android编译系统的makefile文件Android.mk写法如下

(1)Android.mk文件首先需要指定LOCAL_PATH变量，用于查找源文件。由于一般情况下

Android.mk和需要编译的源文件在同一目录下，所以定义成如下形式：

LOCAL_PATH:=$(call my-dir)

上面的语句的意思是将LOCAL_PATH变量定义成本文件所在目录路径。

(2)Android.mk中可以定义多个编译模块，每个编译模块都是以include $(CLEAR_VARS)开始

以include $(BUILD_XXX)结束。

include $(CLEAR_VARS)

CLEAR_VARS由编译系统提供，指定让GNU MAKEFILE为你清除除LOCAL_PATH以外的所有LOCAL_XXX变量，

如LOCAL_MODULE，LOCAL_SRC_FILES，LOCAL_SHARED_LIBRARIES，LOCAL_STATIC_LIBRARIES等。

include $(BUILD_STATIC_LIBRARY)表示编译成静态库

include $(BUILD_SHARED_LIBRARY)表示编译成动态库。

include $(BUILD_EXECUTABLE)表示编译成可执行程序

(3)举例如下(frameworks/base/libs/audioflinger/Android.mk)：

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)  模块一

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)  模块一编译成静态库

include $(CLEAR_VARS)  模块二

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) 模块二编译成静态库

include $(CLEAR_VARS) 模块三

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) 模块三编译成动态库

(4)编译一个应用程序(APK)

  LOCAL_PATH := $(call my-dir)

  include $(CLEAR_VARS)

  # Build all java files in the java subdirectory-->直译（建立在java子目录中的所有Java文件）

  LOCAL_SRC_FILES := $(call all-subdir-java-files)

  # Name of the APK to build-->直译（创建APK的名称）

  LOCAL_PACKAGE_NAME := LocalPackage

  # Tell it to build an APK-->直译（告诉它来建立一个APK）

  include $(BUILD_PACKAGE)

(5)编译一个依赖于静态Java库(static.jar)的应用程序

  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)

(6)编译一个需要用平台的key签名的应用程序

  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)

(7)编译一个需要用特定key前面的应用程序

  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)

(8)添加一个预编译应用程序

  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)

(9)添加一个静态JAVA库

  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)

(10)Android.mk的编译模块中间可以定义相关的编译内容，也就是指定相关的变量如下：

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文件中编译应用程序(BUILD_PACKAGE)时设置此变量，表示资源文件，

                  通常会定义成LOCAL_ASSET_FILES += $(call find-subdir-assets)

LOCAL_BUILT_MODULE_STEM  

LOCAL_C_INCLUDES 额外的C/C++编译头文件路径，用LOCAL_PATH表示本文件所在目录

                 举例如下：

                 LOCAL_C_INCLUDES += extlibs/zlib-1.2.3

                 LOCAL_C_INCLUDES += $(LOCAL_PATH)/src

LOCAL_CC 指定C编译器

LOCAL_CERTIFICATE  签名认证

LOCAL_CFLAGS 为C/C++编译器定义额外的标志(如宏定义)，举例：LOCAL_CFLAGS += -DLIBUTILS_NATIVE=1

LOCAL_CLASSPATH

LOCAL_COMPRESS_MODULE_SYMBOLS

LOCAL_COPY_HEADERS install应用程序时需要复制的头文件，必须同时定义LOCAL_COPY_HEADERS_TO

LOCAL_COPY_HEADERS_TO install应用程序时复制头文件的目的路径

LOCAL_CPP_EXTENSION 如果你的C++文件不是以cpp为文件后缀，你可以通过LOCAL_CPP_EXTENSION指定C++文件后缀名

                    如：LOCAL_CPP_EXTENSION := .cc

                    注意统一模块中C++文件后缀必须保持一致。

LOCAL_CPPFLAGS 传递额外的标志给C++编译器，如：LOCAL_CPPFLAGS += -ffriend-injection

LOCAL_CXX 指定C++编译器

LOCAL_DX_FLAGS

LOCAL_EXPORT_PACKAGE_RESOURCES

LOCAL_FORCE_STATIC_EXECUTABLE 如果编译的可执行程序要进行静态链接(执行时不依赖于任何动态库)，则设置LOCAL_FORCE_STATIC_EXECUTABLE:=true

                              目前只有libc有静态库形式，这个只有文件系统中/sbin目录下的应用程序会用到，这个目录下的应用程序在运行时通常

                              文件系统的其它部分还没有加载，所以必须进行静态链接。

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 编译java应用程序和库的时候指定包含的java类库，目前有core和framework两种

                     多数情况下定义成：LOCAL_JAVA_LIBRARIES := core framework

                     注意LOCAL_JAVA_LIBRARIES不是必须的，而且编译APK时不允许定义(系统会自动添加)

LOCAL_JAVA_RESOURCE_DIRS

LOCAL_JAVA_RESOURCE_FILES

LOCAL_JNI_SHARED_LIBRARIES

LOCAL_LDFLAGS 传递额外的参数给连接器(务必注意参数的顺序)

LOCAL_LDLIBS 为可执行程序或者库的编译指定额外的库，指定库以"-lxxx"格式，举例：

             LOCAL_LDLIBS += -lcurses -lpthread

             LOCAL_LDLIBS += -Wl,-z,origin

LOCAL_MODULE 生成的模块的名称(注意应用程序名称用LOCAL_PACKAGE_NAME而不是LOCAL_MODULE)

LOCAL_MODULE_PATH 生成模块的路径

LOCAL_MODULE_STEM

LOCAL_MODULE_TAGS 生成模块的标记

LOCAL_NO_DEFAULT_COMPILER_FLAGS

LOCAL_NO_EMMA_COMPILE

LOCAL_NO_EMMA_INSTRUMENT

LOCAL_NO_STANDARD_LIBRARIES

LOCAL_OVERRIDES_PACKAGES

LOCAL_PACKAGE_NAME APK应用程序的名称

LOCAL_POST_PROCESS_COMMAND

LOCAL_PREBUILT_EXECUTABLES 预编译including $(BUILD_PREBUILT)或者$(BUILD_HOST_PREBUILT)时所用,指定需要复制的可执行文件

LOCAL_PREBUILT_JAVA_LIBRARIES

LOCAL_PREBUILT_LIBS 预编译including $(BUILD_PREBUILT)或者$(BUILD_HOST_PREBUILT)时所用, 指定需要复制的库.

LOCAL_PREBUILT_OBJ_FILES

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES  

LOCAL_PRELINK_MODULE 是否需要预连接处理(默认需要，用来做动态库优化)

LOCAL_REQUIRED_MODULES 指定模块运行所依赖的模块(模块安装时将会同步安装它所依赖的模块)

LOCAL_RESOURCE_DIR

LOCAL_SDK_VERSION

LOCAL_SHARED_LIBRARIES 可链接动态库

LOCAL_SRC_FILES 编译源文件

LOCAL_STATIC_JAVA_LIBRARIES

LOCAL_STATIC_LIBRARIES 可链接静态库

LOCAL_UNINSTALLABLE_MODULE

LOCAL_UNSTRIPPED_PATH

LOCAL_WHOLE_STATIC_LIBRARIES 指定模块所需要载入的完整静态库(这些精通库在链接是不允许链接器删除其中无用的代码)

LOCAL_YACCFLAGS

OVERRIDE_BUILT_MODULE_PATH