Cocos2d-x C++调用Android弹出提示框

转载请注明地址，谢谢。。

Cocos2d-x中提供了一个JniHelper类来让我们对Jni进行操作。

(PS:弄了一天想自己写代码操作Jni的，但是总是出错，技术差不得不使用Cocos2d-x现成的了)。

我们有一个Android工程 ：CocosDemoAndroid

还有一个Win32工程：Cocos2dDemo.win32

这个是必备的。。。

在C++ Win32工程中有一个Scene，点击按钮调用Jni函数。

void CallJni::getInputCallBack(CCObject* pSender)
{
	g_AndroidPlatform.showDialog();

}

这个 g_AndroidPlatform.showDialog(); 在这个函数里面
使用JniHelper类来使用Jni。

void AndroidPlatform::showDialog()
{
	CCLog("showDialog");

#ifdef ANDROID
	//下面是利用jnihelper类来调用Android Static
	JniMethodInfo methodInfo;  //jni函数信息结构体
	/*getStaticMethodInfo获取到MethodId和ClassId,ClassID通过穿进去的Activity即类名获取，MethodId通过函数名获取*/
	bool isHave=JniHelper::getStaticMethodInfo(methodInfo,"com/example/cocosdemoandroid/MainActivity","showMessage","()V");
	if(isHave)
	{
		/*调用这个函数*/
		methodInfo.env->CallStaticVoidMethod(methodInfo.classID,methodInfo.methodID);
	}

#endif
}

C++层关键的代码就是这两个了，在使用JniHelper的时候不要忘记加上头文件

#ifdef ANDROID
#include<jni.h>
#include"platform/android/jni/JniHelper.h"
#endif

下面来看Android层代码了。

从上面的C++代码中也能看得出来

工程包名 ： com.example.cocosdemoandroid

Activity：MainActivity

public class MainActivity extends Cocos2dxActivity {

	public static   Context mContext;

	/*****消息类型****/
	private static final int SHOW_MESSAGE = 0;

	private static Handler handler=new Handler()
	{
		@Override
		public void handleMessage(Message msg)
		{
			//接受消息然后去做相应的事情
			if(msg.what==SHOW_MESSAGE)
			{
				Log.d("CocosDemoAndroid", String.valueOf(msg.obj));  //获取到Handler传递的参数数据
				AlertDialog.Builder builder=new Builder(mContext);
				builder.setTitle("C++调用Android");
				builder.setMessage("C++调用Android显示弹出框");
				builder.show();
			}
			super.handleMessage(msg);
		}
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		mContext=MainActivity.this;
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	public  static void showMessage()
	{
		Log.d("showMessage", "showMessage");
		Message msg=new Message();
		msg.what=SHOW_MESSAGE;
		msg.obj="showmessage demos";  //可以传递参数
		handler.sendMessage(msg);
	}

	public native int InitJni();

	static
	{
		System.loadLibrary("CocosDemo");
	}

}

对于Android：

为什么要使用Handle sendMessage() ??

因为如果直接在showMessage中弹出提示框，会崩溃提示 Can't create handle inside thread that has not called Looper.prepare()

再附上的Android.mk文件：

LOCAL_PATH := $(call my-dir)

RAKNET_LIB_PATH := ../../../../RakNet_PC-4.08/Android/obj/local/$(TARGET_ARCH_ABI)/libRakNet.a

$(call import-add-path, $(Cocos2d)) \
$(call import-add-path, $(Cocos2d)\cocos2dx\platform\third_party\android\prebuilt) \

include $(CLEAR_VARS)

LOCAL_MODULE				:=	libRakNet
LOCAL_SRC_FILES			:=$(RAKNET_LIB_PATH)

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := CocosDemo_shared

LOCAL_CFLAGS				:=	-w -DANDROID -DRAPIDXML_NO_EXCEPTIONS

LOCAL_MODULE_FILENAME := libCocosDemo

LOCAL_SRC_FILES := jni.cpp \
					../../Classes/TristanaLayer.cpp  \
					../../Classes/AppDelegate.cpp \
					../../Classes/HelloWorldScene.cpp   \
					../../Classes/CControlTest.cpp   \
					../../Classes/CocosDemoMenu.cpp   \
					../../Classes/CCScrollViewTest.cpp   \
					../../Classes/CocosRakNet.cpp   \
					../../Classes/MissCardSprite.cpp   \
					../../Classes/MoveWithMouse.cpp   \
					../../Classes/TransCards.cpp   \
					../../Classes/AndroidPlatform.cpp   \
					../../../public/network/MissGameNetWork.cpp	\
					../../Classes/CallJni.cpp   

LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../Classes \
$(LOCAL_PATH)/../../../public \
$(LOCAL_PATH)/../../../public/network \
$(RakNet)/Source \
$(Cocos2d)/cocos2dx \
$(Cocos2d)/cocos2dx/include \
$(Cocos2d)/cocos2dx/kazmath/include \
$(Cocos2d)/cocos2dx/platform/android \
$(Cocos2d)/cocos2dx/platform/third_party/android \
$(Cocos2d)/external \
$(Cocos2d)/CocosDenshion/include \
$(Cocos2d)/CocosDenshion/android \
$(Cocos2d)/extensions \
$(Cocos2d)/extensions/GUI/CCControlExtension \

LOCAL_STATIC_LIBRARIES	:= 	libRakNet
LOCAL_WHOLE_STATIC_LIBRARIES := cocos2dx_static cocosdenshion_static cocos_extension_static

include $(BUILD_SHARED_LIBRARY)

$(call import-module,CocosDenshion/android) \
$(call import-module,cocos2dx) \
$(call import-module,extensions)

最后上效果图：