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SubscribeAndroid Treble: Faster Updates and Easier Upgrades - Merck Hung
歡迎來到 https://hackmd.io/c/COSCUP2018 共筆
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Learn More →點擊本頁上方的 開始用 Markdown 一起寫筆記！
手機版請點選上方 按鈕展開議程列表。
什麼是Treble
協助 AOSP 符合 Treble架構，
希望解決版本碎片化
做手機的公司，或是做embed system的比較會用到
從android 7.0之後就有了，是開發Android OS的基礎設施、更加的模組化
解決component之間錯綜複雜的關係
手機廠的客製化，可以寫在 Framework 和 HAL的extension裡。如果有Google要update patch時，可以更新在原始的 Framework 和 HAL 的程式碼中（可以和extension的部份分開）
Treble decouples Android Framework
HAL是Treble 第一關注的
在Treble之前，Android Framework在 build-time時，compile 和連結 HAL
HAL TYPE
Legacy HAL
Conventional HAL
Treble HAL
HIDL files
HAL interface difintion language
Framework call HIDL，HIDL call HAL
和AIDL類似
算是新的語言，像Java，陣列宣告比較接近c++
轉成空的cpp檔，給廠商實作cpp的內容，compile後，實作的部份放到vendor.img裡
Framework-only OTA is now possible
Binderization
Kernal 裡有新的 Hardware binder
古老有個給JAVA 用的 binder
還有一個給 vendor用的 binder
VNDK
Vender NDK
Low Level NDK
把vender的code 和 library，depend 到VNDK，而不是像以前一樣到framework
VNDK Snapshot
Framework更新後，新版本depend 到新版本的 VNDK，不過vender的VNDK還是舊的，可以一起運作下去。
Treblization process
舊HAL更新→build split process→VNDK conversion process→Treblization end
tags:
COSCUP2018android