android中关于activity的返回键处理方法

来源：互联网发布：度量衡换算软件编辑：程序博客网时间：2024/05/21 09:33

/** * 菜单、返回键响应 */@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubUtiltools.printE("调用双击退出函数onKeyDown"+keyCode+ KeyEvent.KEYCODE_BACK);if (keyCode == KeyEvent.KEYCODE_BACK) {exitBy2Click(); // 调用双击退出函数}return false;}/** * 双击退出函数 */private static Boolean isExit = false;private void exitBy2Click() {Timer tExit = null;if (isExit == false) {isExit = true; // 准备退出Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();tExit = new Timer();tExit.schedule(new TimerTask() {@Overridepublic void run() {isExit = false; // 取消退出}}, 2000); // 如果2秒钟内没有按下返回键，则启动定时器取消掉刚才执行的任务} else {//MyApplication.removeAll();MyApplication application = (MyApplication) getApplication();application.finishAllContext();System.exit(0);}}

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