Unity: Android "main" (UI) thread

Questions & Answers
1

All Android apps have a “Main” thread that handles all the UI. This is how the Android OS tests if an app is responsive or not. (see more here: Android Developers Blog: Painless threading )

I’m sometimes getting “Application Not Responding” on my app, which appears to be originating in java plugins, so I need to know a few things about Unity.

My questions are:

Which android thread does the Unity engine run on?

I know that all unity script code runs on a single thread; is this the same thread as the engine? Is it the “main” android thread?

When calls are made to native java android plugins, does it run the java code in a different thread? (It seems to be asynchronous as near as I can tell, but then it doesn’t make any sense to me how the java plugin could be on the main thread, as is shown in the ANR report)

2

Bitter answered this in the forum ( http://forum.unity3d.com/threads/unity-android-main-ui-thread.174553/ )

“Unity is using it’s own threads to do the processing required by the engine. It’s not entirely true that unity scripting is bound to be single threaded - but yes, if you call into java from a unity script it will be the same thread executing that java function as were executing the script.”

3

@cowlinator , You might find AndroidJavaRunnable useful.