如何检查是否在Android的UI线程上运行？
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How to check if running on UI thread in Android?
提问by Arutha
How can I know if the running code is executed on the main thread (UI thread)?
With Swing I use the isEventDispatchThreadmethod...
如何知道正在运行的代码是否在主线程（UI 线程）上执行？
随着 Swing 我使用的isEventDispatchThread方法......
采纳答案by Josef Pfleger
Doesn't look like there is a method for that in the SDK. The check is in the ViewRootclass and is done by comparing Thread.currentThread()to a class member which is assigned in the constructor but never exposed.
看起来 SDK 中没有这种方法。检查在ViewRoot类中，通过与Thread.currentThread()在构造函数中分配但从未公开的类成员进行比较来完成。
If you really need this check you have several options to implement it:
如果你真的需要这个检查，你有几个选项来实现它：
- catch the android.view.ViewRoot$CalledFromWrongThreadException
postaRunnableto a view and checkThread.currentThread()- use a
Handlerto do the same
- 抓住 android.view.ViewRoot$CalledFromWrongThreadException
post一Runnable对的图，检查Thread.currentThread()- 使用 a
Handler做同样的事情
In general I think instead of checkingwhether you're on the correct thread, you should just make surethe code is always executed on the UI thread (using 2. or 3.).
一般来说，我认为与其检查您是否在正确的线程上，您应该确保代码始终在 UI 线程上执行（使用 2. 或 3.）。
回答by Dan Syrstad
Use Looper.getMainLooper().getThread() to get the UI thread. You can check if it is the current thread using the following expression:
使用 Looper.getMainLooper().getThread() 获取 UI 线程。您可以使用以下表达式检查它是否是当前线程：
Looper.getMainLooper().getThread() == Thread.currentThread()
回答by balazsbalazs
It is UI thread if:
它是 UI 线程，如果：
Looper.myLooper() == Looper.getMainLooper()
Source AOSP source code: ManagedEGLContext.java#L100, SharedPreferencesImpl.java#L470, Instrumentation.java#L1650and so on.
来源AOSP源代码：ManagedEGLContext.java#L100，SharedPreferencesImpl.java#L470，等。Instrumentation.java#L1650
回答by michael
You may also use runOnUiThread, it only requires a runnable that will be run in the ui thread
您也可以使用runOnUiThread，它只需要一个将在 ui 线程中运行的可运行对象
回答by cesar
If you want to know if you are in the main thread, you could maybe try:
如果你想知道你是否在主线程中，你可以尝试：
Context c = **Get a Context**;
Thread.currentThread() == c.getMainLooper().getThread();
Of course, I could be wrong, and this could totally blow your app up.
当然，我可能是错的，这可能会彻底炸毁你的应用程序。
