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);

     }