The Pusher Websocket Android SDK by Pusher, although a Java platform, is designed to optimize interactions with Android mobile applications. Developers can work with the SDK when integrating the Pusher Notifications API or the Pusher HTTP API. The SDK’s documentation provides the installation link of Gradle dependency.
Yelp added GraphQL support for its Fusion API. GraphQL, a graph query language, allows developers to request specific data in a single query, rather than multiple API calls through the API. GraphQL is currently in Beta. To use with Yelp, developers need to join Yelp's new Developer Beta Program.