在android中重新安排计时器 [英] Reschedule timer in android

问题描述

如何重新安排计时器.我试图取消计时器/计时器任务并使用一种方法重新安排它.但它显示异常错误:

<前>异常错误java.lang.IllegalStateException: TimerTask 已经安排好了

我用过的代码:

<前>private Timer timer = new Timer("alertTimer",true);公共无效reScheduleTimer(int持续时间){定时器.取消()；timer.schedule(timerTask, 1000L, duration * 1000L);}

解决方案

如果您查看有关 Timer.cancel() 的文档，您将看到:

取消计时器和所有计划任务.如果有当前正在运行的任务，它不会受到影响.不能在此计时器上安排更多任务.后续调用不执行任何操作."

重新安排时需要初始化一个新的计时器:

public void reScheduleTimer(int duration) {timer = new Timer("alertTimer",true);timerTask = new MyTimerTask();timer.schedule(timerTask, 1000L, duration * 1000L);}私有类 MyTimerTask 扩展了 TimerTask {@覆盖公共无效运行(){//做东西}}

How can I reschedule a timer. I have tried to cancel the timer/timertask and and schedule it again using a method. But its showing an exception error:

Exception errorjava.lang.IllegalStateException: TimerTask is scheduled already

Code I have used it :

private Timer timer = new Timer("alertTimer",true);
public void reScheduleTimer(int duration) {
    timer.cancel();
    timer.schedule(timerTask, 1000L, duration * 1000L);
}

解决方案

If you see the documentation on Timer.cancel() you'll see this:

"Cancels the Timer and all scheduled tasks. If there is a currently running task it is not affected. No more tasks may be scheduled on this Timer. Subsequent calls do nothing."

You'll need to initialize a new Timer when you are rescheduling:

EDIT:

public void reScheduleTimer(int duration) {
  timer = new Timer("alertTimer",true);
  timerTask = new MyTimerTask();
  timer.schedule(timerTask, 1000L, duration * 1000L);
}

private class MyTimerTask extends TimerTask {
  @Override
  public void run() {
    // Do stuff
  }
}

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