Common mistakes when working with ListView?

When working with ListView in Android applications, developers often encounter common mistakes that can lead to poor performance or incorrect functionality. Here are some of the mistakes to avoid:

Common Mistakes

  • Not using ViewHolder pattern: Failing to implement the ViewHolder pattern can lead to unnecessary calls to findViewById, causing sluggish performance when scrolling.
  • Inadequate data handling: Forgetting to handle data updates effectively can result in stale data being displayed. Use notifyDataSetChanged() properly.
  • Ignoring item click events: Not setting item click listeners may confuse users as they cannot interact with the list items.
  • Overriding getView without performance improvement: Directly inflating views in the getView method without recycling can cause performance issues due to excessive layout operations.
  • Not setting the height of ListView items: If the items do not have a defined height, it can lead to layout issues in the ListView.

Example Code:

<![CDATA[ public class MyListAdapter extends BaseAdapter { private Context context; private List items; public MyListAdapter(Context context, List items) { this.context = context; this.items = items; } @Override public int getCount() { return items.size(); } @Override public String getItem(int position) { return items.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if (convertView == null) { convertView = LayoutInflater.from(context).inflate(R.layout.list_item, parent, false); holder = new ViewHolder(); holder.textView = convertView.findViewById(R.id.text_view); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.textView.setText(getItem(position)); return convertView; } static class ViewHolder { TextView textView; } } ]]>

ListView Android ViewHolder pattern performance optimization item click events data handling

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