Function JavaMapIntIntToMap

core/android/JNIUtil.cpp:179–256

}

std::map<int, int> JavaMapIntIntToMap(JNIEnv *env, jobject hashMap) {
    std::map<int, int> resultMap;
    if (hashMap == nullptr) {
        return resultMap;
    }
    jclass hashMapClass = env->GetObjectClass(hashMap);
    if (hashMapClass == nullptr) {
        return resultMap;
    }
    jmethodID entrySetMethodID = env->GetMethodID(hashMapClass, "entrySet",
                                                  "()Ljava/util/Set;");
    if (entrySetMethodID == nullptr) {
        env->DeleteLocalRef(hashMapClass);
        return resultMap;
    }
    jobject entrySet = env->CallObjectMethod(hashMap, entrySetMethodID);
    if (env->ExceptionCheck()) {
        env->ExceptionDescribe();
        env->ExceptionClear();
        env->DeleteLocalRef(hashMapClass);
        return resultMap;
    }
    jclass setClass = env->FindClass("java/util/Set");
    jmethodID iteratorMethodID = env->GetMethodID(setClass, "iterator",
                                                  "()Ljava/util/Iterator;");
    jobject iterator = env->CallObjectMethod(entrySet, iteratorMethodID);
    if (env->ExceptionCheck() || iterator == nullptr) {
        env->ExceptionDescribe();
        env->ExceptionClear();
        env->DeleteLocalRef(hashMapClass);
        env->DeleteLocalRef(entrySet);
        env->DeleteLocalRef(setClass);
        return resultMap; // 空map
    }
    jclass iteratorClass = env->FindClass("java/util/Iterator");
    jmethodID hasNextMethodID = env->GetMethodID(iteratorClass, "hasNext", "()Z");
    jmethodID nextMethodID = env->GetMethodID(iteratorClass, "next",
                                              "()Ljava/lang/Object;");

    jclass mapEntryClass = env->FindClass("java/util/Map$Entry");
    jmethodID getKeyMethodID = env->GetMethodID(mapEntryClass, "getKey",
                                                "()Ljava/lang/Object;");
    jmethodID getValueMethodID = env->GetMethodID(mapEntryClass, "getValue",
                                                  "()Ljava/lang/Object;");


    jclass integerClass = env->FindClass("java/lang/Integer");
    jmethodID intValueMethodID = env->GetMethodID(integerClass, "intValue", "()I");

    while (env->CallBooleanMethod(iterator, hasNextMethodID)) {
        jobject entry = env->CallObjectMethod(iterator, nextMethodID);
        if (env->ExceptionCheck() || entry == nullptr) {
            env->ExceptionDescribe();
            env->ExceptionClear();
            break; // 跳出循环
        }
        jobject keyObejct = (env->CallObjectMethod(entry, getKeyMethodID));
        if (!env->IsInstanceOf(keyObejct, integerClass)) {