Android: Create examples/templates for interacting with the Java side

After http://qt-project.org/forums/viewthread/45673/

Android controls in 5.4 become good enough for actually building apps (unless you need a web view), but many (most?) of real apps will need an interaction with the rest of the system the native way. The most common/important cases are probably Android sharing to/from app, login/signup (with Twitter/Facebook/G+) and maybe accessing the system databases of images/thumbnails/music. All of that is already possible via JNI, but:

1. Default QtC wizard (in 5.3 at least) generates Java code into a build directory that makes it hard to store, modify and maintain
2. Since Java world is not native for Qt people, proceeding without examples is hard

So it would be great and would actually help a lot with creating real Android apps to have some copy-pastable examples on the topics above and/or similar ones + to make Java code a part of the main source tree.

P.S.
Same is needed for iOS certainly, but there the lack of Controls is way bigger pain point for now, so not raising the issue yet. Also there are people who seem to be able to integrate native facebook logins on iOS (and Android?) already now, so they might be able/eager to share the code - www.cutehacks.com/blog/2014/06/06/using-qt-to-build-an-omi-app-for-ios-and-android