start an application from notification bar in android

Question

I have an application, I want to show my app icon to the notification bar when my application is running and i also want when user will click on my app icon present in the notification bar my app will be open. How to do this? Please Help!

Answer 1

To create a status bar notification, do this in your onCreate Method:

1. Get a reference to the NotificationManager:

     String ns = Context.NOTIFICATION_SERVICE;
     NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);
   

2. Instantiate the Notification:

     int icon = R.drawable.notification_icon;
     CharSequence tickerText = "Hello";
     long when = System.currentTimeMillis();
   
     Notification notification = new Notification(icon, tickerText, when);
   

3. Define the Notification's expanded message and Intent:

     Context context = getApplicationContext();
     CharSequence contentTitle = "My notification";
     CharSequence contentText = "Hello World!";
     Intent notificationIntent = new Intent(this, MyClass.class);
     PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
   
     notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
   

4. Pass the Notification to the NotificationManager:

     private static final int HELLO_ID = 1;
   
     mNotificationManager.notify(HELLO_ID, notification);
   

   That's it. Your user has now been notified.

Answer 2

The accepted answer is deprecated. Here is the way to show a dialog, from google's documentation.

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this).setSmallIcon(R.drawable
            .logo_listy).setContentTitle("My notification").setContentText("Hello World!");

    Intent resultIntent = new Intent(this, ResultActivity.class);
    TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
    stackBuilder.addParentStack(ResultActivity.class);
    stackBuilder.addNextIntent(resultIntent);
    PendingIntent resultPendingIntent =
            stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
    mBuilder.setContentIntent(resultPendingIntent);

    NotificationManager mNotificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    mNotificationManager.notify(0, mBuilder.build());

Answer 3

Few suggestions:

• if you want icon in the notification bar, you must send some notification.
• Application cannot be started by clicking on the notification icon. It may be started by clicking to the notification, that will be available if user pull-down notification bar. For that purpose you need to create PendingIntent.