学步园

采用Handler、Timer和TimerTask一起使用

Timer是任务调度器

TimerTask是指定要执行的操作

Handler负责线程之间的通信去更新UI元素

1.先定义要执行的操作，主要是想handler发送消息

TimerTask task = new TimerTask() {					
			@Override
			public void run() {
				// TODO Auto-generated method stub
				handler.sendEmptyMessage(1);
			}
		};

2.定义Timer,去定时执行Task

Timer timer = new Timer();

timer.schedule(task, 1000, 1000);

3.在Handler中更新Ui

private Handler handler = new MyHandler();
	private final class MyHandler extends Handler{
		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			switch (msg.what) {
			case 0:
				timertext.setText(""+i++);
				break;
			case 1:
				timertext.setText(""+i++);
				break;
			default:
				break;
			}
			
		}
	}