How the handler instance runs a runnable even the app is killed in android?

Question

In my app, I have a handler in the MainActivity. In this handler, I get the timestamp value from the local database, change its value to current timestamp and update the local database. This event happens for every 2 minutes.

My problem is the local database should not be updated when my app is killed. But, the code in the handler runs even my app is killed and updated the timestamp value in the local database. So, when I open the app again it doesnot give me the last timestamp value that is stored in the database before my app is killed.

How to stop the handler when I kill my app? It is worth if explain me how the handler works exactly.

Source code:

    addEventHandler.postDelayed(new Runnable() {
        @Override
        public void run() {
                mockSpeedEventHandler.postDelayed(this, realTimeEventFrequency * 60 * 1000);
        }
    }, 60000);

Answer 1

I am not sure why you are using 2 handlers, but if assume that the code that runs is triggered by the 2nd one. The solution should be to stop both addEventHandler and mockSpeedEventHandler.