安卓 : Filterable not working on text clear

Question

我有自定义 ListView ，我已经实现了 SearchView 来过滤数据。当我们为搜索 ListView 键入内容时，正确地获取过滤器，但是当我从搜索文本中清除某些字符时， ListView 不会过滤数据。它在最后的搜索位置保持不变。

让我用截图来解释。

这里，List 还没有被过滤。所有项目都存在。我正在搜索每个项目的两个字段(名称和描述)。

在这个屏幕上，我从 cam 搜索它显示了正确的结果。

我在 c 之前有明文，我希望结果应该是两个项目，即相机和 LED 电视。

这是我的代码。

RateListAdapter.java

public class RateListAdapter extends BaseAdapter implements Filterable {

Context context;
private SparseBooleanArray mSelectedItemsIds;
public ArrayList<RateList> itemRateList;
public LayoutInflater inflater = null;
public ArrayList<RateList> tempList;
CustomFilter filter;

public RateListAdapter(Context context, ArrayList<RateList> itemRateList) {
    this.context = context;
    this.itemRateList = itemRateList;
    mSelectedItemsIds = new SparseBooleanArray();
    this.tempList = itemRateList;
}

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

@Override
public RateList getItem(int i) {
    return itemRateList.get(i);
}

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

class Holder {
    TextView tv_name, tv_description, tv_amount;
    ImageView iv_itemImage;
}

@Override
public View getView(int i, View convertView, ViewGroup viewGroup) {

    Holder h = new Holder();
    RateList rateList = itemRateList.get(i);
    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    if (convertView == null) {
        convertView = inflater.inflate(R.layout.rate_list_item, viewGroup, false);
    }

    h.tv_name = (TextView) convertView.findViewById(R.id.tv_name);
    h.tv_description = (TextView) convertView.findViewById(R.id.tv_description);
    h.tv_amount = (TextView) convertView.findViewById(R.id.tv_amount);
    h.iv_itemImage = (ImageView) convertView.findViewById(R.id.iv_itemImage);

    h.tv_name.setText(rateList.Name);
    h.tv_description.setText(rateList.description);
    h.tv_amount.setText("₹ "+rateList.amount);
    Picasso.with(context).load(rateList.image).resize(92,92).into(h.iv_itemImage);

    return convertView;
}

public void toggleSelection(int position) {
    selectView(position, !mSelectedItemsIds.get(position));
}

public void selectView(int position, boolean value) {
    if (value)
        mSelectedItemsIds.put(position, value);
    else
        mSelectedItemsIds.delete(position);
    notifyDataSetChanged();
}

public SparseBooleanArray getSelectedIds() {
    return mSelectedItemsIds;
}

public void removeSelection() {
    mSelectedItemsIds = new SparseBooleanArray();
    notifyDataSetChanged();
}

@Override
public Filter getFilter() {
    if(filter == null)
    {
        filter=new CustomFilter();
    }
    return filter;
}

private class CustomFilter extends Filter {
    @Override
    protected FilterResults performFiltering(CharSequence constraint) {

        FilterResults results=new FilterResults();

        if(constraint != null && constraint.length()>0) {

            constraint=constraint.toString().toLowerCase();

            ArrayList<RateList> filters=new ArrayList<RateList>();

            for(int i=0;i<itemRateList.size();i++) {

                if (itemRateList.get(i).Name.toLowerCase().contains(constraint) ||
                        itemRateList.get(i).description.toLowerCase().contains(constraint)) {

                    RateList r = new RateList();
                    r.Name = itemRateList.get(i).Name;
                    r.description= itemRateList.get(i).description;
                    r.id = itemRateList.get(i).id;
                    r.image = itemRateList.get(i).image;
                    r.amount = itemRateList.get(i).amount;

                    filters.add(r);
                }
            }
            results.count = filters.size();
            results.values = filters;
        } else {
            results.count=itemRateList.size();
            results.values=itemRateList;
        }
        return results;
    }

    @Override
    protected void publishResults(CharSequence charSequence, FilterResults results) {
        itemRateList=(ArrayList<RateList>) results.values;
        notifyDataSetChanged();
    }
}
}

搜索查看代码

BookingFrament.java

searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

        @Override
        public boolean onQueryTextSubmit(String query) {
            return true;
        }

        @Override
        public boolean onQueryTextChange(String searchQuery) {
            rateListAdapter.getFilter().filter(searchQuery);
            return false;
        }
    });

请帮忙。

Answer 1

这是因为您正在修改 itemRateList

检查这个方法:

@Override
protected void publishResults(CharSequence charSequence, FilterResults results) {
    itemRateList=(ArrayList<RateList>) results.values;
    notifyDataSetChanged();
}

我会建议将结果存储在一个单独的 arrayList 中，并在您的适配器类中使用它。

由于在原来的itemRateList中更新了上面的结果，所以下次调用performFiltering方法时。您只是在迭代之前的结果，而不是原始列表。

希望这对您有所帮助。