SectionAdapter.java

package com.test.customlistview;

import java.util.LinkedHashMap;
import java.util.Map;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;

public class SectionAdapter extends BaseAdapter {
   protected final static int TYPE_SECTION_HEADER = 0;
   protected final ArrayAdapter<String> headers;
   protected final Map<String, Adapter> sections = new LinkedHashMap<String, Adapter>();
   protected boolean showHeaders = true;

   public SectionAdapter(Context context) {
     headers = new ArrayAdapter<String>(context, R.layout.header_row);
   }

   public void addSection(String header, Adapter adapter) {
     headers.add(header);
     sections.put(header, adapter);
   }

   public void clear () {
     headers.clear();
     sections.clear();
   }

   public boolean areAllItemsSelectable() {
     return false;
   }

   public int getCount() {
     int total = 0;

     for (Adapter adapter : this.sections.values()) {
       int size = adapter.getCount();

       if (size == 0)
         continue;

       total += size + (showHeaders ? 1 : 0);
     }

     return total;
   }

   public Object getItem(int position) {
     for (Object section : this.sections.keySet()) {
       Adapter adapter = sections.get(section);

       int size = adapter.getCount();

       if (size == 0)
         continue;

       size += (showHeaders ? 1 : 0);

       if (showHeaders) {
         if (position == 0)
           return section;
         if (position < size)
           return adapter.getItem(position - 1);
       } else if (position < size) {
         return adapter.getItem(position);
       }

       position -= size;
     }

     return null;
   }

   public long getItemId(int position) {
     return position;
   }

   public int getItemViewType(int position) {
     int type = 1;

     for (Object section : this.sections.keySet()) {
       Adapter adapter = sections.get(section);

       int size = adapter.getCount();

       if (size == 0)
         continue;

       size += (showHeaders ? 1 : 0);

       if (showHeaders) {
         if (position == 0)
           return TYPE_SECTION_HEADER;
         if (position < size)
           return type + adapter.getItemViewType(position - 1);
       } else if (position < size) {
         return type + adapter.getItemViewType(position);
       }

       position -= size;
       type += adapter.getViewTypeCount();
     }

     return -1;
   }

   public View getView(int position, View convertView, ViewGroup parent) {
     int sectionnum = 0;
     for (Object section : this.sections.keySet()) {
       Adapter adapter = sections.get(section);

       int size = adapter.getCount();

       if (size == 0) {
         sectionnum++;
         continue;
       }

       size += (showHeaders ? 1 : 0);

       if (showHeaders) {
         if (position == 0)
           return headers.getView(sectionnum, convertView, parent);
         if (position < size)
           return adapter.getView(position - 1, convertView, parent);
       } else if (position < size) {
         return adapter.getView(position, convertView, parent);
       }

       position -= size;
       sectionnum++;
     }

     return null;
   }

   public int getViewTypeCount() {
     int total = 1;

     for (Adapter adapter : this.sections.values())
       total += adapter.getViewTypeCount();

     return total;
   }

   public boolean isEnabled(int position) {
     return (getItemViewType(position) != TYPE_SECTION_HEADER);
   }

   public void setShowHeaders(boolean showHeaders) {
     this.showHeaders = showHeaders;
   }

}