Android简单的Timer小例子

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！

packagecom.ray.test;

importjava.util.Timer;
importjava.util.TimerTask;

importandroid.app.Activity;
importandroid.os.Bundle;

publicclassJavaTimerextendsActivity{

Timertimer=newTimer();
TimerTasktask=newTimerTask(){

publicvoidrun(){
setTitle("hearme?");
}

};
publicvoidonCreate(BundlesavedInstanceState){
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);
}
}