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

Question

So the title explains everything you need to know... I tried googling for 2 hours but I just cant find a page where it shows you how to do like example I have a code that calculates the screen size in cpp and I want to call it in java to use it(obviously) EDIT: I just have to put the cpp file name or register it in the Android.mk file... My bad still learning CPP android apps

export your c++ function in a dll see http://stackoverflow.com/questions/9485896/calling-c-dll-from-java — user, Feb 26 '17 at 14:57
Possible duplicate of [Calling C++ dll from Java](http://stackoverflow.com/questions/9485896/calling-c-dll-from-java) — user, Feb 26 '17 at 15:00

score 1 · Accepted Answer · answered Feb 26 '17 at 15:46

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)

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

1 Answers1