¿Cómo puedo hacer que mi ArrayAdapter siga el patrón ViewHolder?

Aquí está mi ArrayAdapter. Me gustaría hacer esto más eficiente siguiendo el patrón de ViewHolder:

Http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/List14.html

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Pero no estoy seguro de cómo lograr esto.

UPDATE: Patrón de ViewHolder

private class QuoteAdapter extends ArrayAdapter<Quote> { private ArrayList<Quote> items; // used to keep selected position in ListView private int selectedPos = -1; // init value for not-selected public QuoteAdapter(Context context, int textViewResourceId, ArrayList<Quote> items) { super(context, textViewResourceId, items); this.items = items; } public void setSelectedPosition(int pos) { selectedPos = pos; // inform the view of this change notifyDataSetChanged(); } @Override public View getView(int position, View convertView, ViewGroup parent) { View v = convertView; ViewHolder holder; // to reference the child views for later actions if (v == null) { LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); v = vi.inflate(R.layout.mainrow, null); // cache view fields into the holder holder = new ViewHolder(); holder.nameText = (TextView) v.findViewById(R.id.nameText); holder.priceText = (TextView) v.findViewById(R.id.priceText); holder.changeText = (TextView) v.findViewById(R.id.changeText); // associate the holder with the view for later lookup v.setTag(holder); } else { // view already exists, get the holder instance from the view holder = (ViewHolder)v.getTag(); } // change the row color based on selected state if (selectedPos == position) { v.setBackgroundResource(R.drawable.stocks_selected_gradient); holder.nameText.setTextColor(Color.WHITE); holder.priceText.setTextColor(Color.WHITE); holder.changeText.setTextColor(Color.WHITE); } else { v.setBackgroundResource(R.drawable.stocks_gradient); holder.nameText.setTextAppearance(getApplicationContext(), R.style.BlueText); holder.priceText.setTextAppearance(getApplicationContext(), R.style.BlueText); holder.changeText.setTextAppearance(getApplicationContext(), R.style.BlueText); } Quote q = items.get(position); if (q != null) { if (holder.nameText != null) { holder.nameText.setText(q.getSymbol()); } if (holder.priceText != null) { holder.priceText.setText(q.getLastTradePriceOnly()); } if (holder.changeText != null) { try { float floatedChange = Float.valueOf(q.getChange()); if (floatedChange < 0) { if (selectedPos != position) holder.changeText.setTextAppearance(getApplicationContext(), R.style.RedText); // red } else { if (selectedPos != position) holder.changeText.setTextAppearance(getApplicationContext(), R.style.GreenText); // green } } catch (NumberFormatException e) { System.out.println("not a number"); } catch (NullPointerException e) { System.out.println("null number"); } holder.changeText.setText(q.getChange() + " (" + q.getPercentChange() + ")"); } } return v; } } 

 @Override public View getView(int position, View convertView, ViewGroup parent) { View v = convertView; ViewHolder holder; // to reference the child views for later actions if (v == null) { LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); v = vi.inflate(R.layout.mainrow, null); // cache view fields into the holder holder = new ViewHolder(); holder.nameText = (TextView) v.findViewById(R.id.nameText); holder.priceText = (TextView) v.findViewById(R.id.priceText); holder.changeText = (TextView) v.findViewById(R.id.changeText); // associate the holder with the view for later lookup v.setTag(holder); } else { // view already exists, get the holder instance from the view holder = (ViewHolder) v.getTag(); } // no local variables with findViewById here // use holder.nameText where you were // using the local variable nameText before return v; } // somewhere else in your class definition static class ViewHolder { TextView nameText; TextView priceText; TextView changeText; }