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Question by Genom · Dec 13, 2014 at 02:30 AM · androidcrashthreading

create an AndroidJavaObject within a Thread

Hi, while usign System.Threading library for unity I find that this code makes the app to crash in Android:

Task.Factory.StartNew(() => { var hubConnection = new AndroidJavaObject("microsoft.aspnet.signalr.client.hubs.Prueba"); });

(Prueba is an empty class with single property, created for the purpose just to check the HubConnection was not messing up with threads)

Any idea why?

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Answer by liortal · Dec 14, 2014 at 09:59 AM

Unity is generally not so well suited for multithreading (you have to be careful with what you do).

Regarding your issue, without seeing the exact error message, I assume this is because the thread you created is not attached to any Java VM.

From the context of your new thread, call:

 AndroidJNI.AttachCurrentThread();

See the documentation for this method here: http://docs.unity3d.com/ScriptReference/AndroidJNI.AttachCurrentThread.html

*BTW - I did not know you could use TPL (Task Parallel Library) in Unity... It uses an older Mono that did not have those libraries...

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