Games Development

Basic4android performance is similar to Java performance in most cases.
Creating a high end graphics game is a difficult task in any environment.

By design, the developer code runs in the main thread. Libraries code run in background threads (if the task requires it).
You will need to create a library for SurfaceView and either write the graphics code with a library using background threads or use Agraham's threading library.

Library code is automically in its own thread?

Library code is automically in its own thread?

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No. But there are some features in the internal framework to help building multithreaded libraries (though you must have a good knowledge for Java and multithreading).