You need to use a Status Bar Notification.
//Create the Notification
Notification notification = new Notification(
android.R.drawable.stat_sys_warning, //Icon to use
"Hello World!", //Text
System.currentTimeMillis() //When to display - i.e. now
);
//Create a PendingIntent to do something when the user clicks on the Notification
//Normally this would be something in your own app
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setData(Uri.parse("http://www.stackoverflow.com"));
PendingIntent pi = PendingIntent.getActivity(this, 0, intent, 0);
//Add the detail to the Notification
notification.setLatestEventInfo(
getApplicationContext(),
"Stack Overflow", //Title of detail view
"This will launch Stack Overflow", //Text on detail view
pi
);
//Display the Notification
NotificationManager nm = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
nm.notify(ID_HELLO_WORLD, notification); //ID_HELLO_WORLD is a int ID
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