CustomAdapter

public class TuningAdapter extends ArrayAdapter<Tuning> {

    private ArrayList<Tuning> tunings;
    private Context context;
    private int itemLayout;

    public TuningAdapter(Context context, int itemLayout, ArrayList<Tuning> tunings) {
        super(context, itemLayout, tunings);
        this.context = context;
        this.itemLayout = itemLayout;
        this.tunings = tunings;
    }

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

        View row = convertView;
        TuningsHolder holder;

        if (row == null) {
            LayoutInflater inflater = ((Activity) context).getLayoutInflater();
            row = inflater.inflate(itemLayout, parent, false);
            holder = new TuningsHolder(row);
            row.setTag(holder);
        } else {
            holder = (TuningsHolder) row.getTag();
        }

        holder.populateFrom(tunings.get(position));
        return (row);
    }

    private class TuningsHolder {

        private TextView tuningName;
        private TextView tuningNotes;

        TuningsHolder(View row) {
            tuningName = (TextView) row.findViewById(R.id.tuning_name);
            tuningNotes = (TextView) row.findViewById(R.id.tuning_notes);
        }

        void populateFrom(Tuning tuning) {
            tuningName.setText(tuning.getName());
            tuningNotes.setText(tuning.getTuning());
        }
    }
}