(1)Android.mk文件首先需要指定LOCAL_PATH變量，用于查找源文件。由于一般情況下
Android.mk和需要編譯的源文件在同一目錄下，所以定義成如下形式：
LOCAL_PATH:=$(call my-dir)
上面的語句的意思是將LOCAL_PATH變量定義成本文件所在目錄路徑。

(2)Android.mk中可以定義多個編譯模塊，每個編譯模塊都是以include $(CLEAR_VARS)開始
以include $(BUILD_XXX)結束。
include $(CLEAR_VARS)
CLEAR_VARS由編譯系統提供，指定讓GNU MAKEFILE為你清除除LOCAL_PATH以外的所有LOCAL_XXX變量，
如LOCAL_MODULE，LOCAL_SRC_FILES，LOCAL_SHARED_LIBRARIES，LOCAL_STATIC_LIBRARIES等。
include $(BUILD_STATIC_LIBRARY)表示編譯成靜態庫
include $(BUILD_SHARED_LIBRARY)表示編譯成動態庫。
include $(BUILD_EXECUTABLE)表示編譯成可執行程序

(3)Android編譯時會遍歷所有目錄的Android.mk，一旦找到就不再往子目錄查找。需要在上層Android.mk包含子目錄的Andriod.mk
include $(BASE_PATH)/..../Android.mk

(4)舉例如下(frameworks/base/libs/audioflinger/Android.mk)：
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)? 模塊一
ifeq ($(AUDIO_POLICY_TEST),true)
? ENABLE_AUDIO_DUMP := true
endif
LOCAL_SRC_FILES:= \
??? AudioHardwareGeneric.cpp \
??? AudioHardwareStub.cpp \
??? AudioHardwareInterface.cpp
ifeq ($(ENABLE_AUDIO_DUMP),true)
? LOCAL_SRC_FILES += AudioDumpInterface.cpp
? LOCAL_CFLAGS += -DENABLE_AUDIO_DUMP
endif
LOCAL_SHARED_LIBRARIES := \
??? libcutils \
??? libutils \
??? libbinder \
??? libmedia \
??? libhardware_legacy
ifeq ($(strip $(BOARD_USES_GENERIC_AUDIO)),true)
? LOCAL_CFLAGS += -DGENERIC_AUDIO
endif
LOCAL_MODULE:= libaudiointerface
ifeq ($(BOARD_HAVE_BLUETOOTH),true)
? LOCAL_SRC_FILES += A2dpAudioInterface.cpp
? LOCAL_SHARED_LIBRARIES += liba2dp
? LOCAL_CFLAGS += -DWITH_BLUETOOTH -DWITH_A2DP
? LOCAL_C_INCLUDES += $(call include-path-for, bluez)
endif
include $(BUILD_STATIC_LIBRARY)? 模塊一編譯成靜態庫
include $(CLEAR_VARS)? 模塊二
LOCAL_SRC_FILES:=?????????????? \
??? AudioPolicyManagerBase.cpp
LOCAL_SHARED_LIBRARIES := \
??? libcutils \
??? libutils \
??? libmedia
ifeq ($(TARGET_SIMULATOR),true)
?LOCAL_LDLIBS += -ldl
else
?LOCAL_SHARED_LIBRARIES += libdl
endif
LOCAL_MODULE:= libaudiopolicybase
ifeq ($(BOARD_HAVE_BLUETOOTH),true)
? LOCAL_CFLAGS += -DWITH_A2DP
endif
ifeq ($(AUDIO_POLICY_TEST),true)
? LOCAL_CFLAGS += -DAUDIO_POLICY_TEST
endif
include $(BUILD_STATIC_LIBRARY) 模塊二編譯成靜態庫
include $(CLEAR_VARS) 模塊三
LOCAL_SRC_FILES:=?????????????? \
??? AudioFlinger.cpp??????????? \
??? AudioMixer.cpp.arm????????? \
??? AudioResampler.cpp.arm????? \
??? AudioResamplerSinc.cpp.arm? \
??? AudioResamplerCubic.cpp.arm \
??? AudioPolicyService.cpp
LOCAL_SHARED_LIBRARIES := \
??? libcutils \
??? libutils \
??? libbinder \
??? libmedia \
??? libhardware_legacy
ifeq ($(strip $(BOARD_USES_GENERIC_AUDIO)),true)
? LOCAL_STATIC_LIBRARIES += libaudiointerface libaudiopolicybase
? LOCAL_CFLAGS += -DGENERIC_AUDIO
else
? LOCAL_SHARED_LIBRARIES += libaudio libaudiopolicy
endif
ifeq ($(TARGET_SIMULATOR),true)
?LOCAL_LDLIBS += -ldl
else
?LOCAL_SHARED_LIBRARIES += libdl
endif
LOCAL_MODULE:= libaudioflinger
ifeq ($(BOARD_HAVE_BLUETOOTH),true)
? LOCAL_CFLAGS += -DWITH_BLUETOOTH -DWITH_A2DP
? LOCAL_SHARED_LIBRARIES += liba2dp
endif
ifeq ($(AUDIO_POLICY_TEST),true)
? LOCAL_CFLAGS += -DAUDIO_POLICY_TEST
endif
ifeq ($(TARGET_SIMULATOR),true)
??? ifeq ($(HOST_OS),linux)
??????? LOCAL_LDLIBS += -lrt -lpthread
??? endif
endif
ifeq ($(BOARD_USE_LVMX),true)
??? LOCAL_CFLAGS += -DLVMX
??? LOCAL_C_INCLUDES += vendor/nxp
??? LOCAL_STATIC_LIBRARIES += liblifevibes
??? LOCAL_SHARED_LIBRARIES += liblvmxservice
#??? LOCAL_SHARED_LIBRARIES += liblvmxipc
endif
include $(BUILD_SHARED_LIBRARY) 模塊三編譯成動態庫

