如果大家有留意的话，就知道现在很流行的 愤怒的小鸟 的物理引擎是使用了Box2D,那么如何将这好东西移植到Android上呢？在网上找了一遍，发现资料还是少得可怜，于是自己研究研究一下，遇到问题就google一下~

其实用ndk编译Box2D，无非就是那么几个问题:

Box2D/Common/b2Math.h:27:18: error: limits: No such file or directory

Box2D/Collision/b2BroadPhase.h:25:21: error: algorithm: No such file or directory

Box2D/Dynamics/b2Body.h:24:18: error: memory: No such file or directory

Box2D/Common/b2Math.h:39: error: 'numeric_limits' is not a member of 'std'

Box2D/Common/b2Math.h:39: error: '::infinity' has not been declared

Box2D/Collision/b2BroadPhase.h:207: error: 'sort' is not a member of 'std'

Box2D/Common/b2BlockAllocator.cpp:20:

android/android-ndk-r5b/sources/cxx-stl/system/include/cstdlib:53: error: '::clearenv' has not been declared

Box2D/Common/b2Settings.cpp:20:

Box2D/Dynamics/b2Body.cpp:162: error: no matching function for call to 'operator new(unsigned int, void*&)'

:0: note: candidates are: void* operator new(unsigned int)

将这些问题逐个击破就可以了。

我使用的测试例子是Box2D自带的HelloWorld

那Android.mk就这样写了

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := helloworld

LOCAL_ARM_MODE := arm

LOCAL_SRC_FILES := HelloWorld.cpp

LOCAL_C_INCLUDES += $(LOCAL_PATH) \

$(LOCAL_PATH)/Box2D \

$(LOCAL_PATH)/Collision \

$(LOCAL_PATH)/Common \

$(LOCAL_PATH)/Dynamics \

$(LOCAL_PATH)/Rope

#LOCAL_LDIBS := -lstdc++

LOCAL_STATIC_LIBRARIES := libbox2d

include $(BUILD_EXECUTABLE)

##################################

include $(call all-makefiles-under,$(LOCAL_PATH))

目的是生成 一个可执行的文件。

以下是编译Box2D的文件，目的是生成一个静态连接库:

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

BOX2D_SRC_FILES += \

Collision/b2BroadPhase.cpp \

Collision/b2CollideCircle.cpp \

Collision/b2CollideEdge.cpp \

Collision/b2CollidePolygon.cpp \

Collision/b2Collision.cpp \

Collision/b2Distance.cpp \

Collision/b2DynamicTree.cpp \

Collision/b2TimeOfImpact.cpp \

Collision/Shapes/b2ChainShape.cpp \

Collision/Shapes/b2CircleShape.cpp \

Collision/Shapes/b2EdgeShape.cpp \

Collision/Shapes/b2PolygonShape.cpp \

Common/b2BlockAllocator.cpp \

Common/b2Draw.cpp \

Common/b2Math.cpp \

Common/b2Settings.cpp \

Common/b2StackAllocator.cpp \

Common/b2Timer.cpp \

Dynamics/b2Body.cpp \

Dynamics/b2ContactManager.cpp \

Dynamics/b2Fixture.cpp \

Dynamics/b2Island.cpp \

Dynamics/b2World.cpp \

Dynamics/b2WorldCallbacks.cpp \

Dynamics/Contacts/b2ChainAndCircleContact.cpp \

Dynamics/Contacts/b2ChainAndPolygonContact.cpp \

Dynamics/Contacts/b2CircleContact.cpp \

Dynamics/Contacts/b2Contact.cpp \

Dynamics/Contacts/b2ContactSolver.cpp \

Dynamics/Contacts/b2EdgeAndCircleContact.cpp \

Dynamics/Contacts/b2EdgeAndPolygonContact.cpp \

Dynamics/Contacts/b2PolygonAndCircleContact.cpp \

Dynamics/Contacts/b2PolygonContact.cpp \

Dynamics/Joints/b2DistanceJoint.cpp \

Dynamics/Joints/b2FrictionJoint.cpp \

Dynamics/Joints/b2GearJoint.cpp \

Dynamics/Joints/b2Joint.cpp \

Dynamics/Joints/b2MouseJoint.cpp \

Dynamics/Joints/b2PrismaticJoint.cpp \

Dynamics/Joints/b2PulleyJoint.cpp \

Dynamics/Joints/b2RevoluteJoint.cpp \

Dynamics/Joints/b2RopeJoint.cpp \

Dynamics/Joints/b2WeldJoint.cpp \

Dynamics/Joints/b2WheelJoint.cpp \

Rope/b2Rope.cpp

LOCAL_MODULE := box2d

LOCAL_C_INCLUDES += $(LOCAL_PATH) \

$(LOCAL_PATH)/../

LOCAL_SRC_FILES := $(BOX2D_SRC_FILES)

include $(BUILD_STATIC_LIBRARY)

好了，准备的功夫就绪了，ndk-build吧。

然后就XXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXX

一堆错误。

毕竟ndk编译还是有一点不足，那么我们就要对源码进行移向的修改，修改记录如下:

/***************************************************************************************************/

Box2D/Common/b2Math.h 注释#include

//float32 infinity = std::numeric_limits::infinity(); 修改为以下

float32 infinity = INFINITY;

/***************************************************************************************************/

Box2D/Collision/b2BroadPhase.h 注释#include

// 添加一个头文件 #include

// 添加一个方法

static int b2PairQSORTLessThan (const void*element1, const void*element2)

{

b2Pair *pair1 = (b2Pair*)element1;

b2Pair *pair2 = (b2Pair*)element2;

if (pair1->proxyIdA < pair2->proxyIdA)

return -1;

else if (pair1->proxyIdA > pair2->proxyIdA)

return 1;

else {

if (pair1->proxyIdB < pair2->proxyIdB)

return -1;

else if (pair1->proxyIdB > pair2->proxyIdB)

return 1;

}

return 0;

}

//std::sort(m_pairBuffer, m_pairBuffer + m_pairCount, b2PairLessThan);修改为以下

qsort (m_pairBuffer, m_pairCount, sizeof (b2Pair), b2PairQSORTLessThan);

/***************************************************************************************************/

Box2D/Dynamics/b2Body.h

注释#include

添加头文件 #include

/***************************************************************************************************/

Box2D/Common/b2BlockAllocator.cpp //#include 注释掉

// 添加头文件

#include

//#include 注释掉

// 添加头文件

#include

/***************************************************************************************************/

Box2D/Common/b2Settings.cpp

//#include 注释掉

// 添加头文件

#include

/***************************************************************************************************/

Box2D/Dynamics/b2Body.cpp

// 添加头文件

#include

/***************************************************************************************************/

好了，好了，再编译一下吧。一切顺利了吧~

最后会生成 helloworld的可执行文件，将它push 到模拟器运行一下，好了，没问题了~

修改过的源码下载地址 :

个人是比较懒了，不想多说了。^^