介紹

Dalvik 是一個 Google 開發的 VM(Virtual Machine)

過程

JIT(Just In Time)

DEX -> dexopt -> .odex(Byte Code) -> VM (Stack-based)

AOT (Ahead Of Time)

DEX -> dex2oat -> .oat(Native Code) -> ART (Register-based)

ART = Android Runtime

 * Java classes converted into DEX bytecode
 * DEX bytecode is independent of device architecture

https://source.android.com/devices/tech/dalvik