build_native.py文件分析(2)

 def build(ndk_build_param,android_platform,build_mode):

     ////获取ndk_root -- NDK_ROOT = os.environ['NDK_ROOT']
     ndk_root = check_environment_variables() //获取ndk_root
     sdk_root = None
     select_toolchain_version() //选择编译工具版本

     //获取当前目录
     current_dir = os.path.dirname(os.path.realpath(__file__))

     //获取cocos_root库根目录，这个因为我们创建工程时拷贝了
     //库源码，所以cocos_root目录使用的是当前目录相对目录
     //如果我们的工程和库相对位置不是这样的，那我们只需要
     //把此处修改一些就可以了。
     //例如cocos_root = os.path.join("E:\otherpro\cocos2d-x-3.0\project\starGame\wipeStar\cocos2d")
     cocos_root = os.path.join(current_dir, "../cocos2d")

     //android 工程的根目录
     app_android_root = current_dir

     //拷贝资源文件，即把Resources -->> assets
     copy_resources(app_android_root)

     if android_platform is not None:
                                 //获取SDK路径 --  SDK_ROOT = os.environ['ANDROID_SDK_ROOT']
                 sdk_root = check_environment_variables_sdk()
                 if android_platform.isdigit():
                         android_platform = 'android-'+android_platform
                 else:
                         print 'please use vaild android platform'
                         exit(1)

     if build_mode is None:
           build_mode = 'debug'
     elif build_mode != 'release':
         build_mode = 'debug'

     do_build(cocos_root, ndk_root, app_android_root,ndk_build_param,sdk_root,android_platform,build_mode)

     -->>do_build分析：

     def do_build(cocos_root, ndk_root, app_android_root,ndk_build_param,sdk_root,android_platform,build_mode):

             //得到NDK下ndk-build的路径
         ndk_path = os.path.join(ndk_root, "ndk-build")

         # windows should use ";" to seperate module paths
         platform = sys.platform
         //生成ndk_module_path参数，也就是执行ndk-build是需要NDK_MODULE_PATH路径，
         //这里我们也可以根据自己的需求修改

         if platform == 'win32':
         ndk_module_path = 'NDK_MODULE_PATH=%s;%s/external;%s/cocos' % (cocos_root, cocos_root, cocos_root)
         else:
         ndk_module_path = 'NDK_MODULE_PATH=%s:%s/external:%s/cocos' % (cocos_root, cocos_root, cocos_root)

         num_of_cpu = get_num_of_cpu()

         //根据传进来的参数，生成编译命令，ndk_build_param(我们执行脚本时-n指定的参数)
         //其实这个参数都是传给ndk-build命令的。
         if ndk_build_param == None:
         command = '%s -j%d -C %s %s' % (ndk_path, num_of_cpu, app_android_root, ndk_module_path)
         else:
         command = '%s -j%d -C %s %s %s' % (ndk_path, num_of_cpu, app_android_root, ''.join(str(e) for e in ndk_build_param), ndk_module_path)
         if os.system(command) != 0:
         raise Exception("Build dynamic library for project [ " + app_android_root + " ] fails!")
         elif android_platform is not None:
           sdk_tool_path = os.path.join(sdk_root, "tools/android")
           cocoslib_path = os.path.join(cocos_root, "cocos/2d/platform/android/java")
           command = '%s update lib-project -t %s -p %s' % (sdk_tool_path,android_platform,cocoslib_path)
           if os.system(command) != 0:
               raise Exception("update cocos lib-project [ " + cocoslib_path + " ] fails!")
           command = '%s update project -t %s -p %s -s' % (sdk_tool_path,android_platform,app_android_root)
           if os.system(command) != 0:
               raise Exception("update project [ " + app_android_root + " ] fails!")
           buildfile_path = os.path.join(app_android_root, "build.xml")
           command = 'ant clean %s -f %s -Dsdk.dir=%s' % (build_mode,buildfile_path,sdk_root)

           //执行命令
           os.system(command)

来自：http://blog.csdn.net/tianxiawuzhei/article/details/44984217