Android: mention supported range of OS in the README

[ivan-mogilko]

Need to clearly document the range of os versions/devices that will be supported by our android port (either APK created by the editor, or AGS Player).

[ericoporto]

This is set by the minSdkVersion and targetSdkVersion that we have in the build.gradle files. They are usually updated to track whatever is required by Google Play, (they usually update it here). We currently have minSdkVerion set to 19, which means the minimum would be Android 4.4 in theory.

Btw, despite the name these settings are more like our API versions. Using newer building tools can work with older API targets - up to a point though, newer NDK don't build to older SDK APIs.

[ivan-mogilko]

What about the upper version, is there a limit on that?

I opened this ticket because someone asked why an older AGS APK not installing on a newer phone, and I don't know how to answer this question.

[ericoporto]

There is no upwards limit at the time you build something, this only comes later when a new model is released and brings some incompatibility that may require a newer/different way of doing something.

The particular question is about 3.5.x era, which is before SDL backend and is also before I actually played with Android port more seriously, from memory there could be a number of reasons for this, like using a deprecated and later obsolete API.