Compilers. Dalvik. ART. And everything in between
summary
Walks through how Android moves from Java .class to on-device code: D8 replaces dx and integrates desugaring, producing smaller, faster dex with ~2s faster local builds and ~100–200KB smaller outputs in examples. Explains ART’s JIT/AOT hybrid: device profiles upload to Play Store, shared profiles reduce warmup, and about eight launches yield ~70% hotspot compilation. Covers R8 as a ProGuard replacement that shrinks more aggressively, removing ~2x methods, gives ~10s build wins in tests and remains experimental.
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chapters (7)
- 0:00Introduction to compilers
- 10:23CPU and JVM basics
- 22:49Dalvik and Dex files
- 26:38ART and JIT compilation
- 32:39Build time issues and d8
- 40:26R8 optimization and ProGuard
- 45:04Call to action for developers
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