@Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { if (exitToast == null) { exitToast = Toast.makeText(LoginActivity.this, R.string.info_back_key_exit, Toast.LENGTH_LONG); } long delay = (exitToast.getDuration() == Toast.LENGTH_LONG ? 3500 : 2000); if (System.currentTimeMillis() - lastPressedBackKeyTime < delay) { exitToast.cancel(); LoginActivity.this.finish(); } else { exitToast.show(); } lastPressedBackKeyTime = System.currentTimeMillis(); } return false; }