android 連續點擊退出程式

標籤：

package com.test.twiceexit;

import java.util.Timer;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.KeyEvent;
import android.view.Menu;
import android.widget.Toast;

public class MainActivity extends Activity {
private static Boolean isQuit = false;
private long mExitTime = 0;

Timer timer = new Timer();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

/**************************************************
* 方法一
* ************************************************/
//@Override
//public boolean onKeyDown(int keyCode, KeyEvent event) {
//if (keyCode == KeyEvent.KEYCODE_BACK) {
//if (isQuit == false) {
//isQuit = true;
//Toast.makeText(getBaseContext(), "再按一次返回鍵退出程式",
//Toast.LENGTH_SHORT).show();
//TimerTask task = null;
//task = new TimerTask() {
//public void run() {
//isQuit = false;
//}
//};
//timer.schedule(task, 2000);
//} else {
//finish();
//System.exit(0);
//}
//}
//return false;
//}

/**************************************************
* 方法二
* ************************************************/
//@Override
//public boolean onKeyDown(int keyCode, KeyEvent event) {
//if (keyCode == KeyEvent.KEYCODE_BACK) {
//if ((System.currentTimeMillis() - mExitTime) > 2000) {//
//// 如果兩次按鍵時間間隔大於2000毫秒，則不退出
//Toast.makeText(this, "再按一次退出程式", Toast.LENGTH_SHORT).show();
//mExitTime = System.currentTimeMillis();// 更新mExitTime
//} else {
//System.exit(0);// 否則退出程式
//}
//return true;
//}
//return super.onKeyDown(keyCode, event);
//
//}

/**************************************************
* 方法三
* ************************************************/
Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
isQuit = false;
}
};

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (!isQuit) {
isQuit = true;
Toast.makeText(getApplicationContext(), "再按一次退出程式",
Toast.LENGTH_SHORT).show();
// 利用handler延遲發送更改狀態資訊
mHandler.sendEmptyMessageDelayed(0, 2000);
} else {
finish();
System.exit(0);
}
}
return false;
}
}

android 連續點擊退出程式