YCAppTool

YCAppTool is a large Android reference project demonstrating how a growing application can be reorganized into a layered component architecture. It separates infrastructure, reusable functionality, business features, and the main application shell to reduce coupling between teams and modules. The project explores routing, interface-based communication, SPI, reflection, lifecycle initialization, and dependency management between components. Its shared libraries cover storage, logging, permissions, file handling, caching, task scheduling, application state, and other common Android needs. Functional modules add capabilities such as QR scanning, localization, timers, monitoring, media, WebView, and server integration. Extensive documentation explains architectural evolution, common migration problems, dependency pitfalls, stability practices, and diagnostic tooling.