How to move an object using buttons in xamarin android?

I'm making a game where you have a plane and you need to control it, nothing complicated. I want to have two buttons, up and down so when I press up for example the plane will smoothly go up until I release the button. Currently I have an animation that moves the plane up and down and I trigger the animation when I press the button. This solution is not the best as when I release the button, the plane doesn't stay at the exact position he stopped at.

downBtn.Touch += (s, e) =>
        {
            var handled = false;

            if (e.Event.Action == MotionEventActions.Down)
            {
                //plane.SetY(plane.GetY() - 10);
                int[] imageCoordinates = new int[2];
                plane.StartAnimation(planeMoveDown);
                handled = true;
            }
            else if (e.Event.Action == MotionEventActions.Up)
            {
                int[] imageCoordinates = new int[2];
                plane.GetLocationOnScreen(imageCoordinates);
                int y = imageCoordinates[1];
                plane.SetY(y+145);
                plane.ClearAnimation();
                handled = true;
            }

            e.Handled = handled;
        };