睡眠线程，直到事件出席了在另一个线程 [英] Sleep a thread until an event is attended in another thread

问题描述

我在一个Android应用程序两个线程，一个是认为线程，另外一个工作线程。我想做的事就是睡觉工作者线程，直到观点线程终止的OnDraw方法的处理。

I have two threads in an Android application, one is the view thread, and the other a worker thread. What i want to do is to sleep the worker thread until the view thread terminates the handling of the onDraw method.

我可怎么办呢？有一个信号什么的等待？

How i can do this? is there a wait for a signal or something?

推荐答案

共享的java.lang.Object两个线程，其唯一目的就是要告诉工作线程时，它可以继续开展工作的。每当工作线程达到一个点，它应该睡觉了，它这样做：

Share a java.lang.Object between the two threads, whose sole purpose is to tell the worker thread when it can continue its work. Whenever the worker thread reaches a point where it should sleep, it does this:

stick.wait();

在视图线程完成其OnDraw中的工作，它调用这样的：

When the view thread finishes its onDraw work, it calls this:

stick.notify();

请注意，该视图线程拥有该对象上的显示器的需求。在你的情况，这应该是相当简单的执行与小同步块：

Note the requirement that the view thread owns the monitor on the object. In your case, this should be fairly simple to enforce with a small sync block:

void onDraw() {
  ...
  synchronized (stick) {
    stick.notify();
  }
} // end onDraw()

请教关于这些方法的javadoc的java.lang.Object（和notifyAll的，以防万一）;他们写得很好。

Consult the javadoc for java.lang.Object on these methods (and notifyAll, just in case); they're very well written.

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