Android Makefile 文件浅析(一)

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，宏函数“my-dir”由编译系统提供的，用于返回当前路径。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。

3、include $(CLEAR_VARS)
CLEAR_VARS由编译系统提供，指定让GNUMAKEFILE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

4、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

     user: 指该模块只在user版本下才编译

    eng: 指该模块只在eng版本下才编译

    tests: 指该模块只在tests版本下才编译

   optional:指该模块在所有版本下都编译

   LOCAL_MODULE_TAGS:= optional

   LOCAL_MODULE_TAGS ：=user eng tests optional

5、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)

6、编译静态库

#清除java环境变量

include$(CLEAR_VARS)

LOCAL_MODULE_TAGS:= user

#添加aidl文件

LOCAL_SRC_FILES+= src/net/sunniwell/download/aidl/IDownload.aidl

# SDK 版本                

LOCAL_SDK_VERSION:= current

#jar包的名字

LOCAL_MODULE:=DownLoadServerapi               

#编译 DownLoadServerapi  jar包

include $(BUILD_STATIC_JAVA_LIBRARY)

7、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 := DownLoadServerapi 第三方jar包
   
  # 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)

8、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)

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、引用第三方JAR包方式

#引入第三方包

include $(CLEAR_VARS) 

 

# 表示在当前目录下的lib/iptv.jar进行预处理到android jar包的目录中去

 

#LOCAL_PREBUILT_JAVA_LIBRARIES := libiptv:lib/iptv.jar

LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := \

libiptv:lib/iptv.jar 

 

include $(BUILD_MULTI_PREBUILT)

 

需要在编译apk 中进行、并添加

LOCAL_STATIC_JAVA_LIBRARIES := libiptv