Android再按一次后退键退出应用程序

来源：互联网发布：linux退出文件夹命令编辑：程序博客网时间：2024/06/07 01:14

方法一

private static Boolean isExit = false;   Timer tExit = new Timer();  MyTimerTask  task;  class MyTimerTask  extends TimerTask{      public void run() {       isExit = false;   }  }       public boolean onKeyDown(int keyCode, KeyEvent event) {           if (keyCode == KeyEvent.KEYCODE_BACK) {          if(isExit == false ) {              isExit = true;              Toast.makeText(this, "再按一次后退键退出应用程序", Toast.LENGTH_SHORT).show();              if(task!=null)                  task.cancel();                // 将原任务从队列中移除             task = new MyTimerTask();          // 新建一个任务                           tExit.schedule(task, 2000);          } else {              finish();       System.exit(0);          }     }       return false;  }

方法二

</pre><pre name="code" class="java">private long exitTime = 0;   public boolean onKeyDown(int keyCode, KeyEvent event) {     if(keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN){         if((System.currentTimeMillis()-exitTime) > 2000){             Toast.makeText(getApplicationContext(), "再按一次后退键退出程序", Toast.LENGTH_SHORT).show();             exitTime = System.currentTimeMillis();         } else {             //退出代码         }         return true;     }     return super.onKeyDown(keyCode, event);  }

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