test creating objects in c++

testobjects.cpp

//
// Created by Filip Prochazka (@filipproch)
//

#include <jni.h>

#ifdef __cplusplus
extern "C"
{
#endif

JNIEXPORT void JNICALL Java_cz_filipproch_testjniobjects_MainActivity_test( JNIEnv* env,
                                                  jobject thiz ) {
    jclass clazz = env->FindClass("cz/filipproch/testjniobjects/MainActivity");
    jmethodID callbackMethodId = env->GetMethodID(clazz, "testCallback", "(Lcz/filipproch/testjniobjects/Data;)V");

    jclass dataClazz = env->FindClass("cz/filipproch/testjniobjects/Data");
    jmethodID setInt = env->GetMethodID(dataClazz, "setInt", "(I)V");

    jmethodID constructor = env->GetMethodID(dataClazz, "<init>", "()V");
    jobject dataObject = env->NewObject(dataClazz, constructor);

    env->CallVoidMethod(dataObject, setInt, 55);

    env->CallVoidMethod(thiz, callbackMethodId, dataObject);
}


#ifdef __cplusplus
}
#endif