Unable to use LayoutInflater in custom adapter

Question

I\'m looking into writing a custom adapter to populate a listview with 3 textviews per line. I\'ve found quite a bit of example code to do this, but the one that seemed the

Answer 1

@Axel22's answer is key, but there are a few other things missing from your code. First, you should be extending either BaseAdapter or ArrayAdapter, depending on your preference. Second, you want to get in the practice of using a ViewHolder to avoid making excessive calls to findViewById, and (most importantly) recycling your View.

private Class ViewHolder {
  public TextView cityControl;
  public TextView temperatureControl;
  public ImageView skyControl;
  public ViewHolder(TextView cityControl, TextView temperatureControl, ImageView skyControl) {
    this.cityControl = cityControl;
    this.temperatureControl = temperatureControl;
    this.skyControl = skyControl;
  }

Your getView function can recycle views and utilize the ViewHolder class as follows:

public View getView(int position, View convertView, ViewGroup parent) { 
    Weather weather = weatherList.get(position);
    // This is how you attempt to recycle the convertView, so you aren't 
    // needlessly inflating layouts.
    View v = convertView;
    ViewHolder holder;
    if (null == v) {
        v = LayoutInflater.from(getContext()).inflate(R.layout.weather_row, parent, false);
        TextView cityControl = (TextView)v.findViewById( R.id.city );
        TextView temperatureControl = (TextView)v.findViewById( R.id.temperature );
        ImageView skyControl = (ImageView)v.findViewById( R.id.sky );
        holder = new ViewHolder(cityControl, temperatureControl, skyControl);
        v.setTag(holder);
    } else {
        holder = (ViewHolder) v.getTag();
    }

    holder.cityControl.setText("Metropolis");
    holder.temperatureControl.setText("78");
    holder.skyControl.setImageResource(R.drawable.daily_planet);

    return v;

}

For tons more examples (and other optimization tips), see this blog post (or just google for ViewHolder).