Android Source Code Tree Structure

  

Android Source Code Tree Structure
build/	Build environment setup and makefiles
prebuilt/	Precompiled binaries for building Android, e.g., cross-compilers
dalvik/	Android JVM
framework/	Android platform layer (system libraries and Java components)
packages/	Standard Android Java applications and components
development/	Android reference applications and tools for developers
external/	Non-Android-specific Open Source projects required for Android
system/	Android system (utilities and libraries, fastboot, logcat, liblog)
bionic/	Android C library
kernel/	Linux kernel
hardware/	HAL (audio, sensors) and Qualcomm specific hardware wrappers
vendor/qcom/	Qualcomm target definitions, e.g., msm7201a_surf
vendor/qcom-proprietary/	Qualcomm-proprietary components, for example, MM, QCRIL, etc.
symbols/	Symbols for all target binaries
out/	Built files created by user
out/host/	Host executables created by the Android build
out/target/product/*/	appsboot*.mbn: Applications boot loader boot.img: Android boot image (Linux kernel + root FS) system.img: Android components (/system) userdata.img: Android development applications and database root/: Root FS directory, which compiles into ramdisk.img and merged into boot.img system/: System FS directory, which compiles into system.img obj/: Intermediate object files obj/ include/: Compiled include files from components obj/lib/ obj/STATIC_LIBRARIES/ obj/SHARED_LIBRARIES/ obj/EXECUTABLES/ obj/APPS/