ScrollParallaxImageView iv = (ScrollParallaxImageView) findViewById(R.id.img);
iv.setParallaxStyles(new VerticalMovingStyle()); // or other parallax styles

public class MyParallaxStyle implements ScrollParallaxImageView.ParallaxStyle {
  @Override
    public void transform(ScrollParallaxImageView view, Canvas canvas, int x, int y) {
        // Transform the view here, x and y stands for the coordinate of
        // ScrollParallaxImageView's top-left corner.
    }

    @Override
    public void onAttachedToImageView(ScrollParallaxImageView view) {
        // Do something when the style is set to a ScrollParallaxImageView.
    }

    @Override
    public void onDetachedFromImageView(ScrollParallaxImageView view) {
        // Do something when the style is remove from a ScrollParallaxImageView.
    }
}