The Quickblox Android SDK by Quickblox offers a transition guide of versions along with references to run samples on Android Studio and Eclipse. Push notifications, simple Android custom objects, and simple Android chat are some of the examples available with images and code.
Graphcool has extended its API via a new function: resolver. The resolver function extends the Grapcool API to 3rd party APIs and microservices. Graphcool pitches the function as one of its most powerful tools and expects it to simply integration with authentication services and third party APIs.