Android Java Libraries in UE4 Game (OUYA SDK, Google Play Game Services, etc.)

I put my JAR libraries in the UnrealEngine\Engine\Build\Android\Java\libs folder.

You can put assets and res in your ProjectName\Build\Android subfolder. So maybe you could drop a jar in ProjectName\Build\Android\libs.

Then you would need to add JNI to your C++ code. And I didn’t do it that way because it was adding 20 minutes to my compile times. Adding to the engine code was much faster.