Question

I have Activity that download a file in progress dialog. And when user press to the button “hide” activity creates notification and hide progress dialog. And when user click to the notification, activity showing progress dialog in the activity again. How could I switch activity to the back task on pressing to the button “Back”?

Answer 1

What you need to do is to call finish() to remove the Activity from the stack.
Then in your notification, you set the name of the Activity to be called when you click on it, something like this:

NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); 
Notification notification = new Notification(R.drawable.icon,
  "A new notification", System.currentTimeMillis());
// Specify the called Activity
Intent intent = new Intent(this, YourActivityName.class);
intent.putBoolean("isDownloading", true); // check this value in Activity
PendingIntent activity = PendingIntent.getActivity(this, 0, intent, 0);
notification.setLatestEventInfo(this, "This is the title",
  "This is the text", activity);
notificationManager.notify(0, notification);