Timer用法

应用场景：在指定的时间之后执行某操作

代码如下：TimerTestActivity.java

public class TimerTestActivity extends Activity
{
    
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Timer timer = new Timer();
        timer.schedule(timerTask, 3000);// 在指定时间执行timerTask
    }
    
    TimerTask timerTask = new TimerTask()
    {
        @Override
        public void run()
        {
            Message message = new Message();
            message.what = 1;
            handler.sendMessage(message);// 发送消息
        }
    };
    
    Handler handler = new Handler()
    {
        public void handleMessage(Message msg)// 处理消息
        {
            switch (msg.what)
            {
                case 1:
                    setTitle("Hello,I am Harvey");
                    Toast.makeText(TimerTestActivity.this, "Hello,I am Harvey", Toast.LENGTH_LONG).show();
                    break;
                default:
                    break;
            }
        }
    };
}