How to finish two instances of activity by finish method

Question

I started activity from service by getting gcm message from servers. If I get the message twice, than activity starts two times and if I click on back button and call finish() method than above activity gets closed. And then again click back button no activity happens.

Intent notificationIntent = new Intent(context,
                NotificationAcceptBookingActivity.class);
            notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            notificationIntent.putExtra("bookingId", booking.getBookingId());
            getApplication().startActivity(notificationIntent);ss

Answer 1

Don't try to create new instance of the activity again and again. Before starting the activity just close it if exists.

Answer 2

You shouldn't be having more than one instances of an activity alive at a time. However, if you still want it, maybe clearing the activity stack can help you with it. When starting the last activity, use

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);

to clear previous activity stack, which will kill 2 (or no matter how many) instances of the activity.