cocos2d 跨平台原理 以及android.mk编译的入口

在android工程下面jni/hellocpp/main.cpp里面是cocos2d c++的入口。

一路跟踪Cocos2dxActivity.java找到Cocos2dxRenderer.java

public void onSurfaceCreated(final GL10 pGL10,final EGLConfig pEGLConfig) {
        Cocos2dxRenderer.nativeInit(this.mScreenWidth,this.mScreenHeight);
        this.mLastTickInNanoSeconds = System.nanoTime();
        mNativeInitCompleted = true;
    }

其中nativeInit方法在cocos/platform/android/javaactivity-android.cpp可以看到

java层是怎么能够找的到javaactivity-android.cpp这个文件呢？

在obj目录下可以看到javaactivity-android.o文件

但是这个文件在什么时候在哪里编译的呢？

右键工程可以看到会执行目录下的build_native.py

在build_native.py里面可以看到一段函数

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

    ndk_path = os.path.join(ndk_root,"ndk-build")

    num_of_cpu = get_num_of_cpu()
	
    if ndk_build_param == None:
        command = '%s -j%d -C %s NDK_DEBUG=%d' % (ndk_path,num_of_cpu,build_mode=='debug')
    else:
        command = '%s -j%d -C %s NDK_DEBUG=%d %s' % (ndk_path,build_mode=='debug',' '.join(str(e) for e in ndk_build_param))
    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/platform/android/java")
    	  command = '%s update lib-project -t %s -p %s' % (sdk_tool_path,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,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)
    	  os.system(command)