(5)編譯一個應用程序(APK)
? LOCAL_PATH := $(call my-dir)
? include $(CLEAR_VARS)
???
? # Build all java files in the java subdirectory-->直譯（建立在java子目錄中的所有Java文件）
? LOCAL_SRC_FILES := $(call all-subdir-java-files)
???
? # Name of the APK to build-->直譯（創建APK的名稱）
? LOCAL_PACKAGE_NAME := LocalPackage
???
? # Tell it to build an APK-->直譯（告訴它來建立一個APK）
? include $(BUILD_PACKAGE)

(6)編譯一個依賴于靜態Java庫(static.jar)的應用程序
? LOCAL_PATH := $(call my-dir)
? include $(CLEAR_VARS)
???
? # List of static libraries to include in the package
? LOCAL_STATIC_JAVA_LIBRARIES := static-library
???
? # Build all java files in the java subdirectory
? LOCAL_SRC_FILES := $(call all-subdir-java-files)
???
? # Name of the APK to build
? LOCAL_PACKAGE_NAME := LocalPackage
???
? # Tell it to build an APK
? include $(BUILD_PACKAGE)

(7)編譯一個需要用平臺的key簽名的應用程序
? LOCAL_PATH := $(call my-dir)
? include $(CLEAR_VARS)
???
? # Build all java files in the java subdirectory
? LOCAL_SRC_FILES := $(call all-subdir-java-files)
???
? # Name of the APK to build
? LOCAL_PACKAGE_NAME := LocalPackage
???
? LOCAL_CERTIFICATE := platform
???
? # Tell it to build an APK
? include $(BUILD_PACKAGE)

(8)編譯一個需要用特定key前面的應用程序
? LOCAL_PATH := $(call my-dir)
? include $(CLEAR_VARS)
???
? # Build all java files in the java subdirectory
? LOCAL_SRC_FILES := $(call all-subdir-java-files)
???
? # Name of the APK to build
? LOCAL_PACKAGE_NAME := LocalPackage
???
? LOCAL_CERTIFICATE := vendor/example/certs/app
???
? # Tell it to build an APK
? include $(BUILD_PACKAGE)

