env->FindClass 函数返回空值

我试图从CPP类中调用Java类中的某些功能。我很成功地打电话三次，直到我第四次致电函数为止。我正在使用Cocos2DX引擎。

我在miscmanagerjni.cpp

我尝试使ClassID和游戏崩溃时会出现以下错误：

12-20 12：06：09.328：w/system.err（26651）：java.lang.noclassdeffounderror：[generic] 12-20 12：06：09.328：w/system.err（26651）：在dalvik.system.nativestart.main（本机方法） 12-20 08：56：35.402：D/libmiscmanager（25952）：无法找到com/games/games/game/miscmanager

的类别

我从Miscmanagerjni.cpp类中成功地称为函数3次。但是当我打电话

jclass ret = penv-> findclass（class_name）;

任何人都可以告诉我是什么导致了这个错误。

这些是我用来获取方法ID和类ID的功能

#define  LOG_TAG    "libMiscManager"
#define  LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)
#define  CLASS_NAME "com/games/Game/MiscManager"
typedef struct JniMethodInfo_
{
    JNIEnv *    env;
    jclass      classID;
    jmethodID   methodID;
}   JniMethodInfo;

extern "C"
{
    // get env and cache it
    static JNIEnv* getJNIEnv(void)
    {
    JavaVM* jvm = cocos2d::JniHelper::getJavaVM();
    if (NULL == jvm) {
        LOGD("Failed to get JNIEnv. JniHelper::getJavaVM() is NULL");
        return NULL;
    }
    JNIEnv *env = NULL;
    // get jni environment
    jint ret = jvm->GetEnv((void**)&env, JNI_VERSION_1_4);
    switch (ret) {
        case JNI_OK :
            // Success!
            return env;
        case JNI_EDETACHED :
            // Thread not attached
            if (jvm->AttachCurrentThread(&env, NULL) < 0)
            {
                LOGD("Failed to get the environment using AttachCurrentThread()");
                return NULL;
            } else {
                // Success : Attached and obtained JNIEnv!
                return env;
            }
        case JNI_EVERSION :
            // Cannot recover from this error
            LOGD("JNI interface version 1.4 not supported");
        default :
            LOGD("Failed to get the environment using GetEnv()");
            return NULL;
    }
}
// get class and make it a global reference, release it at endJni().
static jclass getClassID(JNIEnv *pEnv)
{
    jclass ret = pEnv->FindClass(CLASS_NAME);
    if (! ret)
    {
        LOGD("Failed to find class of %s", CLASS_NAME);
    }
    return ret;
}
static bool getStaticMethodInfo(cocos2d::JniMethodInfo &methodinfo, const char *methodName, const char *paramCode)
{
    jmethodID methodID = 0;
    JNIEnv *pEnv = 0;
    bool bRet = false;
    do 
    {
        pEnv = getJNIEnv();
        if (! pEnv)
        {
            break;
        }
        jclass classID = getClassID(pEnv);
        methodID = pEnv->GetStaticMethodID(classID, methodName, paramCode);
        if (! methodID)
        {
            LOGD("Failed to find static method id of %s", methodName);
            break;
        }
        methodinfo.classID = classID;
        methodinfo.env = pEnv;
        methodinfo.methodID = methodID;
        bRet = true;
    } while (0);
    return bRet;

   }
 void InitJni()
      {
        cocos2d::JniMethodInfo methodInfo;
        if (! getStaticMethodInfo(methodInfo, "Init", "()V"))
        {
            return ;
        }
    methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID);
    methodInfo.env->DeleteLocalRef(methodInfo.classID);
}
void SaveBooleanJni(const char *key, bool value)
    {
         cocos2d::JniMethodInfo methodInfo;
        if (! getStaticMethodInfo(methodInfo, "SaveBoolean", "(Ljava/lang/String;Z)V"))
        {
        return;
    }
    jstring stringArg = methodInfo.env->NewStringUTF(key);
    methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID, stringArg, value);
    methodInfo.env->DeleteLocalRef(stringArg);
    methodInfo.env->DeleteLocalRef(methodInfo.classID);
}
void SaveIntegerJni(const char *key, int value)
{
    cocos2d::JniMethodInfo methodInfo;
    if (! getStaticMethodInfo(methodInfo, "SaveInteger", "(Ljava/lang/String;I)V"))
    {
        return;
    }
    jstring stringArg = methodInfo.env->NewStringUTF(key);
    methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID, stringArg, value);
    methodInfo.env->DeleteLocalRef(stringArg);
    methodInfo.env->DeleteLocalRef(methodInfo.classID);
}
void SaveLongJni(const char *key, long value)
{
    cocos2d::JniMethodInfo methodInfo;
    if (! getStaticMethodInfo(methodInfo, "SaveLong", "(Ljava/lang/String;J)V"))
    {
        return;
    }
    jstring stringArg = methodInfo.env->NewStringUTF(key);
    methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID, stringArg, value);
    methodInfo.env->DeleteLocalRef(stringArg);
    methodInfo.env->DeleteLocalRef(methodInfo.classID);
}
long GetLongJni(const char *key, long defaultValue)
{
     cocos2d::JniMethodInfo methodInfo;
    long ret = 0;
    if (! getStaticMethodInfo(methodInfo, "GetInteger", "(Ljava/lang/String;J)J"))
    {
        return ret;
    }
    jstring stringArg = methodInfo.env->NewStringUTF(key);
    ret = methodInfo.env->CallStaticLongMethod(methodInfo.classID, methodInfo.methodID, stringArg, defaultValue);
    methodInfo.env->DeleteLocalRef(stringArg);
    methodInfo.env->DeleteLocalRef(methodInfo.classID);
    return (long)ret;
}
bool GetBooleanJni(const char *key, bool defaultValue)
{
     cocos2d::JniMethodInfo methodInfo;
    jboolean ret = false;
    if (! getStaticMethodInfo(methodInfo, "GetBoolean", "(Ljava/lang/String;Z)Z"))
    {
        return ret;
    }
     jstring stringArg = methodInfo.env->NewStringUTF(key);
    ret = methodInfo.env->CallStaticIntMethod(methodInfo.classID, methodInfo.methodID, stringArg, defaultValue);
    methodInfo.env->DeleteLocalRef(stringArg);
    methodInfo.env->DeleteLocalRef(methodInfo.classID);
    return ret;
}
int GetIntegerJni(const char *key, int defaultValue)
{
    cocos2d::JniMethodInfo methodInfo;
    int ret = 0;
    if (! getStaticMethodInfo(methodInfo, "GetInteger", "(Ljava/lang/String;I)I"))
    {
        return ret;
    }
    jstring stringArg = methodInfo.env->NewStringUTF(key);
    ret = methodInfo.env->CallStaticIntMethod(methodInfo.classID, methodInfo.methodID, stringArg, defaultValue);
    methodInfo.env->DeleteLocalRef(stringArg);
    methodInfo.env->DeleteLocalRef(methodInfo.classID);
    return (unsigned int)ret;
}
bool IsConnectedToNetworkJni()
{
    cocos2d::JniMethodInfo methodInfo;
    jboolean ret = false;
    if (! getStaticMethodInfo(methodInfo, "IsConnectedToNetwork", "()Z"))
    {
        return ret;
    }
    ret = methodInfo.env->CallStaticBooleanMethod(methodInfo.classID, methodInfo.methodID);
    methodInfo.env->DeleteLocalRef(methodInfo.classID);
    return ret;
}
}