java学习_Timer相关

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1.Timer

Timer outTimer=null;
OutTimerTask outTimeTask=null;

//构造&初始化

outTimer = new Timer();

//开启超时

outTimeTask = new OutTimerTask();//每次都要构造新的TimerTask，TimerTask被cancle掉就不能再用了。
outTimer.schedule(outTimeTask, 40*1000);//40s超时

private class OutTimerTask extends TimerTask{@Overridepublic void run() {cancel();//在这里做的就是超时处理}}

也可以写一个工具类：

import java.util.TimerTask;public class OutTimerTask extends TimerTask {public interface OutTimerTaskWatcher {public void timeOutNotify(int id);}//data..OutTimerTaskWatcher watcher;int id=0;//=end: data..public OutTimerTask(OutTimerTaskWatcher watcher, int id) {this.watcher = watcher;this.id = id;}@Overridepublic void run() {// TODO Auto-generated method stubwatcher.timeOutNotify(id);}}

2.AlarmManager(for android)

如果把一个timer放在Activity或Service里，时间长了很可能被干掉。

所以Android提供了AlarmManager，我们只需要注册

//闹钟到时后触发的动作，定义在这里。这是启动一个Service，也可以是BroadcastReceiver，详见ApiDemoPendingIntent  mAlarmSender = PendingIntent.getService(MainActivity.this,                0, new Intent(MainActivity.this, TaskService.class), 0);

// Schedule the alarm!                AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);                am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,                                firstTime, Common.TaskAlarmRate, mAlarmSender);

// And cancel the alarm.                AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);                am.cancel(mAlarmSender);