Enable GameActivity

[nicoburns]

We probably can't merge this as-is. But putting this up to track version of CLI that can compile Blitz with GameActivity.

[chtpl]

can you explain the context a bit more please? what is this GameActivity necessary for?

[nicoburns]

Along with NativeActivity, it's one of two Android Activities that Google provides for native code (i.e. C/C++/Rust) Android apps to use: https://developer.android.com/games/agdk/game-activity. Compared to NativeActivity it provides more advanced functionality.

For Dioxus Native on Android we need to use either NativeActivity, GameActivity, or build our own similar to https://github.com/rust-mobile/android-view. We probably want to do the latter eventually, but getting that right is tricky. In the short-term, GameActivity provides more functionality than NativeActivity.

[chtpl]

I'm not familiar with android development - what is the purpose of these Activity things?

[nicoburns]

They are the entry point for Android Apps. The OS calls methods on them at various points in the apps lfiecycle.