(9)添加一個預編譯應用程序
? LOCAL_PATH := $(call my-dir)
? include $(CLEAR_VARS)
???
? # Module name should match apk name to be installed.
? LOCAL_MODULE := LocalModuleName
? LOCAL_SRC_FILES := $(LOCAL_MODULE).apk
? LOCAL_MODULE_CLASS := APPS
? LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)
???
? include $(BUILD_PREBUILT)

(10)添加一個靜態JAVA庫
? LOCAL_PATH := $(call my-dir)
? include $(CLEAR_VARS)
???
? # Build all java files in the java subdirectory
? LOCAL_SRC_FILES := $(call all-subdir-java-files)
???
? # Any libraries that this library depends on
? LOCAL_JAVA_LIBRARIES := android.test.runner
???
? # The name of the jar file to create
? LOCAL_MODULE := sample
???
? # Build a static jar file.
? include $(BUILD_STATIC_JAVA_LIBRARY)

(11)Android.mk的編譯模塊中間可以定義相關的編譯內容，也就是指定相關的變量如下：
LOCAL_AAPT_FLAGS

LOCAL_ACP_UNAVAILABLE?

LOCAL_ADDITIONAL_JAVA_DIR?
?
LOCAL_AIDL_INCLUDES?

LOCAL_ALLOW_UNDEFINED_SYMBOLS?

LOCAL_ARM_MODE?

LOCAL_ASFLAGS?

LOCAL_ASSET_DIR?

LOCAL_ASSET_FILES 在Android.mk文件中編譯應用程序(BUILD_PACKAGE)時設置此變量，表示資源文件，
????????????????? 通常會定義成LOCAL_ASSET_FILES += $(call find-subdir-assets)
?
LOCAL_BUILT_MODULE_STEM??
LOCAL_C_INCLUDES 額外的C/C++編譯頭文件路徑，用LOCAL_PATH表示本文件所在目錄
???????????????? 舉例如下：
???????????????? LOCAL_C_INCLUDES += extlibs/zlib-1.2.3
???????????????? LOCAL_C_INCLUDES += $(LOCAL_PATH)/src?
?
LOCAL_CC 指定C編譯器

LOCAL_CERTIFICATE? 簽名認證

LOCAL_CFLAGS 為C/C++編譯器定義額外的標志(如宏定義)，舉例：LOCAL_CFLAGS += -DLIBUTILS_NATIVE=1
?
LOCAL_CLASSPATH?

LOCAL_COMPRESS_MODULE_SYMBOLS?

LOCAL_COPY_HEADERS install應用程序時需要復制的頭文件，必須同時定義LOCAL_COPY_HEADERS_TO
?
LOCAL_COPY_HEADERS_TO install應用程序時復制頭文件的目的路徑

LOCAL_CPP_EXTENSION 如果你的C++文件不是以cpp為文件后綴，你可以通過LOCAL_CPP_EXTENSION指定C++文件后綴名?
??????????????????? 如：LOCAL_CPP_EXTENSION := .cc
??????????????????? 注意統一模塊中C++文件后綴必須保持一致。

LOCAL_CPPFLAGS 傳遞額外的標志給C++編譯器，如：LOCAL_CPPFLAGS += -ffriend-injection

LOCAL_CXX 指定C++編譯器
?
LOCAL_DX_FLAGS

LOCAL_EXPORT_PACKAGE_RESOURCES

LOCAL_FORCE_STATIC_EXECUTABLE 如果編譯的可執行程序要進行靜態鏈接(執行時不依賴于任何動態庫)，則設置LOCAL_FORCE_STATIC_EXECUTABLE:=true?
????????????????????????????? 目前只有libc有靜態庫形式，這個只有文件系統中/sbin目錄下的應用程序會用到，這個目錄下的應用程序在運行時通常
????????????????????????????? 文件系統的其它部分還沒有加載，所以必須進行靜態鏈接。
?
LOCAL_GENERATED_SOURCES
?
LOCAL_INSTRUMENTATION_FOR

