The Directus Java SDK simplifies interaction with the Directus managed database when building android apps using the Java language. The SDK communicates with the Directus API. Deployment requires Maven installation. It is currently a beta release.
Google has launched Cloud Firestore a new, fully-managed NoSQL document database for building data-driven mobile and web apps at global scale. Key features include expressive querying, SDKs with offline data access, real-time data synchronization, and automatic, multi-region data replication.