[Solved] Call a c++ function that returns a int value from java

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I just had to place the cpp file name in the Android.mk file… This is my first time so sorry…
Fixed code:
C++

#include <string.h>
#include <jni.h>

extern "C"
{

    JNIEXPORT jint JNICALL Java_net_pixeldroidof_addonedit_MainActivity_getScreenY(JNIEnv* env, jobject thiz)
    {
        int number = 30;
        return number;
    }
}

Java

public native static int getScreenY();
//And you can start calling it(example: getScreenY() will now return the value from the cpp)

solved Call a c++ function that returns a int value from java