单击返回键两次退出,单击一次返回键Toast提示,在其后2s内再单击一次返回键就退出。
下面的代码主要是重写onKeyDown方法。
private static Boolean isExit =false; private static Boolean hasTask =false; Timer tExit =new Timer(); TimerTask task =new TimerTask() { @Override public void run() { isExit =false; hasTask =true; } }; @Override public boolean onKeyDown(int keyCode, KeyEvent event) { // TODO Auto-generated method stub if (keyCode == KeyEvent.KEYCODE_BACK) { if(isExit ==false ) { isExit =true; Toast.makeText(this, "再按一次退出安卓手机软件www.hlj114.com", Toast.LENGTH_SHORT).show(); if(!hasTask) { tExit.schedule(task, 2000); } } else { finish(); System.exit(0); } } return false; } |