Android(安卓)timer

http://www.javaeye.com/topic/422972

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！

Java代码

packagecom.ray.test;
importjava.util.Timer;
importjava.util.TimerTask;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.os.Message;
publicclassTestTimerextendsActivity{
Timertimer=newTimer();
Handlerhandler=newHandler(){
publicvoidhandleMessage(Messagemsg){
switch(msg.what){
case1:
setTitle("hearme?");
break;
}
super.handleMessage(msg);
}
};
TimerTasktask=newTimerTask(){
publicvoidrun(){
Messagemessage=newMessage();
message.what=1;
handler.sendMessage(message);
}
};
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
timer.schedule(task,10000);
}
}

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