Android Open Source - yammp Separated List Adapter

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Back to project page yammp.

License

The source code is released under:

GNU Lesser General Public License

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Java Source Code

package org.yammp.widget;
/*from ww  w . j a  v a  2 s  .c  om*/
import java.util.LinkedHashMap;
import java.util.Map;

import org.yammp.R;

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 SeparatedListAdapter extends BaseAdapter {

  private final Map<String, Adapter> sections = new LinkedHashMap<String, Adapter>();
  private final ArrayAdapter<String> headers;
  private final static int TYPE_SECTION_HEADER = 0;

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

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

  public boolean areAllItemsSelectable() {
    return false;
  }

  @Override
  public int getCount() {
    // total together all sections, plus one for each section header
    int total = 0;
    for (Adapter adapter : sections.values()) {
      total += adapter.getCount() + 1;
    }
    return total;
  }

  @Override
  public Object getItem(int position) {
    for (Object section : sections.keySet()) {
      Adapter adapter = sections.get(section);
      int size = adapter.getCount() + 1;

      // check if position inside this section
      if (position == 0) return section;
      if (position < size) return adapter.getItem(position - 1);

      // otherwise jump into next section
      position -= size;
    }
    return null;
  }

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

  @Override
  public int getItemViewType(int position) {
    int type = 1;
    for (Object section : sections.keySet()) {
      Adapter adapter = sections.get(section);
      int size = adapter.getCount() + 1;

      // check if position inside this section
      if (position == 0) return TYPE_SECTION_HEADER;
      if (position < size) return type + adapter.getItemViewType(position - 1);

      // otherwise jump into next section
      position -= size;
      type += adapter.getViewTypeCount();
    }
    return -1;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    int sectionnum = 0;
    for (Object section : sections.keySet()) {
      Adapter adapter = sections.get(section);
      int size = adapter.getCount() + 1;

      // check if position inside this section
      if (position == 0) return headers.getView(sectionnum, convertView, parent);
      if (position < size) return adapter.getView(position - 1, convertView, parent);

      // otherwise jump into next section
      position -= size;
      sectionnum++;
    }
    return null;
  }

  @Override
  public int getViewTypeCount() {
    // assume that headers count as one, then total all sections
    int total = 1;
    for (Adapter adapter : sections.values()) {
      total += adapter.getViewTypeCount();
    }
    return total;
  }

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

}

Java Source Code List