FooterVisibility.java

package org.robobinding.widget.listview;

import org.robobinding.widget.view.AbstractVisibility;

import android.view.View;
import android.widget.ListView;

/**
 * 
 * @since 1.0
 * @version $Revision: 1.0 $
 * @author Cheng Wei
 */
public class FooterVisibility extends AbstractVisibility {
	private ListView listView;
	private View footerView;

	public FooterVisibility(ListView listView, View footerView) {
		this.listView = listView;
		this.footerView = footerView;
	}

	@Override
	public void makeGone() {
		if (listView.getAdapter() == null) {
			return;
		}

		if (listView.getFooterViewsCount() > 0) {
			listView.removeFooterView(footerView);
		}
	}

	@Override
	public void makeVisible() {
		addFooterViewIfNotExist();
		footerView.setVisibility(View.VISIBLE);
	}

	@Override
	protected void makeInvisible() {
		addFooterViewIfNotExist();
		footerView.setVisibility(View.INVISIBLE);
	}

	private void addFooterViewIfNotExist() {
		if (listView.getFooterViewsCount() == 0) {
			listView.addFooterView(footerView);
		}
	}
}