Android Tutorial-How to Make Press Once Again to Exit ( Double Press Back ) in Android || কিভাবে দবল ক্লিকের মাধ্যমে এন্ড্র্যেড এ্যাপ বন্ধ করা যায়

	private static final int PERIOD = 2000;
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
	if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
	switch (event.getAction()) {
	case KeyEvent.ACTION_DOWN:
	if (event.getDownTime() - lastPressedTime < PERIOD) {
	finish();
	} else {
	Toast.makeText(getApplicationContext(), "Press again to exit.",
	Toast.LENGTH_SHORT).show();
	lastPressedTime = event.getEventTime();
	}
	return true;
	}
	}
	return false;
	}

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