java 休眠一个线程，直到另一个线程参加一个事件
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Sleep a thread until an event is attended in another thread
提问by Lucas S.
I have two threads in an Android application, one is the view thread, and the other is the worker thread. What I want to do is, sleep the worker thread until the view thread terminates the handling of the onDraw method.
我在一个 Android 应用程序中有两个线程，一个是视图线程，另一个是工作线程。我想要做的是，使工作线程休眠，直到视图线程终止对 onDraw 方法的处理。
How i can do this? is there any wait for the signal or something?
我怎么能做到这一点？有没有等待信号之类的？
回答by Paul Brinkley
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:
在两个线程之间共享一个 java.lang.Object，其唯一目的是告诉工作线程何时可以继续工作。每当工作线程到达应该休眠的点时，它会执行以下操作：
stick.wait();
When the view thread finishes its onDraw work, it calls this:
当视图线程完成其 onDraw 工作时，它会调用：
stick.notify();
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:
请注意视图线程拥有对象上的监视器的要求。在您的情况下，使用一个小的同步块来强制执行这应该相当简单：
void onDraw() {
...
synchronized (stick) {
stick.notify();
}
} // end onDraw()
Consult the javadoc for java.lang.Object on these methods (and notifyAll, just in case); they're very well written.
有关这些方法的 java.lang.Object（和 notifyAll，以防万一），请参阅 javadoc；他们写得很好。
回答by skaffman
If you want a higher-level concurreny API (with things like Barriers), you could try the backport of the java 5 concurrency API, which works on java 1.3 and above, and may work on Android. The likes of Object.wait/notify will work, but they can be a bit terse.
如果您想要更高级别的并发 API（带有 Barriers 之类的东西），您可以尝试向后移植 java 5 concurrency API，它适用于 java 1.3 及更高版本，并且可能适用于 Android。Object.wait/notify 之类的可以工作，但它们可能有点简洁。
