Cocos2dx/AndroidNative連携/コールバック

サンプルコード

Delegateを使ったコールバックのサンプル

-Classes/SampleDelegate.h

#ifndef Helloworld_SampleDelegate_h
#define Helloworld_SampleDelegate_h
class SampleDelegate
{
public:
    virtual void onCustomEvent(const char* str) = 0;
};
#endif

SampleDelegate.cppは不要

-Classes/NativeLauncher.h

#ifndef Helloworld_NativeLauncher_h
#define Helloworld_NativeLauncher_h
extern "C" {
    class NativeLauncher
    {
    public:
        static void launchCallbackNative(); // コールバック呼び出しメソッド
        static void setDelegate(SampleDelegate*);
        static SampleDelegate* getDelegate();
    };
}
#endif

-Classes/NativeLauncher.cpp

#include "NativeLauncher.h"
#include <jni.h>
#include "platform/android/jni/JniHelper.h"
#include "SampleDelegate.h"
#define CLASS_NAME "org/cocos2dx/cpp/AppActivity"
extern "C" {
   SampleDelegate* mDelegate;
   void NativeLauncher::launchCallbackNative()
   {
       cocos2d::JniMethodInfo t;
       if (cocos2d::JniHelper::getStaticMethodInfo(t, CLASS_NAME, "launchCallbackNative", "()V")) {
           t.env->CallStaticVoidMethod(t.classID, t.methodID);
           t.env->DeleteLocalRef(t.classID);
       }
   }
   void NativeLauncher::setDelegate(SampleDelegate* delegate)
   {
       mDelegate = delegate;
   }
   SampleDelegate* NativeLauncher::getDelegate()
   {
       return mDelegate;
   }
}

-Classes/com_example_helloworld_SampleBridge.h

#include <jni.h>
#ifndef _Included_com_example_helloworld_SampleBridge
#define _Included_com_example_helloworld_SampleBridge
extern "C" {
    JNIEXPORT void JNICALL Java_com_example_helloworld_SampleBridge_cocosOnCustomEvent(JNIEnv*, jclass, jstring);
}
#endif // com_example_helloworld_SampleBridge

-Classes/com_example_helloworld_SampleBridge.cpp

#include "cocos2d.h"
#include "com_example_helloworld_SampleBridge.h"
#include "NativeLauncher.h"
USING_NS_CC;
extern "C" {
    JNIEXPORT void JNICALL Java_com_example_helloworld_SampleBridge_cocosOnCustomEvent(JNIEnv* env, jclass clazz, jstring srcj) {
        const char *message = env->GetStringUTFChars(srcj, NULL);
        log("success com_example_helloworld_SampleBridge message=%s", message); // launchCallbackNativeMessage
        NativeLauncher::getDelegate()->onCustomEvent(message);
    }
}

-Classes/HelloWorldScene.h

SampleDelegateをimplementし、onCustomEventメソッドを追加する

class HelloWorld : public cocos2d::Layer, SampleDelegate
{
public:
    static cocos2d::Scene* createScene();
    virtual bool init();
    // a selector callback
    void menuCloseCallback(cocos2d::Ref* pSender);
    void menuLogCallback(cocos2d::Ref* pSender);
    void onCustomEvent(const char*);
    // implement the "static create()" method manually
    CREATE_FUNC(HelloWorld);
};

-Classes/HelloWorldScene.cpp

#include "NativeLauncher.h"
bool HelloWorld::init()
{
// 略
   auto logItem = MenuItemImage::create(
                                          "CloseNormal.png",
                                          "CloseSelected.png",
                                          CC_CALLBACK_1(HelloWorld::menuLogCallback, this));
   logItem->setPosition(Vec2(origin.x + visibleSize.width - logItem->getContentSize().width/2 ,
                                origin.y + visibleSize.height - logItem->getContentSize().height/2));
   auto logmenu = Menu::create(logItem, NULL);
   logmenu->setPosition(Vec2::ZERO);
   this->addChild(logmenu, 1);
// 略
}
void HelloWorld::menuLogCallback(Ref* pSender)
{
    NativeLauncher::launchCallbackNative();
}
void HelloWorld::onCustomEvent(const char* message) {
    log("onCustomEvent delegate '%s'", message);
}

-proj.android-studio/app/src/org/cocos2dx/cpp/AppActivity.java

import com.example.helloworld.SampleBridge;
public class AppActivity extends Cocos2dxActivity {
    public static void launchCallbackNative() {
        System.out.println("launchCallbackNative()");
        (new SampleBridge()).onCustomEvent("launchCallbackNativeMessage");
    }
}

-proj.android/jni/Android.mk

LOCAL_SRC_FILES := hellocpp/main.cpp \
                   ../../Classes/AppDelegate.cpp \
                   ../../Classes/HelloWorldScene.cpp \
                   ../../Classes/NativeLauncher.cpp \
                   ../../Classes/com_example_helloworld_SampleBridge.cpp

NativeLauncher.cppとcom_example_helloworld_SampleBridge.cppを追加

-proj.android-studio/app/jni/Android.mk

LOCAL_SRC_FILES := hellocpp/main.cpp \
                   ../../../Classes/AppDelegate.cpp \
                   ../../../Classes/HelloWorldScene.cpp \
                   ../../../Classes/NativeLauncher.cpp \
                   ../../../Classes/com_example_helloworld_SampleBridge.cpp

NativeLauncher.cppとcom_example_helloworld_SampleBridge.cppを追加

-proj.android-studio/app/src/com/example/helloworld/SampleBridge.java

package com.example.helloworld;
/**
 * androidでは(new SampleBridge).onCustomEvent();で呼び出し可能
 */
public class SampleBridge {
    private static native void cocosOnCustomEvent(String message);
    public void onCustomEvent(final String message) {
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("SampleBridge.onCustomEvent");
                SampleBridge.cocosOnCustomEvent(message);
            }
        });
        thread.start();
    }
}

typeリスト

JNI Types	Java Type
void	void
jboolean	boolean
jbyte	byte
jchar	char
jshort	short
jint	int
jlong	long
jfloat	float
jdouble	double
jobject	All Java objects
jclass	java.lang.Class objects
jstring	java.lang.String objects
jobjectArray	Array of objects
jbooleanArray	Array of booleans
jbyteArray	Array of bytes
jshortArray	Array of shorts
jintArray	Array of integers
jlongArray	Array of longs
jfloatArray	Array of floats
jdoubleArray	Array of doubles

参考：http://stnguyen.com/cocos2d-x/call-cpp-functions-from-java.html

コールバック関数ファイルについて

明示的にcom_example_helloworld_SampleBridge.hに分けて記載してるが、NativeLauncher.hに一緒にしても問題ない。 ただし、iOSなどではこの関数は使わないので分けたほうが良い。

Unable to find source java classエラーが出た場合

一旦android-project側をclean&buildしてみる。

Execution failed for task ':compileDebugJavaWithJavac'エラーが出た場合

一旦android-project側をclean&buildしてみる。