Android Open Source - LayoutPagerAdapter Layout Pager Adapter

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License

The source code is released under:

GNU Lesser General Public License

Java Source Code

/**
 * Layout Pager Adapter//  w w w . ja va2s .c o  m
 *
 * Copyright 2012 Daniel Lupia?ez Casares <lupidan@gmail.com>
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/

package com.daniel.lupianez.casares;

import java.util.ArrayList;
import java.util.List;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;

/**
 * Pager adapter for easy lazy loading of layouts
 * @author Daniel Lupia?ez Casares
 *
 */
public class LayoutPagerAdapter extends PagerAdapter {

  
  
  
  //****************************************************
  // On View Loaded Listener
  /**
   * Interface defining a On View Loaded listener. Called when a view is loaded in the adapter
   * @author Daniel Lupia?ez Casares
   *
   */
  public static interface OnViewLoadedListener{
    /**
     * This method is called when the adapter loads a view to set it into a position of the pager adapter 
     * @param pagerAdapter The pager adapter
     * @param loadedView The loaded view
     * @param position The position of the loaded view in the pager adapter
     */
    void onViewLoadedListener(LayoutPagerAdapter pagerAdapter, View loadedView, int position);
  }
  
  
  
  
  
  //****************************************************
  // Members
  /**
   * The array of layout ids to be shown in the pager adapter
   */
  private List<Integer> layoutIds = new ArrayList<Integer>();
  /**
   * The on view loaded listener
   */
  private OnViewLoadedListener onViewLoadedListener = null;
  
  
  
  
  
  
  
  
  //****************************************************
  // Constructors
  /**
   * Constructor
   */
  public LayoutPagerAdapter() {
    super();
  }
  
  /**
   * Constructor
   * @param layoutIds The layout ids list
   */
  public LayoutPagerAdapter(List<Integer> layoutIds) {
    super();
    this.layoutIds = layoutIds;
  }

  
  
  
  

  //****************************************************
  // Setters/Getters
  /**
   * @param layoutIds the layoutIds to set
   */
  public void setLayoutIds(List<Integer> layoutIds) {
    this.layoutIds = layoutIds;
    //Notify data set changed
    notifyDataSetChanged();
  }
  
  /**
   * @return The current listener for OnViewLoaded
   */
  public OnViewLoadedListener getOnViewLoadedListener() {
    return onViewLoadedListener;
  }

  /**
   * @param onViewLoadedListener The new on view loaded listener
   */
  public void setOnViewLoadedListener(OnViewLoadedListener onViewLoadedListener) {
    this.onViewLoadedListener = onViewLoadedListener;
  }
  
  
  
  
  
  
  
  
  

  //****************************************************
  // Pager Adapter Overrides
  /* (non-Javadoc)
   * @see android.support.v4.view.PagerAdapter#destroyItem(android.view.ViewGroup, int, java.lang.Object)
   */
  @Override
  public void destroyItem(ViewGroup container, int position, Object object) {
    //When destroying the item, remove it from the view group
    View view = (View)object;
    container.removeView(view);
  }

  /* (non-Javadoc)
   * @see android.support.v4.view.PagerAdapter#instantiateItem(android.view.ViewGroup, int)
   */
  @Override
  public Object instantiateItem(ViewGroup container, int position) {
    
    //Get the resource id for that position
    int resourceId = layoutIds.get(position);
    //Inflate the view and add it to the container
    View view = View.inflate(container.getContext(), resourceId, null);
    
    //Tell the listener
    if ((view != null) && (onViewLoadedListener != null))
      onViewLoadedListener.onViewLoadedListener(this, view, position);
    
    //Add the view
    if (view != null)
      container.addView(view);
    
    //Finally, return the object
    return view;
    
  }

  /* (non-Javadoc)
   * @see android.support.v4.view.PagerAdapter#getCount()
   */
  @Override
  public int getCount() {
    //Return the size of the layout Ids
    return layoutIds.size();
  }

  /* (non-Javadoc)
   * @see android.support.v4.view.PagerAdapter#isViewFromObject(android.view.View, java.lang.Object)
   */
  @Override
  public boolean isViewFromObject(View view, Object obj) {
    //Check if view and object are the same
    return (view == obj);
  }

  

}

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