How to cancel handler.postDelayed?

What if I have handler.postDelayed thread already under execution and I need to cancel it?

Solution 1:

I do this to cancel postDelays, per the Android: removeCallbacks removes any pending posts of Runnable r that are in the message queue.

handler.removeCallbacks(runnableRunner);

or use to remove all messages and callbacks

handler.removeCallbacksAndMessages(null);

Solution 2:

If you don't want to keep a reference of the runnable, you could simply call:

handler.removeCallbacksAndMessages(null);

The official documentation says:

... If token is null, all callbacks and messages will be removed.