parallaxpager/src/main/java/com/prolificinteractive/parallaxpager/ParallaxContainer.java
@Deprecated
  protected void attachOnPageChangeListener(ViewPager viewPager,
      ViewPager.OnPageChangeListener listener) {
    viewPager.setOnPageChangeListener(listener);
  }
@Deprecated
  protected void attachOnPageChangeListener(ViewPager viewPager,
      ViewPager.OnPageChangeListener listener) {
    viewPager.setOnPageChangeListener(listener);
  }
Sets the {@link ViewPager.OnPageChangeListener} to the embedded {@link ViewPager}
created by the container.

This method can be overridden to add an page indicator to the parallax view. If
this method is overriden, make sure that the listener methods are called on this
class as well.