Android: call to OpenGL ES API with no current context (logged once per thread)

When I open a WebView in one thread and want to draw somehting in another thread, maybe they conflict when use the opengl. I googled a lot and found many developers accountered with this problem but I didn't find a solution.

Here says "WebView on some devices also yields same errors because it also uses OpenGL ES for rendering."

Here says "Add this to your AndroidManifest.xml : android:hardwareAccelerated="true" ", I tried but failed, it seems this property was supported only after Android3.0.

Here gives another solution , but I don't know how to do with it.

Finally I "sloved" it by delay sometime to run the code that will use opengl which will lead to this problem.

The fact is that I need much knowledge about Opengl and OpenglES.