Android : Custom ListView Filtering and Bring back old item in the list

Hi I am developing app that has listview. I have used custom Adapter and added filtering option.It's working fine when I put text in the ssearchBox But the problem is when I start to erase the text from searchBox it does not bring back the item..It stays there.

This is my code...Please help.

public class SimpleAdapter extends BaseAdapter implements SectionIndexer{

    private String mSections = "#ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    private ArrayList<String> mCurrentList;
    private Context mContext;
    HolderFilter holderFilter;

    public SimpleAdapter(ArrayList<String> mCurrentList, Context mContext) {
        super();
        this.mCurrentList = mCurrentList;
        this.mContext = mContext;
    }

    @Override
    public int getCount() {
        if (mCurrentList != null)
            return mCurrentList.size();
        else
            return 0;
    }

    @Override
    public String getItem(int position) {
        if (mCurrentList != null)
            return mCurrentList.get(position);
        else
            return null;
    }

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

    public void onItemSelected(int position) {

    }

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

        final int p = position;

        LayoutInflater inflater = (LayoutInflater) mContext
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.img_row_layout, null);

        try {
            TextView textRow = (TextView) convertView.findViewById(R.id.name);
            textRow.setText(getItem(position));
        } catch (Exception e) {
        }

        return convertView;
    }

    @Override
    public int getPositionForSection(int section) {
        for (int j = 0; j < getCount(); j++) {
            if (section == 0) {
                // For numeric section
                for (int k = 0; k <= 9; k++) {
                    String text = null;
                    try {
                        text = mCurrentList.get(j);
                    } catch (Exception e) {
                    }
                    if (text == null)
                        return 0;
                    else if (String.valueOf(text.charAt(0)).toLowerCase().equals(String.valueOf(String.valueOf(k)).toString().toLowerCase()))
                        return j;
                }
            } else {
                String artist = null;
                try {
                    artist = mCurrentList.get(j);
                } catch (Exception e) {
                }
                if (artist == null)
                    return 0;
                else if (String.valueOf(artist.charAt(0)).toLowerCase().equals(String.valueOf(mSections.charAt(section)).toString().toLowerCase())) {
                    return j;
                }
            }
        }
        return 0;
    }

    @Override
    public int getSectionForPosition(int position) {
        return 0;
    }

    @Override
    public Object[] getSections() {
        String[] sections = new String[mSections.length()];
        for (int i = 0; i < mSections.length(); i++)
            sections[i] = String.valueOf(mSections.charAt(i));
        return sections;
    }
    public Filter getFilter() {
        if (holderFilter == null){
            holderFilter = new HolderFilter();
        }
        return holderFilter;
    }
    @SuppressLint("DefaultLocale")
    private class HolderFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();
            if (constraint == null || constraint.length() == 0) {
                results.values = mCurrentList;
                results.count = mCurrentList.size();
            }else {
                List<String> nHolderList = new ArrayList<String>();
                for (String h : mCurrentList) {
                    if (h.toString().toUpperCase().startsWith(constraint.toString().toUpperCase()))
                        nHolderList.add(h);
                }
                results.values = nHolderList;
                results.count = nHolderList.size();
            }
            return results;
        }
        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint,FilterResults results) {
            if (results.count == 0)
                notifyDataSetInvalidated();
            else {
                mCurrentList = (ArrayList<String>) results.values;
                notifyDataSetChanged();
            }
        }
    }
}