[Android] Custom Array Adapter for ListView with ViewHolder class

CustomArrayAdapter.java

public class CustomArrayAdapter extends ArrayAdapter {

    // declare your custom list with type;
    private List<YourModelClass> allData = new ArrayList<YourModelClass>();

    public CustomArrayAdapter(@NonNull Context context, List<YourModelClass> allData) {
        super(context, R.layout.your_layout, allData); // add your_layout.xml
        this.allData = allData;
    }

    class ViewHolder {
        TextView name, phone; // declare your your_layout.xml view type
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        ViewHolder holder = new ViewHolder();
        if (convertView == null) {
          
            convertView = inflater.inflate(R.layout.your_layout, parent, false); // inflate your_layout.xml

            //initialize your your_layout.xml view
            holder.name = convertView.findViewById(R.id.tv_item_name);
            holder.phone = convertView.findViewById(R.id.tv_item_phone);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        //set value into your_layout.xml
        holder.name.setText(allData.get(position).getName());
        holder.phone.setText(allData.get(position).getNumber());

        return convertView;
    }
}