Annotation Processing in Android
summary
Explains how Java compile‑time annotation processing (JSR 269) actually works: use AbstractProcessor with ProcessingEnvironment and RoundEnvironment, generate source via JavaPoet, package the processor in META-INF/services, and split annotations and processor into plain Java Gradle modules (use apt) to run on Android. Tests are hard but Google’s compiled-testing + Truth lets you assert generated sources compile. Covers Gradle javadoc quirks, warns about multiple processing rounds, and cites real users: Butter Knife, Dagger(2), Parceler and Realm, which generates many proxies successfully.
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