android延续按两次返回退出程序（完整代码）

android连续按两次返回退出程序（完整代码）
UserHelper

package com.hk.icie;public class UserHelper {private static Boolean isExit = false;public static Boolean getIsExit() {return isExit;}public static void setIsExit(Boolean isExit) {UserHelper.isExit = isExit;}}

ExitTimerTask

package com.hk.utils;import java.util.TimerTask;import com.hk.icie.UserHelper;public class ExitTimerTask extends TimerTask {@Overridepublic void run() {UserHelper.setIsExit(false);}}

Tab1Activity

// 此部分为了实现按两下返回退出private Timer tExit = new Timer();private ExitTimerTask exitTimerTask = new ExitTimerTask();@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK) {if (!UserHelper.getIsExit()) {UserHelper.setIsExit(true);AlertUtils.ToastAlert(Tab1Activity.this, R.string.alert_exit);if (tExit != null) {if (exitTimerTask != null) {// 将原任务从队列中移除(必须的，否则报错)exitTimerTask.cancel();}// 新建一个任务exitTimerTask = new ExitTimerTask();tExit.schedule(exitTimerTask, 2*1000);}}else {UserHelper.setIsExit(false);finish();System.exit(0);}}return true;}

需要注意的是

原作者：http://www.verydemo.com/demo_c131_i55849.html

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