LOCAL_INSTRUMENTATION_FOR_PACKAGE_NAME

LOCAL_INTERMEDIATE_SOURCES

LOCAL_INTERMEDIATE_TARGETS

LOCAL_IS_HOST_MODULE

LOCAL_JAR_MANIFEST

LOCAL_JARJAR_RULES

LOCAL_JAVA_LIBRARIES 編譯java應用程序和庫的時候指定包含的java類庫，目前有core和framework兩種
???????????????????? 多數情況下定義成：LOCAL_JAVA_LIBRARIES := core framework
???????????????????? 注意LOCAL_JAVA_LIBRARIES不是必須的，而且編譯APK時不允許定義(系統會自動添加)
?
LOCAL_JAVA_RESOURCE_DIRS?

LOCAL_JAVA_RESOURCE_FILES?

LOCAL_JNI_SHARED_LIBRARIES?

LOCAL_LDFLAGS 傳遞額外的參數給連接器(務必注意參數的順序)
?
LOCAL_LDLIBS 為可執行程序或者庫的編譯指定額外的庫，指定庫以"-lxxx"格式，舉例：
???????????? LOCAL_LDLIBS += -lcurses -lpthread
???????????? LOCAL_LDLIBS += -Wl,-z,origin?
?
LOCAL_MODULE 生成的模塊的名稱(注意應用程序名稱用LOCAL_PACKAGE_NAME而不是LOCAL_MODULE)

LOCAL_MODULE_PATH 生成模塊的路徑
?
LOCAL_MODULE_STEM?
?
LOCAL_MODULE_TAGS 生成模塊的標記?
?
LOCAL_NO_DEFAULT_COMPILER_FLAGS?

LOCAL_NO_EMMA_COMPILE?

LOCAL_NO_EMMA_INSTRUMENT?

LOCAL_NO_STANDARD_LIBRARIES?

LOCAL_OVERRIDES_PACKAGES?

LOCAL_PACKAGE_NAME APK應用程序的名稱?

LOCAL_POST_PROCESS_COMMAND
?
LOCAL_PREBUILT_EXECUTABLES 預編譯including $(BUILD_PREBUILT)或者$(BUILD_HOST_PREBUILT)時所用,指定需要復制的可執行文件

LOCAL_PREBUILT_JAVA_LIBRARIES?

LOCAL_PREBUILT_LIBS 預編譯including $(BUILD_PREBUILT)或者$(BUILD_HOST_PREBUILT)時所用, 指定需要復制的庫.

LOCAL_PREBUILT_OBJ_FILES?

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES??
?
LOCAL_PRELINK_MODULE 是否需要預連接處理(默認需要，用來做動態庫優化)

LOCAL_REQUIRED_MODULES 指定模塊運行所依賴的模塊(模塊安裝時將會同步安裝它所依賴的模塊)
?
LOCAL_RESOURCE_DIR

LOCAL_SDK_VERSION

LOCAL_SHARED_LIBRARIES 可鏈接動態庫
?
LOCAL_SRC_FILES 編譯源文件

?
LOCAL_STATIC_JAVA_LIBRARIES?

LOCAL_STATIC_LIBRARIES 可鏈接靜態庫?
?
LOCAL_UNINSTALLABLE_MODULE?

LOCAL_UNSTRIPPED_PATH
?
LOCAL_WHOLE_STATIC_LIBRARIES (完整鏈接)指定模塊所需要載入的完整靜態庫(這些靜態庫在鏈接時不允許鏈接器刪除其中無用的代碼)
?
LOCAL_YACCFLAGS
?
OVERRIDE_BUILT_MODULE_PATH

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