Minor nitpicking: launching of activity from ApduService not in background thread

[suzukieng]

You forgot to spawn off the thread. Not sure if it matters though, as startActivity apparently forces itself to execute on the main thread anyway.

private void startPaymentActivityInBackgroundThread() {
        new Runnable() {
            @Override
            public void run() {

                //Start Payment Activity
                Intent intent = new Intent(getApplicationContext(), PayActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
                getApplicationContext().startActivity(intent);

                //Vibrate
                Vibrator v = (Vibrator) getApplicationContext().getSystemService(Context.VIBRATOR_SERVICE);
                v.vibrate(500);
            }
        }.run();
    }