(1)Android.mk文件首先需要指定LOCAL_PATH變量，用於查找來源文件。由於一般情況下
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式
(3)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
(4)編譯一個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)
(5)編譯一個依賴於靜態Java庫(static.jar)的應用程式
- 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)編譯一個需要用平台的key簽名的應用程式
- 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)編譯一個需要用特定key前面的應用程式
- 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)添加一個預編譯應用程式
- 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)
(10)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：
[code]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文件中編譯應用程式(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誌(如宏定義)，舉例：LOCAL_CFLAGS += -DLIBUTILS_NATIVE=1
LOCAL_CLASSPATH
LOCAL_COMPRESS_MODULE_SYMBOLS
LOCAL_COPY_HEADERS //install應用程式時需要複製的頭文件，必須同時定義LOCAL_COPY_HEADERS_TO
LOCAL_COPY_HEADERS_TO //install應用程式時複製頭文件的目的路徑
LOCAL_CPP_EXTENSION //如果你的C++文件不是以cpp為文件尾碼，你可以通過LOCAL_CPP_EXTENSION//指定C++文件尾碼名
如：LOCAL_CPP_EXTENSION := .cc
注意統一模塊中C++文件尾碼必須保持一致。
LOCAL_CPPFLAGS //傳遞額外的標誌給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式要進行靜態連結(執行時不依賴於任何動態庫)，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目錄下的應用程式會用到，這個目錄下的應用程式在運行時通常
//文件系統的其它部分還沒有加載，所以必須進行靜態連結。
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應用程式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 //為可執行程式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(注意應用程式名稱用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應用程式的名稱
LOCAL_POST_PROCESS_COMMAND
LOCAL_PREBUILT_EXECUTABLES //預編譯including $(BUILD_PREBUILT)或者$(BUILD_HOST_PREBUILT)時所用,指定需要複製的可執行文件
LOCAL_PREBUILT_JAVA_LIBRARIES
LOCAL_PREBUILT_LIBS //預編譯including $(BUILD_PREBUILT)或者$(BUILD_HOST_PREBUILT)時所用, 指定需要複製的庫.
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
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