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!
Java代码
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package com.ray.test;
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import java.util.Timer;
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import java.util.TimerTask;
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import android.app.Activity;
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import android.os.Bundle;
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public class JavaTimer extends Activity {
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Timer timer = new Timer();
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TimerTask task = new TimerTask(){
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public void run() {
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setTitle("hear me?");
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}
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};
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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timer.schedule(task, 10000);
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}
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}
但实际上的用法应该通过配合Handler来实现timer功能的!
Java代码
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package com.ray.test;
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import java.util.Timer;
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import java.util.TimerTask;
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import android.app.Activity;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Message;
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public class TestTimer extends Activity {
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Timer timer = new Timer();
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Handler handler = new Handler(){
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public void handleMessage(Message msg) {
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switch (msg.what) {
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case 1:
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setTitle("hear me?");
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break;
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}
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super.handleMessage(msg);
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}
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};
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TimerTask task = new TimerTask(){
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public void run() {
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Message message = new Message();
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message.what = 1;
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handler.sendMessage(message);
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}
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};
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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timer.schedule(task, 10000);
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}
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}
作者:chang_xing 发表于2012-8-3 18:48:39
原文链接