how to set image to image view by image name that stored in database in android?

i have a class that get two field(name and image) in database and set name to Text View and image set to image view now i have problem with image , how to should set image to image view by image name that stored in database ? Please Help me!

my source code:

---

public class ListMovie extends BaseAdapter {

private Resources res = null;
private Activity activity;
private ArrayList<HashMap<String, String>> data;
private LayoutInflater inflate;
ViewHolder holder;

public ListMovie(Activity a, ArrayList<HashMap<String, String>> d) {
    // TODO Auto-generated constructor stub

    activity = a;
    data = d;
    inflate = (LayoutInflater) activity
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
    // TODO Auto-generated method stub
    return data.size();
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public View getView(int arg0, View view, ViewGroup arg2) {
    // TODO Auto-generated method stub

    View v1 = view;

    if (v1 == null) {

        v1 = inflate.inflate(R.layout.item, null);
        holder = new ViewHolder();

        holder.txt_name = (TextView) v1.findViewById(R.id.item_name);

        holder.img = (ImageView) v1.findViewById(R.id.item_img);


        v1.setTag(holder);

    } else {

        holder = (ViewHolder) v1.getTag();

    }
    HashMap<String, String> song = new HashMap<String, String>();
    song = data.get(arg0);


    holder.txt_name.setText(song.get("name"));

    return v1;

}
static class ViewHolder {
    TextView txt_name;
    ImageView img;  
}
}