Android封裝再按一次退出，Android封裝退出

Android封裝再按一次退出，Android封裝退出

private static long waitTime = 2000;    private static long touchTime = 0;   public static void onKeyDown(Activity mContext,int keyCode, KeyEvent event) {      if(event.getAction() == KeyEvent.ACTION_DOWN && KeyEvent.KEYCODE_BACK == keyCode) {            long currentTime = System.currentTimeMillis();            if((currentTime-touchTime)>=waitTime) {                //讓Toast的顯示時間和等待時間相同              Toast.makeText(mContext, "再按一次退出", (int)waitTime).show();                touchTime = currentTime;            }else {            mContext.finish();            }         }    }   public static void onBackPressed(Activity mContext) {               long currentTime = System.currentTimeMillis();           if((currentTime-touchTime)>=waitTime) {            //讓Toast的顯示時間和等待時間相同             Toast.makeText(mContext, "再按一次退出", (int)waitTime).show();               touchTime = currentTime;           }else {           mContext.finish();          //此處注釋為測底退出//       System.exit(0);       }           }  }

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