Java, android - help me understand code please

first, I spend all day finding the answers by myself, with no luck.

So, I am learning开发者_运维问答 to develop for Android. I setup SDK, got everything running. I am also new to java and OOP itself. I have benn programming before, I know several Assemblers and C very well.

So, what I dont really understand is, in every game tutorial, game loop and SurfaceView is started like a new thread. But why? Why to start new thread for this, instead just let it flow from activity start method?

Thanks.

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The article on Painless Threading explains this very well.