Device Fragmentation and Compatibility Questions

Design and engineering practices for supporting a wide range of mobile devices and operating system versions while maintaining a consistent user experience. Topics include strategies for handling different screen sizes and densities, hardware and sensor capability differences, backward compatibility and graceful degradation, runtime capability detection, adaptive layouts and resource qualifiers, conditional feature gating, handling deprecated platform APIs and migration strategies, packaging and build variants, test strategies including device farms and emulators, telemetry to surface device specific issues, and rollout techniques to limit exposure on problematic device segments.