What's new in Android Runtime
summary
Android P adds three concrete ART features: CompactDex converts APK Dex into a deduplicated on‑device format that shrinks Dex storage ~11.6% and saves about 12 bytes per method header; compiler optimizations inline and sink Kotlin null‑checks (removing an extra call and a string load) plus better loop/vector intrinsics; and cloud profiles upload JIT profiles, aggregate a small alpha/beta sample into a core profile, and ship it at install to bootstrap optimizations, yielding ~20% average startup improvement (Maps/Docs ~28–33%, Camera ~12.6%).
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chapters (26)
- 0:00Intro
- 0:20What is Art
- 1:12How Art has changed
- 3:43Optimizations
- 5:04Null Check
- 6:09Optimization
- 7:10Memory and Storage
- 8:22Application Review
- 9:26Dex File Contents
- 10:24Compact Dex
- 11:39Dex Processing
- 14:08Efficiency Results
- 14:49Layout Optimizations
- 18:05How does it work
- 20:30Profiles
- 21:59Core Profiles
- 24:38Metadata Files
- 25:32Device Profile
- 26:50Core Profile
- 27:36Core Profile Graph
- 28:39Core Profile Union
- 31:29Are we shipping unnecessary code
- 33:33What is profile code
- 34:43What is hot code
- 35:59Hot code breakdown
- 37:13Summary
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