java shutdownNow（）然后重新调度ScheduledThreadPoolExecutor:如何？

Question

我正在使用ScheduledThreadPoolExecutor研究按钮单击的调度方法。 如果在执行方法之前再次单击按钮，我希望关闭执行器并重新安排。 我使用boolean和try/catch来实现这一点，但executor似乎只是被关闭了，并没有再次计划

这是我的代码的问题，还是线程处理的本质

下面是我的代码

JAVA

ScheduledTrheadPoolExecutor se = new ScheduledThreadPoolExecutor(1);
se.setRejectedExecutionHandler(new ThreadPoolExecutor.DiscardOldestPolicy());
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) 
  se.setRemoveOnCancelPolicy(true);

...
if (!clicked) {
  se.schedule(runnable, 10, TimeUnit.SECONDS);
  clicked = true;
} else {
  try {
    se.shutdownNow();
    se.schedule(runnable, 10, TimeUnit.SECONDS);
  } catch (RejectedExecutionExeption e) {
    e.printStackTrace();
  }
}

Answer 1

首先在顶部初始化的ScheduledTrheadPoolExecutor se = new ScheduledThreadPoolExecutor(1);行下方设置se.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);

然后在关闭当前执行器后，重新初始化，如下所示：

    try {
       se.shutdownNow();
      // Previous Executor is terminated, but to re-schedule task again Executor has to be initialized .
       se = new ScheduledThreadPoolExecutor(1);
       se.setRejectedExecutionHandler(new 
       ThreadPoolExecutor.DiscardOldestPolicy());
       se.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
       se.setRemoveOnCancelPolicy(true);
       se.schedule(runnable, 10, TimeUnit.SECONDS);

       } catch (Exception e) {
         e.printStackTrace();
    }