Question

I created a handler, to imitate timer task.
because TimerTask was acting differently on different tablets.
so I created this handler method.
in timer there was a method timerTask.cancel();
but how to stop this handler
it keeps on running even after the application is exited.
as you can see logs running even after back press.

Handler handler = new Handler();

public void recursivelycallHandler(){
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {

            Log.d("handler is running", "true" + System.currentTimeMillis());
            recursivelycallHandler();

        }
    }, 100);
}

Answer 1

There are 3 methods to do that ..

handler.removeCallbacks(Runnable r);
handler.removeCallbacksAndMessages(null);
handler.removeMessages(int what)

In your case first two seem feasible .. add any of the above method in ondestroy or on a listener to backpress..