Android Timer的用法示例

raymondlueng

写惯java的人可能会认为Timer的使用应该如下：
程序功能很简单：10秒后，SetTitle为“hear me?”，然后，实际上这样做是不行的，这跟Android的线程安全有关！
package com.ray.test;import java.util.Timer;import java.util.TimerTask;import android.app.Activity;import android.os.Bundle;public class JavaTimer extends Activity {Timer timer = new Timer();TimerTask task = new TimerTask(){public void run() {        setTitle("hear me?");}};    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        timer.schedule(task, 10000);    }} 
但实际上的用法应该通过配合Handler来实现timer功能的！
package com.ray.test;import java.util.Timer;import java.util.TimerTask;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;public class TestTimer extends Activity {Timer timer = new Timer();Handler handler = new Handler(){public void handleMessage(Message msg) {switch (msg.what) {    case 1:    setTitle("hear me?");break;    }    super.handleMessage(msg);}};TimerTask task = new TimerTask(){public void run() {Message message = new Message();    message.what = 1;    handler.sendMessage(message);  }};    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        timer.schedule(task, 10000);    }}