This is an Android application that serves as a learning resource for RxJava 2. It contains over 30 example activities demonstrating various RxJava operators (map, flatMap, zip, filter, take, skip, buffer, concat, merge, etc.), Subjects (Publish, Behavior, Replay, Async), and practical patterns like caching with multiple data sources, pagination with PublishProcessor, search with debounce/switchMap, an event bus (RxBus), and networking with AndroidNetworking. The code is written in Java and targets Android API 28 (Android 9). It uses old dependencies (Gradle 3.2.0, RxJava 2.2.2, AndroidX alpha versions) and the build system relies on the deprecated jcenter() repository. The architecture is straightforward: each example is a self-contained Activity that creates an Observable and logs results to a TextView. While the code is functional and educational, it is not production-grade and exhibits significant technical drift due to outdated libraries and practices.