java - 将数组类型更改为 int 后，ListAdapter 拒绝申请

Question

将我的列表项的数组类型更改为“int”后，我的列表适配器拒绝应用它。我该如何解决这个问题？

ListData.java

public class ListData {

    public static final String[][] items = {
            {R.string.america,R.string.america_description},
            {R.string.europe, R.string.europe_description},
    };
}

在 FilterListFragment.java 中:

private void initialize(View view) {
    //Set up list view
    mAdapter = new ItemListAdapter(getData(ListData.items), getActivity());
    ListView lvItems = (ListView) view.findViewById(R.id.lv_items);
    lvItems.setAdapter(mAdapter);
}

(ListData.items) 显示为红色下划线，我收到此错误:

(java.lang.string[]) in FilterListFragment cannot be applied to (int[][])

ItemListadapter.java

public class ItemListAdapter extends BaseAdapter implements Filterable {

    private List<String> mData;
    private List<String> mFilteredData;
    private LayoutInflater mInflater;
    private ItemFilter mFilter;

    public ItemListAdapter (List<String> data, Context context) {
        mData = data;
        mFilteredData = data;
        mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

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

    @Override
    public String getItem(int position) {
        return mFilteredData.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        String strItem = mFilteredData.get(position);
        ViewHolder holder;
        if (convertView == null) {
           convertView = mInflater.inflate(R.layout.item_row, parent, false);

            holder = new ViewHolder();
            holder.mTitle = (TextView) convertView.findViewById(R.id.item_title);
            holder.mDescription = (TextView) convertView.findViewById(R.id.item_description);

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

        holder.mTitle.setText(strItem);
        holder.mDescription.setText(strItem);

        return convertView;
    }

    @Override
    public Filter getFilter() {
        if (mFilter == null) {
            mFilter = new ItemFilter();
        }
        return mFilter;
    }

    /**
     * View holder
     */
    static class ViewHolder {
        private TextView mTitle;
        private TextView mDescription;
    }

    /**
     * Filter for filtering list items
     */
    private class ItemFilter extends Filter {

        /**
         * Invoked on a background thread.  This is where all the filter logic should go
         * @param constraint the constraint to filter on
         * @return the resulting list after applying the constraint
         */
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {

            FilterResults results = new FilterResults();

            if (TextUtils.isEmpty(constraint)) {
                results.count = mData.size();
                results.values = mData;
            } else {
                //Create a new list to filter on
                List<String> resultList = new ArrayList<>();
                for (String str : mData) {
                    if (str.toLowerCase().contains(constraint.toString().toLowerCase())) {
                        resultList.add(str);
                    }
                }
                results.count = resultList.size();
                results.values = resultList;
            }
            return results;
        }

        /**
         * Runs on ui thread
         * @param constraint the constraint used for the result
         * @param results the results to display
         */
        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {

            if (results.count == 0) {
                notifyDataSetInvalidated();
            } else {
                mFilteredData = (ArrayList<String>)results.values;
                notifyDataSetChanged();
            }
        }
    }
}

Answer 1

您的 getData 需要一个 String[] 并且您正在提供一个关于 int 的矩阵。您应该更改其签名，以便接受 int[][] 或更好的 int[]。如果你不想改变你的适配器，让 getData，将资源的 id 转换为 String。例如

 public List<String> getData(int[] res) {
    ArrayList<String> resStrings = new ArrayList<>();
    for (int i : res) {
          resStrings.add(getString(i));
    }
    return resStrings;
 }

或者如果你想使用 int[][]

 public List<String> getData(int[][] res) {
    ArrayList<String> resStrings = new ArrayList<>();        
    for (int[] i : res) {
          for (int j : i) {
              resStrings.add(getString(j));
          }
    }
    return resStrings;
 }