Creating Android ListView with section headers

public class SeparatedListAdapter extends BaseAdapter {

    private final HeaderAdapter mHeaders;
    private final Map<String, Adapter> mSections = new LinkedHashMap<String, Adapter>();
    private final static int TYPE_SECTION_HEADER = 0;

    public SeparatedListAdapter(Context context) {
        mHeaders = new HeaderAdapter(context);
    }

    public void addSection(String sectionTitle, int count, Adapter adapter) {
        mHeaders.add(new SectionHeader(sectionTitle, count));
        mSections.put(sectionTitle, adapter);
    }

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

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

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

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

            // Otherwise, jump into next section.
            position -= size;
        }
        return null;
    }

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

            // Check if position inside this section.
            if (position == 0)
                return TYPE_SECTION_HEADER;
            else 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 : mSections.keySet()) {
            Adapter adapter = mSections.get(section);
            int size = adapter.getCount() + 1;

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

            // Otherwise, jump into next section.
            position -= size;
            sectionnum++;
        }
        return null;
    }

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

    public boolean areAllItemsSelectable() {
        return false;
    }

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

    private class SectionHeader {
        private String mTitle;
        private int mCount;

        public SectionHeader(String title, int count) {
            mTitle = title;
            mCount = count;
        }

        public String getTitle() {
            return mTitle;
        }

        public int getCount() {
            return mCount;
        }
    }

    private class HeaderAdapter extends ArrayAdapter<SectionHeader> {
        private final Context mContext;

        public HeaderAdapter(Context context) {
            super(context, 0);
            mContext = context;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view = convertView;

            if (view == null) {
                view = LayoutInflater.from(mContext).inflate(R.layout.list_header, parent, false);
                HeaderViewHolder holder = new HeaderViewHolder();
                holder.title = (TextView) view.findViewById(R.id.title);
                holder.count = (TextView) view.findViewById(R.id.count);
                view.setTag(holder);
            }

            HeaderViewHolder viewHolder = (HeaderViewHolder) view.getTag();
            SectionHeader header = getItem(position);
            if (viewHolder != null && header != null) {
                viewHolder.title.setText(header.getTitle());
                viewHolder.count.setText(String.valueOd(header.getCount());
            }

            return view;
        }
    }

    private static class HeaderViewHolder {
        public TextView title;
        public TextView count;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="15dp"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <TextView
        android:id="@+id/count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="right"
        android:textAppearance="?android:attr/textAppearanceMedium" />

</LinearLayout>