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
#include "platform/android/jni/JniHelper.h"
#include
#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

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