android back key & 뒤로가기 두번 종료

android back key & 뒤로가기 두번 종료

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private boolean m_bFlag = false;     private Handler m_hHandler;              @Override     protected void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);                  m_hHandler = new Handler() {             @Override             public void handleMessage(Message msg) {                 if (msg.what == 0) {                     m_bFlag = false;                 }             }         };             }              @Override     public boolean onKeyDown(int KeyCode, KeyEvent event) {         super.onKeyDown(KeyCode, event);         if (event.getAction() == KeyEvent.ACTION_DOWN) {             switch (KeyCode) {             case KeyEvent.KEYCODE_BACK: // `뒤로` 키와 같은 기능을 한다.                 if (!m_bFlag) {                     Toast.makeText(getApplicationContext(), "'뒤로' 버튼을 한번 더 누르시면 종료됩니다", Toast.LENGTH_SHORT).show();                     m_bFlag = true;                     m_hHandler.sendEmptyMessageDelayed(0, 2000);                     return false;                 }                 else {                     finish();                 }                 return true;             }         }         return false;     }