xxandroid-ndk-r10cndk-build -j4 -C xxProjectscakeproj.android NDK_DEBUG=0

可以看到关于jni目录下的application.mk和android.mk信息。

可见这就是编译C++文件的入口。

再看android.mk

其中$(call import-module,.)会引入上面add-path下的外部android.mk文件

可以看到cocos目录下有个android.mk文件

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := cocos2dx_internal_static

LOCAL_MODULE_FILENAME := libcocos2dxinternal

LOCAL_SRC_FILES := 
cocos2d.cpp 
2d/CCAction.cpp 
2d/CCActionCamera.cpp 
2d/CCActionCatmullRom.cpp 
2d/CCActionEase.cpp 
2d/CCActionGrid.cpp 
2d/CCActionGrid3D.cpp 
2d/CCActionInstant.cpp 
2d/CCActionInterval.cpp 
2d/CCActionManager.cpp 
2d/CCActionPageTurn3D.cpp 
2d/CCActionProgressTimer.cpp 
2d/CCActionTiledGrid.cpp 
2d/CCActionTween.cpp 
2d/CCAnimation.cpp 
2d/CCAnimationCache.cpp 
2d/CCAtlasNode.cpp 
2d/CCCamera.cpp 
2d/CCClippingNode.cpp 
2d/CCClippingRectangleNode.cpp 
2d/CCComponent.cpp 
2d/CCComponentContainer.cpp 
2d/CCDrawNode.cpp 
2d/CCDrawingPrimitives.cpp 
2d/CCFont.cpp 
2d/CCFontAtlas.cpp 
2d/CCFontAtlasCache.cpp 
2d/CCFontCharMap.cpp 
2d/CCFontFNT.cpp 
2d/CCFontFreeType.cpp 
2d/CCGLBufferedNode.cpp 
2d/CCGrabber.cpp 
2d/CCGrid.cpp 
2d/CCLabel.cpp 
2d/CCLabelAtlas.cpp 
2d/CCLabelBMFont.cpp 
2d/CCLabelTTF.cpp 
2d/CCLabelTextFormatter.cpp 
2d/CCLayer.cpp 
2d/CCLight.cpp 
2d/CCMenu.cpp 
2d/CCMenuItem.cpp 
2d/CCMotionStreak.cpp 
2d/CCNode.cpp 
2d/CCNodeGrid.cpp 
2d/CCParallaxNode.cpp 
2d/CCParticleBatchNode.cpp 
2d/CCParticleExamples.cpp 
2d/CCParticleSystem.cpp 
2d/CCParticleSystemQuad.cpp 
2d/CCProgressTimer.cpp 
2d/CCProtectedNode.cpp 
2d/CCRenderTexture.cpp 
2d/CCScene.cpp 
2d/CCSprite.cpp 
2d/CCSpriteBatchNode.cpp 
2d/CCSpriteFrame.cpp 
2d/CCSpriteFrameCache.cpp 
2d/CCTMXLayer.cpp 
2d/CCFastTMXLayer.cpp 
2d/CCTMXObjectGroup.cpp 
2d/CCTMXTiledMap.cpp 
2d/CCFastTMXTiledMap.cpp 
2d/CCTMXXMLParser.cpp 
2d/CCTextFieldTTF.cpp 
2d/CCTileMapAtlas.cpp 
2d/CCTransition.cpp 
2d/CCTransitionPageTurn.cpp 
2d/CCTransitionProgress.cpp 
2d/CCTweenFunction.cpp 
platform/CCGLView.cpp 
platform/CCFileUtils.cpp 
platform/CCSAXParser.cpp 
platform/CCThread.cpp 
platform/CCImage.cpp 
math/CCAffineTransform.cpp 
math/CCGeometry.cpp 
math/CCVertex.cpp 
math/Mat4.cpp 
math/MathUtil.cpp 
math/Quaternion.cpp 
math/TransformUtils.cpp 
math/Vec2.cpp 
math/Vec3.cpp 
math/Vec4.cpp 
base/CCAutoreleasePool.cpp 
base/CCConfiguration.cpp 
base/CCConsole.cpp 
base/CCData.cpp 
base/CCDataVisitor.cpp 
base/CCDirector.cpp 
base/CCEvent.cpp 
base/CCEventAcceleration.cpp 
base/CCEventCustom.cpp 
base/CCEventDispatcher.cpp 
base/CCEventFocus.cpp 
base/CCEventKeyboard.cpp 
base/CCEventController.cpp 
base/CCEventListener.cpp 
base/CCEventListenerController.cpp 
base/CCEventListenerAcceleration.cpp 
base/CCEventListenerCustom.cpp 
base/CCEventListenerFocus.cpp 
base/CCEventListenerKeyboard.cpp 
base/CCEventListenerMouse.cpp 
base/CCEventListenerTouch.cpp 
base/CCEventMouse.cpp 
base/CCEventTouch.cpp 
base/CCIMEDispatcher.cpp 
base/CCNS.cpp 
base/CCProfiling.cpp 
base/ccRandom.cpp 
base/CCRef.cpp 
base/CCScheduler.cpp 
base/CCScriptSupport.cpp 
base/CCTouch.cpp 
base/CCUserDefault.cpp 
base/CCUserDefault-android.cpp 
base/CCValue.cpp 
base/TGAlib.cpp 
base/ZipUtils.cpp 
base/atitc.cpp 
base/base64.cpp 
base/ccCArray.cpp 
base/ccFPSImages.c 
base/ccTypes.cpp 
base/ccUTF8.cpp 
base/ccUtils.cpp 
base/etc1.cpp 
base/pvr.cpp 
base/s3tc.cpp 
base/CCController.cpp 
base/CCController-android.cpp 
base/ObjectFactory.cpp 
renderer/CCBatchCommand.cpp 
renderer/CCCustomCommand.cpp 
renderer/CCGLProgram.cpp 
renderer/CCGLProgramCache.cpp 
renderer/CCGLProgramState.cpp 
renderer/CCGLProgramStateCache.cpp 
renderer/CCGroupCommand.cpp 
renderer/CCQuadCommand.cpp 
renderer/CCMeshCommand.cpp 
renderer/CCRenderCommand.cpp 
renderer/CCRenderer.cpp 
renderer/CCTexture2D.cpp 
renderer/CCTextureAtlas.cpp 
renderer/CCTextureCache.cpp 
renderer/ccGLStateCache.cpp 
renderer/ccShaders.cpp 
renderer/CCVertexIndexBuffer.cpp 
renderer/CCVertexIndexData.cpp 
renderer/CCPrimitive.cpp 
renderer/CCPrimitiveCommand.cpp 
renderer/CCTrianglesCommand.cpp 
deprecated/CCArray.cpp 
deprecated/CCSet.cpp 
deprecated/CCString.cpp 
deprecated/CCDictionary.cpp 
deprecated/CCDeprecated.cpp 
deprecated/CCNotificationCenter.cpp 
physics/CCPhysicsBody.cpp 
physics/CCPhysicsContact.cpp 
physics/CCPhysicsJoint.cpp 
physics/CCPhysicsShape.cpp 
physics/CCPhysicsWorld.cpp 
physics/chipmunk/CCPhysicsBodyInfo_chipmunk.cpp 
physics/chipmunk/CCPhysicsContactInfo_chipmunk.cpp 
physics/chipmunk/CCPhysicsJointInfo_chipmunk.cpp 
physics/chipmunk/CCPhysicsShapeInfo_chipmunk.cpp 
physics/chipmunk/CCPhysicsWorldInfo_chipmunk.cpp 
../external/ConvertUTF/ConvertUTFWrapper.cpp 
../external/ConvertUTF/ConvertUTF.c 
../external/tinyxml2/tinyxml2.cpp 
../external/unzip/ioapi_mem.cpp 
../external/unzip/ioapi.cpp 
../external/unzip/unzip.cpp 
../external/edtaa3func/edtaa3func.cpp 
../external/xxhash/xxhash.c


LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH) 
                    $(LOCAL_PATH)/. 
                    $(LOCAL_PATH)/.. 
                    $(LOCAL_PATH)/platform 
                    $(LOCAL_PATH)/base 
                    $(LOCAL_PATH)/../external 
                    $(LOCAL_PATH)/../external/tinyxml2 
                    $(LOCAL_PATH)/../external/unzip 
                    $(LOCAL_PATH)/../external/chipmunk/include/chipmunk 
                    $(LOCAL_PATH)/../external/xxhash 
                    $(LOCAL_PATH)/../external/nslog

LOCAL_C_INCLUDES := $(LOCAL_PATH) 
                    $(LOCAL_PATH)/. 
                    $(LOCAL_PATH)/platform 
                    $(LOCAL_PATH)/../external 
                    $(LOCAL_PATH)/../external/tinyxml2 
                    $(LOCAL_PATH)/../external/unzip 
                    $(LOCAL_PATH)/../external/chipmunk/include/chipmunk 
                    $(LOCAL_PATH)/../external/edtaa3func 
                    $(LOCAL_PATH)/../external/xxhash 
                    $(LOCAL_PATH)/../external/ConvertUTF 
                    $(LOCAL_PATH)/../external/nslog

LOCAL_EXPORT_LDLIBS := -lGLESv2 
                       -llog 
                       -lz 
                       -landroid

LOCAL_STATIC_LIBRARIES := cocos_freetype2_static
LOCAL_STATIC_LIBRARIES += cocos_png_static
LOCAL_STATIC_LIBRARIES += cocos_jpeg_static
LOCAL_STATIC_LIBRARIES += cocos_tiff_static
LOCAL_STATIC_LIBRARIES += cocos_webp_static
LOCAL_STATIC_LIBRARIES += cocos_chipmunk_static

LOCAL_WHOLE_STATIC_LIBRARIES := cocos2dxandroid_static

# define the macro to compile through support/zip_support/ioapi.c
LOCAL_CFLAGS   :=  -DUSE_FILE32API
LOCAL_CPPFLAGS := -Wno-deprecated-declarations -Wno-extern-c-compat
LOCAL_EXPORT_CFLAGS   := -DUSE_FILE32API
LOCAL_EXPORT_CPPFLAGS := -Wno-deprecated-declarations -Wno-extern-c-compat

ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
LOCAL_ARM_NEON  := true
endif

include $(BUILD_STATIC_LIBRARY)

#==============================================================

include $(CLEAR_VARS)

LOCAL_MODULE := cocos2dx_static
LOCAL_MODULE_FILENAME := libcocos2d

LOCAL_STATIC_LIBRARIES := cocostudio_static
LOCAL_STATIC_LIBRARIES += cocosbuilder_static
LOCAL_STATIC_LIBRARIES += cocos3d_static
LOCAL_STATIC_LIBRARIES += spine_static
LOCAL_STATIC_LIBRARIES += cocos_network_static
LOCAL_STATIC_LIBRARIES += audioengine_static

include $(BUILD_STATIC_LIBRARY)
#==============================================================
$(call import-module,freetype2/prebuilt/android)
$(call import-module,platform/android)
$(call import-module,png/prebuilt/android)
$(call import-module,jpeg/prebuilt/android)
$(call import-module,tiff/prebuilt/android)
$(call import-module,webp/prebuilt/android)
$(call import-module,chipmunk/prebuilt/android)
$(call import-module,3d)
$(call import-module,audio/android)
$(call import-module,editor-support/cocosbuilder)
$(call import-module,editor-support/cocostudio)
$(call import-module,editor-support/spine)
$(call import-module,network)
$(call import-module,ui)
$(call import-module,extensions)
$(call import-module,Box2D)
$(call import-module,curl/prebuilt/android)
$(call import-module,websockets/prebuilt/android)
$(call import-module,protobuf-lite)

$(call import-module,audio/android)

到这里一切就豁然开朗了。

参考链接: http://blog.sina.com.cn/s/blog_4057ab62010197z8.html http://blog.csdn.net/smfwuxiao/article/details/8523087

（编辑：李大同）

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