Android Open Source - mobile2-android Grouped Adapter

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License

The source code is released under:
Apache License
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Java Source Code

package com.ecollege.android.adapter;
//from  w  ww. jav a  2s.c o m
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang.NotImplementedException;

import android.app.Activity;
import android.content.Context;
import android.database.DataSetObserver;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListAdapter;
import android.widget.TextView;

import com.ecollege.android.R;


public class GroupedAdapter extends BaseAdapter {

  public static final long STARTING_ITEM_ID = Long.MAX_VALUE - 1000;
  
  protected ListAdapter baseAdapter;
  protected Context context;
  private ParentAdapterObserver baseObserver;
  private List<GroupedDataItem> dataItems;
  private boolean hasFooter;
  private boolean hasHeader;
  
  public GroupedAdapter(Context context, ListAdapter baseAdapter) {
    this(context,baseAdapter,true,false);
  }

  public GroupedAdapter(Context context, ListAdapter baseAdapter, boolean hasHeader, boolean hasFooter) {
    this.hasHeader = hasHeader;
    this.hasFooter = hasFooter;
    
    this.baseAdapter = baseAdapter;
    this.context = context;
    calculateHeadersAndFooters();
    baseObserver = new ParentAdapterObserver(this);
    baseAdapter.registerDataSetObserver(baseObserver);
  }
  
  public void update(ListAdapter baseAdapter) {
    this.baseAdapter.unregisterDataSetObserver(baseObserver);
    this.baseAdapter = baseAdapter;
    this.baseAdapter.registerDataSetObserver(baseObserver);
    this.notifyDataSetChanged();
  }

  @Override
  public void notifyDataSetChanged() {
    super.notifyDataSetChanged();
    calculateHeadersAndFooters();
  }
  
  protected void calculateHeadersAndFooters() {
    long itemId = STARTING_ITEM_ID;
    dataItems = new ArrayList<GroupedAdapter.GroupedDataItem>();
    Object lastGroupId = null;
    Object currentGroupId = null;
    
    for (int i=0;i<baseAdapter.getCount();i++) {
      currentGroupId = groupIdFunction(baseAdapter.getItem(i),i);
      
      if (lastGroupId == null && hasHeader) {
        dataItems.add(new GroupedDataItem(GroupedDataItemType.HEADER,currentGroupId, itemId));
        itemId++;
      } else if (currentGroupId != null && !currentGroupId.equals(lastGroupId)) {
        if (hasFooter) {
          dataItems.add(new GroupedDataItem(GroupedDataItemType.FOOTER,currentGroupId, itemId));
          itemId++;
        }
        if (hasHeader) {
          dataItems.add(new GroupedDataItem(GroupedDataItemType.HEADER,currentGroupId, itemId));
          itemId++;
        }
      }
      dataItems.add(new GroupedDataItem(i));
      lastGroupId = currentGroupId;
    }

    if (hasFooter && currentGroupId != null) {
      dataItems.add(new GroupedDataItem(GroupedDataItemType.FOOTER,currentGroupId, itemId));
      itemId++;
    }
  }
  
  protected Object groupIdFunction(Object item, int position) {
    //override in subclass
    throw new NotImplementedException();
  }

  public int getCount() {
    return dataItems.size();
  }

  public Object getItem(int position) {
    GroupedDataItem item = dataItems.get(position);
    if (item.getItemType() != GroupedDataItemType.REGULAR_ITEM) {
      return item;
    } else {
      return baseAdapter.getItem(item.getOriginalPosition());
    }

