How to use footers and headers with Renderers

FooterAdapteeCollection.java

import com.pedrogomez.renderers.ListAdapteeCollection;

public class FooterAdapteeCollection<T> extends ListAdapteeCollection<T> {

  private boolean showFooter;

  public void showFooter() {
    this.showFooter = true;
  }

  public void hideFooter() {
    this.showFooter = false;
  }

  public boolean hasFooter() {
    return showFooter;
  }

  @Override public int size() {
    int size = super.size();
    return hasFooter() ? size + 1 : size;
  }

  @Override public T get(int i) {
    T item = null;
    if (i < super.size()) {
      item = super.get(i);
    }
    return item;
  }
}