@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event){if (keyCode == KeyEvent.KEYCODE_BACK){if (isExit == false){isExit = true;Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();if (!hasTask){tExit.schedule(taskExitCheck, 2000);}} else{finish();}return false;}return super.onKeyDown(keyCode, event);}private Boolean isExit = false;private Boolean hasTask = false;Timer tExit = new Timer();TimerTask taskExitCheck = new TimerTask(){@Overridepublic void run(){isExit = false;hasTask = true;}};

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