Android - Move background vertically

I used this example to create a background animation for my project.

final LinearLayout backgroundOne = (LinearLayout) findViewById(R.id.background_one);
    final LinearLayout backgroundTwo = (LinearLayout) findViewById(R.id.background_two);
    final ValueAnimator animator = ValueAnimator.ofFloat(0.0f, -1.0f);
    animator.setRepeatCount(ValueAnimator.INFINITE); 
    animator.setInterpolator(new LinearInterpolator()); 
    animator.setDuration(1500L); 
    animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 
            @Override
            public void onAnimationUpdate(ValueAnimator animation) { 
                final float progress = (float) 
                animation.getAnimatedValue(); 
                final float width = backgroundOne.getWidth(); 
                final float translationX = width * progress; 
                backgroundOne.setTranslationX(translationX);
                backgroundTwo.setTranslationX(translationX + width); } });
    animator.start();

However, I was only able to move it horizontally to the right and left. Would anyone have any idea how to move vertically?