  }

  public long getItemId(int position) {
    GroupedDataItem item = dataItems.get(position);
    if (item.getItemType() != GroupedDataItemType.REGULAR_ITEM) {
      return item.getItemId();
    } else {
      return baseAdapter.getItemId(item.getOriginalPosition());
    }
  }

  protected int loadMoreViewType() {
    return (baseAdapter.getViewTypeCount() - 1) + 1;
  }
  
  protected int loadingViewType() {
    return (baseAdapter.getViewTypeCount() - 1) + 2;
  }  
  
  public int getItemViewType(int position) {
    GroupedDataItem item = dataItems.get(position);
    
    if (item.getItemType() == GroupedDataItemType.HEADER) {
      return baseAdapter.getViewTypeCount();
    } else if (item.getItemType() == GroupedDataItemType.FOOTER) {
      return hasHeader ? baseAdapter.getViewTypeCount() + 1 : baseAdapter.getViewTypeCount();
    } else {
      return baseAdapter.getItemViewType(item.getOriginalPosition());
    }
  }
  
  public View getLoadMoreView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView =  ((Activity)context).getLayoutInflater().inflate(R.layout.load_more_item, null);
        }
        return convertView;    
  }
  
  public View getLoadingView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView =  ((Activity)context).getLayoutInflater().inflate(R.layout.loading_item, null);
        }
        return convertView;
  }  
  
  //optionally override in subclass
  public View getHeaderView(int position, View convertView, ViewGroup parent, Object groupId) {
        ViewHolder holder;

        if (convertView == null) {
            convertView = ((Activity)context).getLayoutInflater().inflate(R.layout.list_header_item, null);

            holder = new ViewHolder();
            holder.headerLabelText = (TextView) convertView.findViewById(R.id.header_label_text);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        
        holder.headerLabelText.setText(groupId.toString());
        return convertView;
  }  

  //must override in subclass
  public View getFooterView(int position, View convertView, ViewGroup parent, Object groupId) {
    throw new NotImplementedException();
  }

  public View getView(int position, View convertView, ViewGroup parent) {
    GroupedDataItem item = dataItems.get(position);
    
    if (item.getItemType() == GroupedDataItemType.HEADER) {
      return getHeaderView(position, convertView, parent, item.getGroupId());
    } else if (item.getItemType() == GroupedDataItemType.FOOTER) {
      return getFooterView(position, convertView, parent, item.getGroupId());
    } else {
      return baseAdapter.getView(item.getOriginalPosition(),convertView,parent);
    }
  }

  public int getViewTypeCount() {
    int result = baseAdapter.getViewTypeCount();
    if (hasHeader) result++;
    if (hasFooter) result++;
    return result;
  }  
  
  public void registerDataSetObserver(DataSetObserver observer) {
    super.registerDataSetObserver(observer);
  }

  public void unregisterDataSetObserver(DataSetObserver observer) {
    super.unregisterDataSetObserver(observer);
  }

  public boolean hasStableIds() {
    return baseAdapter.hasStableIds();
  }

  public boolean isEmpty() {
    return baseAdapter.isEmpty();
  }

  public boolean areAllItemsEnabled() {
    return false;
  }

  public boolean isEnabled(int position) {
    GroupedDataItem item = dataItems.get(position);
    if (item.getItemType() != GroupedDataItemType.REGULAR_ITEM) {
      return false;
    } else {
      return baseAdapter.isEnabled(item.getOriginalPosition());
    }
  }
  
    private static class ViewHolder {
        TextView headerLabelText;
    }
    
    public enum GroupedDataItemType {
      HEADER,
      REGULAR_ITEM,
      FOOTER
    }
    
  public class GroupedDataItem {
    private GroupedDataItemType itemType;
    private Object groupId;
    private long itemId = -1;
    
    private int originalPosition = -1;
    
    
    public GroupedDataItem(GroupedDataItemType itemType, Object groupId, long itemId) {
      this.itemType = itemType; //HEADER or FOOTER
      this.groupId = groupId;
      this.itemId = itemId;
    }

    public GroupedDataItem(int originalIndex) {
      this.originalPosition = originalIndex;
      this.itemType = GroupedDataItemType.REGULAR_ITEM;
    }
    
    public GroupedDataItemType getItemType() {
      return itemType;
    }
    
    public Object getGroupId() {
      return groupId;
    }
    
    public int getOriginalPosition() {
      return originalPosition;
    }
    
    public long getItemId() {
      return itemId;
    }
    
  }

}
Java Source Code List
