Refactoring some obsolete functions that generate compilation errors on Android (fix issue #8363)

[JLucasXavier]

I carried out some refactorings in functions that use the jnius library according to Android references. This should resolve issue #8363

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[misl6]

Hi, I see we have multiple references to org.renpy.android.* out there (and quite sure some code is outdated / unused), but we can change all these references?