How to stop the thread in Android?

Question

I have a thread in my callback function as follows:

@Override
public void onConnectError(final BluetoothDevice device, String message) {
    Log.d("TAG","Trying again in 3 sec.");
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            Handler handler = new Handler();
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                   //Do something 
                }
            }, 2000);
        }
    });
}

I will to close the the above thread when I press the back button or onDestroy. How can I do it. Thank you

@Override
public void onBackPressed() {
    // Close or distroy the thread
 }
@Override
public void onDestroy() {
    // Close or distroy the thread
 }

Answer 1

Please do this like

private Handler handler;
private Runnable runnable;

@Override
public void onConnectError(final BluetoothDevice device, String message) {
Log.d("TAG","Trying again in 3 sec.");
runOnUiThread(new Runnable() {
    @Override
    public void run() {
        handler = new Handler();
runnable = new Runnable() {
        @Override
        public void run() {
//Do something
        }
    };
handler.postDelayed(runnable, 2000);
    }
});
}

and

@Override
public void onBackPressed() {
if (handler != null && runnable != null) {
        handler.removeCallbacks(runnable);
    }
 }

and same in onDestroy();