myBlog));
    PendingIntent pendingIntent
     = PendingIntent.getActivity(getBaseContext(),
       0, myIntent,
        Intent.FLAG_ACTIVITY_NEW_TASK);
    myNotification.defaults |= Notification.DEFAULT_SOUND;
    myNotification.flags |= Notification.FLAG_AUTO_CANCEL;
    myNotification.setLatestEventInfo(context,
      notificationTitle,
      notificationText,
      pendingIntent);
    notificationManager.notify(MY_NOTIFICATION_ID, myNotification);
   }
  }
   }
}

Download the files.