JNI

 

  1.cpp掉java非static方法 无参数 无返回值  

 (1).头文件引入

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
#include <jni.h>
#include "platform/android/jni/JniHelper.h"
#include <android/log.h>
#endif

 

(2).按钮事件代码

调用非静态方法的关键代码 

CallStaticVoidMethod

getMethodInfo 

void HelloWorld::menuCloseCallback(CCObject* pSender) {
    JniMethodInfo minfo;
    bool isHave = JniHelper::getMethodInfo(minfo,
            "org/test/ActivityTest", "playVedio", "()V");
    if (isHave) {
        minfo.env->CallStaticVoidMethod(minfo.classID, minfo.methodID);
    }
}

 

(3).java非static方法

void playVedio()
    {

        System.out.println(" playVedio  playVedio  playVedio  ");

    }

 

2. cpp调用java static方法

cpp 

getStaticMethodInfo

CallStaticVoidMethod

CallStaticIntMethod

 

 

CallStaticObjectMethod

 

string(string) 

void HelloWorld::menuCloseCallback(CCObject* pSender) {
    bool isHave;
    const char* msgRet;
    JniMethodInfo minfo;
    const char* fileName = "testWei";

    isHave = JniHelper::getStaticMethodInfo(minfo, "org/test/MoneyStatic",
            "sendWeibo", "(Ljava/lang/String;)Ljava/lang/String;"); //string参数返回string
    if (isHave) {
        jstring jTitle = minfo.env->NewStringUTF(fileName);
        jobject obj = minfo.env->CallStaticObjectMethod(minfo.classID,
                minfo.methodID, jTitle);
        jstring jRet = (jstring) obj;
        msgRet = (minfo.env)->GetStringUTFChars(jRet, NULL);
    }
}

 

int(int)

bool isHave = JniHelper::getStaticMethodInfo(minfo, "org/test/MoneyStatic",  "buyNumber", "(I)I");

jint  _int = minfo.env->CallStaticIntMethod(minfo.classID, minfo.methodID,  333);

void(void)

bool isHave = JniHelper::getStaticMethodInfo(minfo, "org/test/MoneyStatic",  "judgeUsers", "()V");

minfo.env->CallStaticVoidMethod(minfo.classID, minfo.methodID); 

java

//string(string)
public static String sendWeibo(String pCon) {

        System.out.println("sendWeibo  :  " + pCon);
        Message msg = mHandler.obtainMessage();
        msg.what = Demo.SHOW_DIALOG;
        msg.sendToTarget();

        return "";

    } //int(int)
public static int buyNumber(int _int) { System.out.println("buyNumber  :  " + _int);
  return _int+1000;
}

 

3.java调用cpp

原理：通过native调用cpp的可以返回参数

java

 public static native void cardJudge(int pJudge); //其他方法调用此方法 类名.方法名

 public static native void displayProgress(String numString); //

cpp 

 

//pJudge上面传过来的参数

//org_test包名、MoneyStatic类名、cardJudge方法名

 

返回参数int

extern "C" {

void Java_org_test_MoneyStatic_cardJudge(JNIEnv *env, jobject thiz,  jint pJudge){

if (pJudge == 1) {

} else { }

}

}

返回参数string 

extern "C" {

void Java_org_mm_MyStatic_displayProgress(JNIEnv *env, jobject thiz, jstring text) {

const char* pszText = env->GetStringUTFChars(text, NULL);

}

}

 

 4.转换

http://blog.csdn.net/lizhiguo0532/article/details/7219357

 (1) jstring-->const char*  

const char* pszText = env->GetStringUTFChars(text, NULL);

(2)const char*--> jstring  

 

jstring str = env->newStringUTF("HelloJNI");

 

(3)jint --- int