android – 用于调度固定速率任务的处理程序或计时器

解决方法@H_489_4@

使用Timer有一些缺点

>它只创建单个线程来执行任务和任务
运行时间太长,其他任务受损.
>它不处理由任务抛出的异常,并且线程只是终止,这会影响
其他计划任务,它们永远不会运行.

而另一方面,scheduledThreadPoolExecutor正确处理所有这些问题,并且使用Timer没有意义..有两种方法可以在你的情况下使用

> scheduleAtFixedRate(…)
> scheduleWithFixedDelay(..)

class LongRunningTask implements Runnable {

  @Override
  public void run() {
    System.out.println("Hello world");
  } 
}

scheduledThreadPoolExecutor exec = new scheduledThreadPoolExecutor(1);
long period = 100; // the period between successive EXECUTIONS
exec.scheduleAtFixedRate(new LongRunningTask (),duration,TimeUnit.MICROSECONDS);
long delay = 100; //the delay between the termination of one execution and the commencement of the next
exec.scheduleWithFixedDelay(new myTask(),TimeUnit.MICROSECONDS);

并取消执行者使用此 – ScheduledFuture

// schedule long running task in 2 minutes:
scheduledFuture scheduleFuture = exec.scheduleAtFixedRate(new myTask(),TimeUnit.MICROSECONDS);

... ...
// At some point in the future,if you want to cancel scheduled task:
scheduleFuture.cancel(true);