Cocos2dx/AndroidNative連携/引数＆戻り値ありのソースを表示

==サンプルコード==
-Classes/NativeLauncher.h
 #ifndef Helloworld_NativeLauncher_h
 #define Helloworld_NativeLauncher_h
 extern "C" {
     class NativeLauncher
     {
     public:
         static void launchNative(); // 引数なし＆戻り値なし
         static int tasizanNative(int value, int value2); // 引数数字＆戻り値数字
         static const char* getTerminalIdNative(); // 引数なし＆戻り値文字列
         static const char* concatNative(const char* str, const char* str2); // 引数文字列＆戻り値文字列
     };
 }
 #endif

-Classes/NativeLauncher.cpp
 #include "NativeLauncher.h"
 #include <jni.h>
 #include "platform/android/jni/JniHelper.h"
 #define CLASS_NAME "org/cocos2dx/cpp/AppActivity"
 extern "C" {
     void NativeLauncher::launchNative()
     {
         cocos2d::JniMethodInfo t;
         if (cocos2d::JniHelper::getStaticMethodInfo(t, CLASS_NAME, "launchNative", "()V")) {
             t.env->CallStaticVoidMethod(t.classID, t.methodID);
             t.env->DeleteLocalRef(t.classID);
         }
     }
     int NativeLauncher::tasizanNative(int value, int value2)
     {
         int ret = 0;
         cocos2d::JniMethodInfo t;
         if (cocos2d::JniHelper::getStaticMethodInfo(t, CLASS_NAME, "tasizanNative", "(II)I")) {
             ret = t.env->CallStaticIntMethod(t.classID, t.methodID, value, value2);
             t.env->DeleteLocalRef(t.classID);
         }
         return ret;
     }
     const char* NativeLauncher::getTerminalIdNative()
     {
         cocos2d::JniMethodInfo t;
         if (!cocos2d::JniHelper::getStaticMethodInfo(t, CLASS_NAME, "getTerminalIdNative", "()Ljava/lang/String;")) {
             return "";
         }
         jstring jpath = (jstring)t.env->CallStaticObjectMethod(t.classID, t.methodID);
         const char* ret = t.env->GetStringUTFChars(jpath, NULL);
         t.env->DeleteLocalRef(jpath);
         t.env->DeleteLocalRef(t.classID);
         return ret;
     }
    const char* NativeLauncher::concatNative(const char* str, const char* str2)
    {
        cocos2d::JniMethodInfo t;
        if (!cocos2d::JniHelper::getStaticMethodInfo(t, CLASS_NAME, "concatNative", "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;")) {
            return "";
        }
        jstring jstr = t.env->NewStringUTF(str);
        jstring jstr2 = t.env->NewStringUTF(str2);
        jstring jpath = (jstring)t.env->CallStaticObjectMethod(t.classID, t.methodID, jstr, jstr2);
        const char* ret = t.env->GetStringUTFChars(jpath, NULL);
        t.env->DeleteLocalRef(jpath);
        t.env->DeleteLocalRef(t.classID);
        return ret;
    }
 }

-Classes/HelloWorldScene.h
 class HelloWorld : public cocos2d::Layer
 {
 public:
     static cocos2d::Scene* createScene();
     virtual bool init();
     // a selector callback
     void menuCloseCallback(cocos2d::Ref* pSender);
     void menuLogCallback(cocos2d::Ref* pSender);
     // 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::launchNative();
     int value = NativeLauncher::tasizanNative(10, 5);
     log("tasizan=%i", value); // tasizan=15
     const char* terminal = NativeLauncher::getTerminalIdNative();
     log("terminalId=%s", terminal); // terminalId=aiudo1234
     const char* str = NativeLauncher::concatNative("abc", "def");
     log("concat=%s", str); // concat=abcdefbool
     bool flag = NativeLauncher::isShow(10);
     log("flag=%i", flag);
 }

-proj.android-studio/app/src/org/cocos2dx/cpp/AppActivity.java
 public class AppActivity extends Cocos2dxActivity {
     public static void launchNative()
     {
         System.out.println("launchNative()");
     }
     public static int tasizanNative(int value, int value2)
     {
         System.out.println("tasizan=" + (value + value2));
         return value + value2;
     }
     public static String getTerminalIdNative()
     {
         return "aiueo1234";
     }
     public static String concatNative(String str, String str2)
     {
         System.out.println("concat=" + (str + str2));
         return str + str2;
     }
 }

-proj.android/jni/Android.mk
 LOCAL_SRC_FILES := hellocpp/main.cpp \
                    ../../Classes/AppDelegate.cpp \
                    ../../Classes/HelloWorldScene.cpp \
                    ../../Classes/NativeLauncher.cpp
NativeLauncher.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
NativeLauncher.cppを追加

==E/JniHelper: Failed to find static method id ofエラーが出る場合==
*引数がintの場合は"()V"の部分を"(I)V"に書き換えてあげる
*引数がintで戻りもintの場合は"()V"の部分を"(I)I"に書き換えてあげる
*引数が２つあり両方intの場合は"()V"の部分を"(II)I"に書き換えてあげる
参考：http://qiita.com/isaoeka/items/9cabb349cd18319fd239

*文字列が引数の場合は"()V"の部分に;があるか確認する
 if(JniHelper::getStaticMethodInfo(t, CLASS_NAME, "function_name", "( Ljava/lang/String; Ljava/lang/String;)V")
参考：http://r2274.blog9.fc2.com/blog-entry-1658.html

参考：http://discuss.cocos2d-x.org/t/using-jni-with-more-than-one-parameter/3419

==warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]エラーが出る場合==
char*をconst char*へ変更する