如何在RecyclerView中迭代查看项？

Question

我有一个带有以下适配器的RecyclerView：

public class DataTransferMeasureListAdapter extends DataTransferBaseListAdapter<DataTransferMeasureListAdapter.ViewHolder> {
    private Context context = null;
    private List<DataTransferListEntry> entries = null;

    public DataTransferMeasureListAdapter(Context context, List<DataTransferListEntry> entries) {
        super(context);

        this.context = context;
        this.entries = entries;
    }

    @Override
    public DataTransferMeasureListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(context).inflate(R.layout.fragment_datatransfer_measure_list_row, parent, false);

        return new DataTransferMeasureListAdapter.ViewHolder(this.context, itemView);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        final DataTransferMeasureListEntry entry = (DataTransferMeasureListEntry) entries.get(position);
        final ViewHolder viewHolder = (ViewHolder) holder;

        String time = Helper.getDateTimePattern(this.context, entry.getDate());
        String value = Helper.getMeasureValue(unit, entry.getValue());

        viewHolder.textViewTime.setText(time);
        viewHolder.textViewValue.setText(value);
    }

    @Override
    public int getItemCount() {
        return entries.size();
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        private Context context = null;
        private TextView textViewValue = null;
        private TextView textViewTime = null;

        public ViewHolder(Context context, View itemView) {
            super(itemView);

            this.context = context;

            this.textViewValue = (TextView) itemView.findViewById(R.id.datatransfer_measure_list_row_textview_value);
            this.textViewTime = (TextView) itemView.findViewById(R.id.datatransfer_measure_list_row_textview_time);
        }
    }
}

在我的 ListView 中：

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    this.adapter = new DataTransferMeasureListAdapter(this.getActivity(), this.dataTransferMeasureListEntries);
    this.listRowParent = (RecyclerView) view.findViewById(R.id.datatransfer_measure_list_row_parent);
    this.listRowParent.setAdapter(this.adapter);
    this.listRowParent.setLayoutManager(new LinearLayoutManager(this.getActivity()));
}

我现在需要一种方法来迭代适配器中的每个Viewholder，以便可以更改某些视图元素的可见性。我需要从适配器外部进行设置。

我该如何做到这一点？

- Mulgard

---

更改您的模型中的数据，然后调用 notifyDataSetChanged() / notifyItemChanged(int position) / notifyItemRangeChanged(int positionStart, int itemCount)。 - pskink

Answer 1

如@pskink在评论中所写。 实现这一目标的最快且正确的方法是通过更改entiries数据，使其包含您将通过其设置可见性的值，然后从您的fragment更改这些值，并在一个数据条目发生更改时调用notifyItemChanged，如果有几个数据条目发生更改，则调用notifyItemRangeChanged，如果全部更改或偶发更改则调用notifyDataSetChanged。

您不希望片段调用适配器的方法，而是希望它仅“知道”并操作数据。

- EE66