在ListView中搜索特定描述时，SearchView不会刷新

Question

我正在为我的拍卖列表实现搜索功能。我可以过滤我在SearchView中输入的内容，但是当我删除字段时，它不会刷新。为什么会这样？我相信我的代码已经在onQueryTextChange中考虑了这一点。请指教。

auction list.Java:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.searchmenu,menu);

    final MenuItem myActionMenuItem = menu.findItem(R.id.action_search);
    SearchView searchView = (SearchView)myActionMenuItem.getActionView();

    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String text) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {


            if (TextUtils.isEmpty(newText)) {
                mListView.clearTextFilter();
                mAdapter.getFilter().filter("");
            } else {
                mAdapter.getFilter().filter(newText);

            }
            return true;
        }
    });
    return super.onCreateOptionsMenu(menu);
}

auction adapter.Java:

public class AuctionListAdapter extends BaseAdapter implements Filterable {

    ValueFilter valueFilter;


    private Context context;
    private int layout;
    private ArrayList<Model> auctionList;





    public AuctionListAdapter(Context context, int layout, ArrayList<Model> auctionList) {
        this.context = context;
        this.layout = layout;
        this.auctionList = auctionList;

    }

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

    @Override
    public Object getItem(int position) {
        return auctionList.get(position);
    }


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

    @Override
    public Filter getFilter() {
        if (valueFilter == null) {
            valueFilter = new ValueFilter();
        }
        return valueFilter;
    }

    private class ValueFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();

            if (constraint != null && constraint.length() > 0) {
                ArrayList<Model> filterList = new ArrayList<>();
                for (int i = 0; i < auctionList.size(); i++) {
                    if ((auctionList.get(i).getName().toUpperCase())
                            .contains(constraint.toString().toUpperCase())||(auctionList.get(i).getDescription().toUpperCase())
                            .contains(constraint.toString().toUpperCase())||(auctionList.get(i).getPrice().toUpperCase())
                            .contains(constraint.toString().toUpperCase())||(auctionList.get(i).getDuration().toUpperCase())
                            .contains(constraint.toString().toUpperCase())) {
                        Model model = new Model(auctionList.get(i).getId(),auctionList.get(i).getName(),
                                auctionList.get(i).getDescription(),auctionList.get(i).getPrice(),auctionList.get(i).getDuration()
                                ,auctionList.get(i).getImage());
                        filterList.add(model);
                    }
                }
                results.count = filterList.size();
                results.values = filterList;
            } else {
                results.count = auctionList.size();
                results.values = auctionList;
            }
            return results;


        }


        @Override
        protected void publishResults(CharSequence constraint,
                                      FilterResults results) {
            auctionList = (ArrayList<Model>) results.values;

            notifyDataSetChanged();

        }


    }



private class ViewHolder{
    ImageView imageView;
    TextView txtName,txtDescription,txtPrice,txtDuration;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    View row = convertView;
    ViewHolder holder = new ViewHolder();

    if(row == null){
        LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row = inflater.inflate(layout,null);
        holder.txtName=row.findViewById(R.id.txtName);
        holder.txtDescription=row.findViewById(R.id.txtDescription);
        holder.txtPrice=row.findViewById(R.id.txtPrice);
        holder.txtDuration=row.findViewById(R.id.txtDuration);
        holder.imageView=row.findViewById(R.id.imgIcon);
        row.setTag(holder);
    }
    else{
        holder = (ViewHolder)row.getTag();
    }
    Model model = auctionList.get(position);

    holder.txtName.setText(model.getName());
    holder.txtDescription.setText(model.getDescription());
    holder.txtPrice.setText(model.getPrice());
    holder.txtDuration.setText(model.getDuration());


    byte[] auctionImage = model.getImage();
    Bitmap bitmap = BitmapFactory.decodeByteArray(auctionImage,0,auctionImage.length);
    holder.imageView.setImageBitmap(bitmap);
    return row;



}


}

Answer 1

我在您的代码中进行了一些更改。请查看更改，如果您仍然遇到任何问题，请告诉我们。

auction list.Java:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.searchmenu, menu);

    final MenuItem myActionMenuItem = menu.findItem(R.id.action_search);
    SearchView searchView = (SearchView) myActionMenuItem.getActionView();

    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String text) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            mAdapter.getFilter().filter(newText);
            return true;
        }
    });
    return super.onCreateOptionsMenu(menu);
}

auction adapter.Java:

public class AuctionListAdapter extends BaseAdapter implements Filterable {



private Context context;
private int layout;
private ArrayList<Model> auctionList,filterAuctionAl;


public AuctionListAdapter() {
}

public AuctionListAdapter(Context context, int layout, ArrayList<Model> auctionList) {
    this.context = context;
    this.layout = layout;
    this.auctionList = auctionList;
    filterAuctionAl = auctionList;

}

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

@Override
public Object getItem(int position) {
    return filterAuctionAl.get(position);
}


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

@Override
public Filter getFilter() {
   return new ValueFilter();
}

private class ValueFilter extends Filter {
    @Override
    protected FilterResults performFiltering(CharSequence constraint) {
        FilterResults results = new FilterResults();

        if (constraint != null && constraint.length() > 0) {
            String content= constraint.toString().toUpperCase();
            ArrayList<Model> filterList = new ArrayList<>();
            for (int i = 0; i < filterAuctionAl.size(); i++) {
                if ((filterAuctionAl.get(i).getName().toUpperCase().contains(content))
                        ||(filterAuctionAl.get(i).getDescription().toUpperCase().contains(content))
                        ||(filterAuctionAl.get(i).getPrice().toUpperCase().contains(content))
                        ||(filterAuctionAl.get(i).getDuration().toUpperCase().contains(content))) {
                    Model model = new Model(filterAuctionAl.get(i).getId(),filterAuctionAl.get(i).getName(),
                            filterAuctionAl.get(i).getDescription(),filterAuctionAl.get(i).getPrice(),filterAuctionAl.get(i).getDuration()
                            ,filterAuctionAl.get(i).getImage());
                    filterList.add(model);
                }
            }
            results.count = filterList.size();
            results.values = filterList;
        } else {
            results.count = auctionList.size();
            results.values = auctionList;
        }
        return results;


    }


    @Override
    protected void publishResults(CharSequence constraint,
                                  FilterResults results) {
        filterAuctionAl = (ArrayList<Model>) results.values;

        notifyDataSetChanged();

    }


}



private class ViewHolder{
    ImageView imageView;
    TextView txtName,txtDescription,txtPrice,txtDuration;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    View row = convertView;
    ViewHolder holder = new ViewHolder();

    if(row == null){
        LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row = inflater.inflate(layout,null);
        holder.txtName=row.findViewById(R.id.txtName);
        holder.txtDescription=row.findViewById(R.id.txtDescription);
        holder.txtPrice=row.findViewById(R.id.txtPrice);
        holder.txtDuration=row.findViewById(R.id.txtDuration);
        holder.imageView=row.findViewById(R.id.imgIcon);
        row.setTag(holder);
    }
    else{
        holder = (ViewHolder)row.getTag();
    }
    Model model = filterAuctionAl.get(position);

    holder.txtName.setText(model.getName());
    holder.txtDescription.setText(model.getDescription());
    holder.txtPrice.setText(model.getPrice());
    holder.txtDuration.setText(model.getDuration());


    byte[] auctionImage = model.getImage();
    Bitmap bitmap = BitmapFactory.decodeByteArray(auctionImage,0,auctionImage.length);
    holder.imageView.setImageBitmap(bitmap);
    return row;

}

}

如有任何疑问，请告诉我！

谢谢。