MouseLook on Android issues

I’m trying to get the standard FPS Camera. But I need to click the button to get X and Y mouse values.

It only gets the values when I have mouse button down

if (event.type == SDL_MOUSEMOTION)
    {
        if (SDL_MOUSEBUTTONUP)
        {
            iMouseX = event.motion.x;
            iMouseY = event.motion.y;
        }

    }

I had FPS camera running on PC, but It doesn’t seem to work on Android.