android 三种定时器的写法

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Java代码  

一、使用Timer 和 TimerTask
Timer timer = new Timer();
MyTimerTask timerTask = new MyTimerTask();
timer.schedule(timerTask, 3000, 1); // 延迟3秒钟,执行1次
//timer.cancel();// 取消
class MyTimerTask extends TimerTask {
@Override
public void run() {
//这里不能处理UI操作
// do something
}
}
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二、采用Handler的sendMessageDelayed(Message, long)
public void startAutoFlowTimer() {
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// do something
Message message = handler.obtainMessage(0);
sendMessageDelayed(message, 1000);
}
};
Message message = handler.obtainMessage(0);
handler.sendMessageDelayed(message, 1000);
}
handler.removeMessages(0) //结束调用
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三、采用Handler的postDelayed(Runnable, long) 方法,这个实现比较简单一些：
1. Handler handler=new Handler();
Runnable runnable=new Runnable(){
@Override
public void run() {
// do something
handler.postDelayed(this, 2000); //在这里实现每两秒执行一次
}
};
handler.postDelayed(runnable, 2000);//启动,两秒后执行runnable.
handler.removeCallbacks(runnable); //停止
---------------------------------------------------------------------------
//延迟执行
// 设置异步线程,
Handler handler = new Handler() {
public void handleMessage(Message msg) { // handle message
switch (msg.what) {
case 1:
//ui 方法
}
super.handleMessage(msg);
}
};
Message message = handler.obtainMessage(1);
handler.sendMessageDelayed(message, 3000); // 发送message,3秒后隐藏提示框

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