Beginning Android

  setListAdapter(new CheckAdapter (this, list));
  selection = (TextView)findViewById(R.id.selection);
 }
 private RowModel getModel(int position) {
  return(((CheckAdapter)getListAdapter ()).getItem(position));
 }
 public void onListItemClick(ListView parent, View v,
  int position, long id) {
  selection.setText(getModel (position).toString());
 }
 class CheckAdapter extends ArrayAdapter<RowModel> {
  Activity context;
  CheckAdapter(Activity context, ArrayList<RowModel> list) {
   super(context, R.layout.row, list);
   this.context = context;
  }
  public View getView(int position, View convertView,
   ViewGroup parent) {
   View row = convertView;
   ViewWrapper wrapper;
   RatingBar rate;
   if (row==null) {
    LayoutInflater inflater = context.getLayoutInflater();
    row = inflater.inflate(R.layout.row, null);
    wrapper = new ViewWrapper(row);
    row.setTag(wrapper);
    rate = wrapper.getRatingBar();
    RatingBar.OnRatingBarChangeListener l =
     new RatingBar.OnRatingBarChangeListener() {
     public void onRatingChanged(RatingBar ratingBar,
      float rating, boolean fromTouch) {
      Integer myPosition = (Integer)ratingBar.getTag();
      RowModel model = getModel(myPosition);
      model.rating = rating;
      LinearLayout parent = (LinearLayout)ratingBar.getParent();
      TextView label = (TextView)parent.findViewById(R.id.label);
      label.setText(model.toString());
     }
    };
    rate.setOnRatingBarChangeListener(l);
   } else {
    wrapper = (ViewWrapper)row.getTag();
    rate = wrapper.getRatingBar();
   }
   RowModel model = getModel(position);
   wrapper.getLabel().setText (model.toString());
   rate.setTag(new Integer(position));
   rate.setRating(model.rating);
   return(row);
  }
 }
 class RowModel {
  String label;
  float rating = 2.0f;
  RowModel(String label) {
   this.label = label;
  }
  public String toString() {
   if (rating>=3.0) {
    return (label.toUpperCase());
   }
   return(label);
  }
 }
}

Here is what is different between our earlier code and this activity and getView() implementation:

• While we are still using String[] items as the list of nonsense words, but rather than pouring that String array straight into an ArrayAdapter, we turn it into a list of RowModel objects. RowModel is this demo’s poor excuse for a mutable model; it holds the nonsense word plus the current checked state. In a real system, these might be objects populated from a Cursor, and the properties would have more business meaning.

• Utility methods like onListItemClick() had to be updated to reflect the change from a pure