Shows a foreground notification for an Android service. Tapping the notification will display the app as if it was tapped in application launcher

showForegroundNotification.java

 	private static final int NOTIFICATION_ID = 1;

 	private void showForegroundNotification(String contentText) {
		// Create intent that will bring our app to the front, as if it was tapped in the app
		// launcher
		Intent showTaskIntent = new Intent(getApplicationContext(), MyMainActivity.class);
		showTaskIntent.setAction(Intent.ACTION_MAIN);
		showTaskIntent.addCategory(Intent.CATEGORY_LAUNCHER);
		showTaskIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

		PendingIntent contentIntent = PendingIntent.getActivity(
				getApplicationContext(),
				0,
				showTaskIntent,
				PendingIntent.FLAG_UPDATE_CURRENT);

		Notification notification = new Notification.Builder(getApplicationContext())
				.setContentTitle(getString(R.string.app_name))
				.setContentText(contentText)
				.setSmallIcon(R.drawable.ic_notification)
				.setWhen(System.currentTimeMillis())
				.setContentIntent(contentIntent)
				.build();
		startForeground(NOTIFICATION_ID, notification);
	}

Sources:

• http://stackoverflow.com/questions/3356095/how-to-bring-android-existing-activity-to-front-via-notification
• http://stackoverflow.com/questions/12074980/bring-application-to-front-after-user-clicks-on-home-button

Thanks, I was truggling with this.
Any chance to extend compatibility below API version 16?

@martinchodev
Try using getNotification for compatibility below API 16.

I know this gist is almost 3 years old, but I really found this useful.

However, I'm struggling to get this notification dismissed. It only closes when the application is destroyed.

What I'm trying to do is show a notification when the app goes to background (indicating that the service is still running) and when the user touches the notification (or goes back to the app from launcher/recent apps), the notification should be dismissed.

I set the notification's auto close tag to true and I'm using manager.cancel(MonitorService.NOTIF_ID) on the activity's onResume.

Here's a code snippet:
https://gist.github.com/Galarzaa90/5296804256f96a8d1d74d2432ce74fd2

@Galarzaa90 use stopForeground(true) in onDestroy of service

Awesome ; i was looking for this answer for 2 days !!!!

Very useful, worked perfectly for 2 years, but do not work anymore with migration to API26.
I tried this : change startService to startForegroundService, but does not show notification (no error messsage).
Does anyone have an idea ?

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
{
startForegroundService(new Intent(this, recordingService.class));
} else {
startService(new Intent(this, recordingService.class));
}

Could anyone tell me the possible reasons for foreground service to not show the notification. I have created a channel, started the service using ContextCompat.startForegroundService.