Annotation Processing
summary
Creates a compile‑time annotation processor (Java APT, run in a separate plain‑Java Gradle module) that generates BundleBinder classes for activities by scanning @BundleBind on classes and @BindValue on fields, writing string‑built or JavaPoet code via the filer and formatting with Google Java Format. Solves a real case of ~200 validated fields by avoiding reflection and runtime cost, supports rounds and incremental edits (rebuild regenerates code), and can block compilation for @InProgress classes by emitting messager errors. Registration uses META‑INF/services.
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chapters (13)
- 0:00Introduction to talk
- 1:27What are annotations
- 3:58Why write custom processors
- 8:14Benefits of code generation
- 13:08Annotation Processing Tool basics
- 16:47Demo setup and Gradle setup
- 26:07Live coding demo start
- 30:22Processor implementation
- 33:12Testing generated code
- 35:23Adding validation logic
- 37:09Renaming fields dynamically
- 38:14Creating in-progress annotation
- 43:00Q&A and closing remarks
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