Question

我想在ExecutorService中停止所有任务。

现在我试试：

    mExecutor.shutdownNow();
    // Prepare Scroller data
    mExecutor.execute(new Scroller(destination, speed));

但我抓住了异常

F/RH2.C.AndroidRuntime(20514): java.util.concurrent.RejectedExecutionException: Task ### rejected from java.util.concurrent.ThreadPoolExecutor@425a3ab0[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
F/RH2.C.AndroidRuntime(20514):  at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1979)
F/RH2.C.AndroidRuntime(20514):  at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:786)
F/RH2.C.AndroidRuntime(20514):  at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1307)
F/RH2.C.AndroidRuntime(20514):  at java.util.concurrent.Executors$DelegatedExecutorService.execute(Executors.java:552)

我如何解决这个问题？
P.S。我的多线程知识是如此之低，所以如果你解释我为什么会有这个例外，我会很高兴。感谢。

Answer 1

mExecutor.shutdownNow();
// Prepare Scroller data
mExecutor =  Executors.newCachedThreadPool();//or other pool which u need

mExecutor.execute(new Scroller(destination, speed));
By this way u can go.

Answer 2

在Executor上调用shutdownNow()方法后。

您无法向其提交任何新的Runnable / Thread实例。如果你试图这样做，它会给你这个例外。

Answer 3

当您在执行程序已经关闭时尝试提交作业/任务时，会获得RejectedExecutionException。要解决此问题，您必须确保Executor已启动并运行。在提交作业之前，检查执行程序正在运行。

mExecutor.shutdownNow();
// Prepare Scroller data
if(mExecutor == null || mExecutor.isShutdown()) {
  //whatever your executor type is, create new instance is its shutdown already
  mExecutor = Executors.newSingleThreadScheduledExecutor();
}
mExecutor.execute(new Scroller(destination, speed));

有关详细信息，请查看此链接，其中包含一些示例代码： http://handling-thread.blogspot.co.uk/2012/05/pause-and-resume-thread.html

执行程序停止所有正在运行的任务并再次运行

3 个答案: