droidparts/droidparts — Open Source Java with 767 Stars

a carefully crafted Android framework that includes:

DI - injection of Views, Fragments, Services, etc.
ORM - efficient persistence utilizing Cursors & fluent API.
EventBus for posting event notifications.
Simple JSON (de)serialization capable of handling nested objects.
Improved AsyncTask & IntentService with Exceptions & result reporting support.
Logger that figures out tag itself & logs any object.
RESTClient for GETting, PUTting, POSTing, DELETing & InputStream-getting, also speaks JSON.
ImageFetcher to asynchronously attach images to ImageViews, with caching, cross-fade & transformation support.
Numerous Utils.

<dependency>
  <groupId>org.droidparts</groupId>
  <artifactId>droidparts</artifactId>
  <version>${version.from.jar.above}</version>
</dependency>

or Gradle:

droidparts