Android 软件退出系统方法重写

Android 软件退出系统按键方法重写

     //针对Andriod软件退出系统按键方法重写

     private long exitTime = ;//key down time
     @Override
     public boolean onKeyDown(int keyCode, KeyEvent event) {
         switch (keyCode) {
             case KeyEvent.KEYCODE_BACK:
                 if (System.currentTimeMillis() - exitTime >= ) {
                     exitTime = System.currentTimeMillis();
                     showToast(getString(R.string.quit_on_double_click_));
                     return true;
                 } else {
                     showToast(getString(R.string.exiting));
                     try {
                         Thread.sleep();
                     } catch (InterruptedException e) {
                         e.printStackTrace();
                     }
                     finish();
                 }
                 break;
         }
         return super.onKeyDown(keyCode, event);
     }