Custom Listview Adapter with filter Android

Question

Please am trying to implement a filter on my listview. But whenever the text change, the list disappears.Please Help Here are my codes. The adapter class.

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Answer 1

please check below code it will help you

DrawerActivity.userListview
            .setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView parent, View view,
                        int position, long id) {

                    int pos = position;
                    Intent intent = new Intent(getContext(),
                            UserDetail.class);
                    intent.putExtra("model", list.get(position));
                    context.startActivity(intent);
                }
            });
    return convertView;
}

@Override
public android.widget.Filter getFilter() {

    return new android.widget.Filter() {

        @Override
        protected void publishResults(CharSequence constraint,
                FilterResults results) {

            ArrayList updatelist = (ArrayList) results.values;
            UserListCustomAdaptor newadaptor = new UserListCustomAdaptor(
                    getContext(), getCount(), updatelist);

            if (results.equals(constraint)) {
                updatelist.add(modelobj);
            }
            if (results.count > 0) {
                notifyDataSetChanged();
            } else {

                notifyDataSetInvalidated();
            }
        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {

            FilterResults filterResults = new FilterResults();
            list = new ArrayList();

            if (constraint != null && DrawerActivity.userlist != null) {

                constraint = constraint.toString().toLowerCase();
                int length = DrawerActivity.userlist.size();
                int i = 0;
                while (i < length) {

                    UserListModel modelobj = DrawerActivity.userlist.get(i);
                    String data = modelobj.getFirstName() + " "
                            + modelobj.getLastName();
                    if (data.toLowerCase().contains(constraint.toString())) {
                        list.add(modelobj);
                    }

                    i++;
                }
                filterResults.values = list;
                filterResults.count = list.size();
            }
            return filterResults;
        }
    };
}

@Override
public int getCount() {
    return list.size();
}

@Override
public UserListModel getItem(int position) {

    return list.get(position);
}