如何检查是否在运行Android UI线程？ [英] How to check if running on UI thread in Android?

问题描述

我怎么能知道，如果运行code是主线程（UI线程）上执行？
随着秋千我用的是 isEventDispatchThread 方法...

How can I know if the running code is executed on the main thread (UI thread)?
With Swing I use the isEventDispatchThread method...

推荐答案

看起来不像有该SDK中的方法。该检查是在<一个href="http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;f=core/java/android/view/ViewRoot.java;h=bef3e580a0c5ad037a0b495979ecf567c5a80995;hb=HEAD#l2681"><$c$c>ViewRoot类是通过比较 Thread.currentThread（）来被分配在构造函数中，但不会暴露类成员完成的。

Doesn't look like there is a method for that in the SDK. The check is in the ViewRoot class and is done by comparing Thread.currentThread() to a class member which is assigned in the constructor but never exposed.

如果你真的需要这个检查可以有多种选择来实现它：

If you really need this check you have several options to implement it:

1. 赶android.view.ViewRoot $ CalledFromWrongThreadException
2. <一个href="http://developer.android.com/reference/android/view/View.html#post%28java.lang.Runnable%29"><$c$c>post一个的Runnable 来一个观点，并检查 Thread.currentThread（）
3. 使用 处理程序 以做同样的

1. catch the android.view.ViewRoot$CalledFromWrongThreadException
2. post a Runnable to a view and check Thread.currentThread()
3. use a Handler to do the same

在一般我想代替的检查的，无论你是在正确的线程，你应该只的确定的的code总是执行在UI线程（使用2或3）。

In general I think instead of checking whether you're on the correct thread, you should just make sure the code is always executed on the UI thread (using 2. or 3.).

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