【Android】【转】实现android中Activity实现再按一次退出

Exit exit = new Exit();  

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
   if (keyCode == KeyEvent.KEYCODE_BACK) {
        pressAgainExit();
        return true;
   }
   return super.onKeyDown(keyCode, event);
}

private void pressAgainExit() {
   if (exit.isExit()) {
       finish();
   } else {
       Toast.makeText(getApplicationContext(), "再按一次退出程序",
).show();
       exit.doExitInOneSecond();
    }
}

 

辅助类Exit.java

package com.chen.b;

import android.os.Handler;
import android.os.HandlerThread;

public class Exit {

    private boolean isExit = false;
        private Runnable task = new Runnable() {
            @Override
            public void run() {
                isExit = false;
            }
        };
     
        public void doExitInOneSecond() {
            isExit = true;
            HandlerThread thread = new HandlerThread("doTask");
            thread.start();
            new Handler(thread.getLooper()).postDelayed(task, 1000);
        }
         
        public boolean isExit() {
            return isExit;
        }
     
        public void setExit(boolean isExit) {
            this.isExit = isExit;
        }
    }

 

源自：http://www.cnblogs.com/android100/archive/2012/06/22/Activity-exit.html