ArrayAdapter in Android

Overview

ArrayAdapter is used to create a customized item for Spinner.

Example of Simple ArrayAdapter

public class UserAdapter extends ArrayAdapter<User> {


    public UserAdapter(Context context, ArrayList<User> centerList) {
        super(context, 0, centerList);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        return initView(position, convertView, parent);
    }

    @Override
    public View getDropDownView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        return initView(position, convertView, parent);
    }

    private View initView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(
                    R.layout.style_spinner_mnames, parent, false
            );
        }

        TextView modelName = convertView.findViewById(R.id.modelName);
        

        User currentUser = getItem(position);
        if (currentUser != null) {
            modelName.setText(currentUser.getName());
           
        }
        return convertView;
    }
}

Reference