java - 创建 ListView 后查看持有者警告

Question

创建 ListView 并为每个项目的文本分配不同的颜色后，inflater.inflate(R.layout.list_item, parent, false) View rowView = inflater.inflate(R.layout.list_item, parent, false);内以黄色突出显示，并且我收到与我的 View 持有者相关的警告。为了消除此警告，应该将受影响的代码更改为什么？

Unconditional layout inflation from view adapter: Should use View Holder pattern for smoother scrolling

public class FragmentColourChooserList extends android.support.v4.app.Fragment {

    public FragmentColourChooserList() {
        // Required empty constructor
    }

    ListView list_colourchooser;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        View v = inflater.inflate(R.layout.fragment_colour_chooser_list, container, false);

        String[] listContent = {
                getActivity().getResources().getString(R.string.item_0),
                getActivity().getResources().getString(R.string.item_1),
                getActivity().getResources().getString(R.string.item_2),
                getActivity().getResources().getString(R.string.item_3),
                getActivity().getResources().getString(R.string.item_4),
                getActivity().getResources().getString(R.string.item_5),
                getActivity().getResources().getString(R.string.item_6),
                getActivity().getResources().getString(R.string.item_7),
                getActivity().getResources().getString(R.string.item_8),
                getActivity().getResources().getString(R.string.item_9)
        };

        list_colourchooser = (ListView)v.findViewById(R.id.list_colourchooser);
        MyColoringAdapter adapter = new MyColoringAdapter(getActivity(),listContent);
        list_colourchooser.setAdapter(adapter);

        return v;
    }

    private class MyColoringAdapter extends ArrayAdapter<String> {
        private final Context context;
        private final String[] values;

        public MyColoringAdapter(Context context, String[] values) {
            super(context, R.layout.list_item, values);
            this.context = context;
            this.values = values;
        }

        class Holder
        {
            TextView txtView;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View rowView = inflater.inflate(R.layout.list_item, parent, false);
            Holder holder = new Holder();
            holder.txtView = (TextView) rowView.findViewById(R.id.list_item);
            txtView.setText(values[position]);
            int textColorId = R.color.white; // Default color
            switch (position) {
                case 0:
                    textColorId = R.color.brown; break;
                case 1:
                    textColorId = R.color.red; break;
                case 2:
                    textColorId = R.color.yellow; break;
                case 3:
                    textColorId = R.color.green; break;
                case 4:
                    textColorId = R.color.pink; break;
                case 5:
                    textColorId = R.color.grey; break;
                case 6:
                    textColorId = R.color.purple; break;
                case 7:
                    textColorId = R.color.white; break;
                case 8:
                    textColorId = R.color.darkblue; break;
                case 9:
                    textColorId = R.color.lightblue; break;
            }
            txtView.setTextColor(getResources().getColor(textColorId));
            return rowView;
        }
    }
}

Answer 1

尝试使用 viewHolder 类，而不是直接从 rowView 获取值到单独的类型中。

创建持有者类

class Holder
{
    private TextView txtView;
    public TextView getTxtView()
    {
        return txtView;
    }
}

尝试更换

TextView textView = (TextView) rowView.findViewById(R.id.list_item);

与 持有者holderObject = new Holder(); holderObject.getTxtView() = (TextView) rowView.findViewById(R.id.list_item);