The Telerik Android SDK by Telerik interacts with the API to create user interface features such as charts, calendars, and lists. To start, developers can study examples available in Android Studio, Eclipse, and Xamarin.
Google recently released Soli Sandbox, an Android app for Project Soli on the Pixel 4 phone. Project Soli, enabled by a dedicated chip on the Pixel 4, allows Pixel 4 owners to interact with their phone via certain gestures. The timing of the app's release is puzzling, given Soli's uncertain future.