How to call non-static java method from c++?

Question

How I can call java method(non-static) from native(C++) code? I saw some examples on Internet ut don't understood exactly(it' dont works for me).

I trying something like this code:

java code:

public void displayInterstitial() {

            if(adView!=null)
            {

        if (adView.getVisibility() == AdView.VISIBLE) {
                adView.post(new Runnable() {
                    public void run() {
                        adView.setVisibility(AdView.INVISIBLE);
                    }
                });
            }
        }

    }

C++ code:

// JNI OnLoad
JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved)
{
    g_JavaVM = vm;
    return JNI_VERSION_1_6;
}

JNIEnv* MenuState::getJniEnv() {
    JavaVMAttachArgs attachArgs;
    attachArgs.version = JNI_VERSION_1_6;
    //attachArgs.name = ">>>NativeThread__Any";
//  attachArgs.group = NULL;

    JNIEnv* env;
    if (g_JavaVM->AttachCurrentThread(&env, &attachArgs) != JNI_OK) {
        env = NULL;
    }

    return env;
}


void MenuState::displayInterstitial()
{

   JNIEnv *env = getJniEnv();

    jclass cls = env->FindClass("org/libsdl/app/SDLActivity");

  jmethodID dispin = env->GetMethodID(cls, "displayInterstitial", "()V");

     env->CallVoidMethod(obj, dispin);
}

Sorry for maybe duplicate question. How i can get jobject(obj) for this line env->CallVoidMethod(obj, dispin); ?

Non-maskable Interrupt · Accepted Answer · 2014-07-18 16:09:58Z

1

The easiest way is to create the object in Java, then pass the handle with JNI.

If you want to create the object in C++ code, just get the class as you do, find the constructor < init > function, and use env->NewObject(...)

answered Jul 18, 2014 at 16:09

Non-maskable Interrupt

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