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 := trueendifLOCAL_SRC_FILES:= / AudioHardwareGeneric.cpp / AudioHardwareStub.cpp / AudioHardwareInterface.cppifeq ($(ENABLE_AUDIO_DUMP),true) LOCAL_SRC_FILES += AudioDumpInterface.cpp LOCAL_CFLAGS += -DENABLE_AUDIO_DUMPendifLOCAL_SHARED_LIBRARIES := / libcutils / libutils / libbinder / libmedia / libhardware_legacyifeq ($(strip $(BOARD_USES_GENERIC_AUDIO)),true) LOCAL_CFLAGS += -DGENERIC_AUDIOendifLOCAL_MODULE:= libaudiointerfaceifeq ($(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)endifinclude $(BUILD_STATIC_LIBRARY) 模块一编译成静态库include $(CLEAR_VARS) 模块二LOCAL_SRC_FILES:= / AudioPolicyManagerBase.cppLOCAL_SHARED_LIBRARIES := / libcutils / libutils / libmediaifeq ($(TARGET_SIMULATOR),true) LOCAL_LDLIBS += -ldlelse LOCAL_SHARED_LIBRARIES += libdlendifLOCAL_MODULE:= libaudiopolicybaseifeq ($(BOARD_HAVE_BLUETOOTH),true) LOCAL_CFLAGS += -DWITH_A2DPendififeq ($(AUDIO_POLICY_TEST),true) LOCAL_CFLAGS += -DAUDIO_POLICY_TESTendifinclude $(BUILD_STATIC_LIBRARY) 模块二编译成静态库include $(CLEAR_VARS) 模块三LOCAL_SRC_FILES:= / AudioFlinger.cpp / AudioMixer.cpp.arm / AudioResampler.cpp.arm / AudioResamplerSinc.cpp.arm / AudioResamplerCubic.cpp.arm / AudioPolicyService.cppLOCAL_SHARED_LIBRARIES := / libcutils / libutils / libbinder / libmedia / libhardware_legacyifeq ($(strip $(BOARD_USES_GENERIC_AUDIO)),true) LOCAL_STATIC_LIBRARIES += libaudiointerface libaudiopolicybase LOCAL_CFLAGS += -DGENERIC_AUDIOelse LOCAL_SHARED_LIBRARIES += libaudio libaudiopolicyendififeq ($(TARGET_SIMULATOR),true) LOCAL_LDLIBS += -ldlelse LOCAL_SHARED_LIBRARIES += libdlendifLOCAL_MODULE:= libaudioflingerifeq ($(BOARD_HAVE_BLUETOOTH),true) LOCAL_CFLAGS += -DWITH_BLUETOOTH -DWITH_A2DP LOCAL_SHARED_LIBRARIES += liba2dpendififeq ($(AUDIO_POLICY_TEST),true) LOCAL_CFLAGS += -DAUDIO_POLICY_TESTendififeq ($(TARGET_SIMULATOR),true) ifeq ($(HOST_OS),linux) LOCAL_LDLIBS += -lrt -lpthread endifendififeq ($(BOARD_USE_LVMX),true) LOCAL_CFLAGS += -DLVMX LOCAL_C_INCLUDES += vendor/nxp LOCAL_STATIC_LIBRARIES += liblifevibes LOCAL_SHARED_LIBRARIES += liblvmxservice# LOCAL_SHARED_LIBRARIES += liblvmxipcendifinclude $(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 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)
(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
