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Android编译系统主要有三种方式：

    1.编译整个Android系统

          cd  /YOUR_Android_Root/ -->进入android工程目录

          source build/envsetup.sh  -->设置编译环境

          make bigfish -j2 -->完整编译

    2.编译子系统 

         mm -->当前目录下要有Android.mk文件

         mmm  subsystem/  -->subsystem文件夹下要有Android.mk文件

         make libbz

    3.编译sdk

         make sdk

Android.mk文件分析：

     packages/apps/Music/Android.mk

LOCAL_PATH:= $(call my-dir)  #宏函数’my-dir’, 由编译系统提供，用于返回当前路径（即包含Android.mk file文件的目录）

include $(CLEAR_VARS)    #CLEAR_VARS由编译系统提供，指定让GNU MAKEFILE为你清除许多LOCAL_XXX变量（例如 LOCAL_MODULE, LOCAL_SRC_FILES, LOCAL_STATIC_LIBRARIES, 等等...),除了LOCAL_PATH。

LOCAL_MODULE_TAGS := optional  #指定当前子项目所属的标签，user eng userdebug optional
ifdef DOLBY_DAP #宏是否定义
LOCAL_JAVA_LIBRARIES += framework_ext
else
LOCAL_STATIC_JAVA_LIBRARIES := libmds
endif #DOLBY_DAP

LOCAL_SRC_FILES := $(call all-java-files-under, src) \
        src/com/android/music/IMediaPlaybackService.aidl  #编译所需源文件

LOCAL_PACKAGE_NAME := Music  #编译APK文件的文件名

LOCAL_PROGUARD_FLAG_FILES := proguard.flags
LOCAL_CERTIFICATE := platform

include $(BUILD_PACKAGE) #编译成APK文件

ifndef DOLBY_DAP
include $(CLEAR_VARS)
LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := libmds:ds.jar  #添加预编译所需java静态库
include $(BUILD_MULTI_PREBUILT)
endif

# Use the folloing include to make our test apk.
include $(call all-makefiles-under,$(LOCAL_PATH))  #调用子目录下的makefile文件即Android.mk

Android补充说明http://www.ibm.com/developerworks/cn/opensource/os-cn-android-build/

build/core/config.mk中定义include $(BUILD_***)

CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk
BUILD_HOST_STATIC_LIBRARY:= $(BUILD_SYSTEM)/host_static_library.mk
BUILD_HOST_SHARED_LIBRARY:= $(BUILD_SYSTEM)/host_shared_library.mk
BUILD_STATIC_LIBRARY:= $(BUILD_SYSTEM)/static_library.mk
BUILD_RAW_STATIC_LIBRARY := $(BUILD_SYSTEM)/raw_static_library.mk
BUILD_SHARED_LIBRARY:= $(BUILD_SYSTEM)/shared_library.mk
BUILD_EXECUTABLE:= $(BUILD_SYSTEM)/executable.mk
BUILD_RAW_EXECUTABLE:= $(BUILD_SYSTEM)/raw_executable.mk
BUILD_HOST_EXECUTABLE:= $(BUILD_SYSTEM)/host_executable.mk
BUILD_PACKAGE:= $(BUILD_SYSTEM)/package.mk
BUILD_PHONY_PACKAGE:= $(BUILD_SYSTEM)/phony_package.mk
BUILD_HOST_PREBUILT:= $(BUILD_SYSTEM)/host_prebuilt.mk
BUILD_PREBUILT:= $(BUILD_SYSTEM)/prebuilt.mk
BUILD_MULTI_PREBUILT:= $(BUILD_SYSTEM)/multi_prebuilt.mk
BUILD_JAVA_LIBRARY:= $(BUILD_SYSTEM)/java_library.mk
BUILD_STATIC_JAVA_LIBRARY:= $(BUILD_SYSTEM)/static_java_library.mk
BUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mk
BUILD_DROIDDOC:= $(BUILD_SYSTEM)/droiddoc.mk
BUILD_COPY_HEADERS := $(BUILD_SYSTEM)/copy_headers.mk
BUILD_NATIVE_TEST := $(BUILD_SYSTEM)/native_test.mk
BUILD_HOST_NATIVE_TEST := $(BUILD_SYSTEM)/host_native_test.mk
BUILD_NOTICE_FILE := $(BUILD_SYSTEM)/notice_files.mk