This unofficial Java library is for Android developers interested in working with App.net. Although the library is still being developed, it currently supports most of App.net's APIs like: post and user endpoints, message and channel endpoints, file creation and retrieval endpoints, and place search. The library is also set up to be used with Android Studio.
Twitter has announced that it is delaying the shutdown of legacy APIs as its new Account Activity API is now generally available to all developers. The legacy APIs, namely the Site Streams and User Streams APIs, as well as Direct Message endpoints, were slated to be turned off on June 19.