Android Modularization That Holds Up: 5 Lessons for Large Codebases
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Effective Android modularization is about reducing the cost of change, not just splitting code into folders. Five practical lessons cover: designing modules around change boundaries rather than layer aesthetics; enforcing a predictable dependency direction with a clear composition root in :app; crossing feature boundaries through small stable contracts (shared state, API modules, or navigation callbacks) instead of direct feature-to-feature dependencies; using Gradle convention plugins to make the intended architecture the default path; and automating architecture rule enforcement via graph assertions and CI checks so violations fail fast rather than silently becoming the new norm. A practical audit approach is also suggested: trace one recent feature change through the system to find the first uncomfortable answer and fix that first.
