先寫乙個timer並通過sechedule計畫函式執行自己定義的timertask時間排程任務
private timer mtimer = null;
mtimer = new timer();
mtimer.schedule(new mytimertask(), 1000 ,time * 1000);
class mytimertask extends timertask
}
/**
* schedule a task for repeated fixed-delay execution after a specific delay.
** @param task
* the task to schedule.
* @param delay
* amount of time in milliseconds before first execution.
* @param period
* amount of time in milliseconds between subsequent executions.
* @throws illegalargumentexception
* if or .
* @throws illegalstateexception
* if the has been canceled, or if the task has been
* scheduled or canceled.
*/public void schedule(timertask task, long delay, long period)
scheduleimpl(task, delay, period, false);
}/** schedule a task.
*/private void scheduleimpl(timertask task, long delay, long period, boolean fixed)
long when = delay + system.currenttimemillis();
if (when < 0)
synchronized (task.lock)
if (task.cancelled)
task.when = when;
task.period = period;
task.fixedrate = fixed;
}// insert the newtask into queue
impl.inserttask(task);
}}
修改task的屬性設定好第一次的執行會在當前時間delay毫秒後，每隔period毫秒這行一次。
為了保證所有的時間計畫任務的執行都不會發生衝突，使用synchronized限定同一時間只能有乙個執行緒呼叫
scheduleimpl
private void inserttask(timertask newtask)接下來就要將自己定義的timertask插入到乙個陣列中
private int default_heap_size = 256;
private int size = 0;
private timertask timers = new timertask[default_heap_size];
public void insert(timertask task)
timers[size++] = task;
upheap();
}
/**
* contains scheduled events, sorted according to
* field of taskscheduled object.
*/private timerheap tasks = new timerheap();
private void upheap()
}
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