Question

[拍卖列表图像] [1]我正在尝试实现搜索功能，以通过特定的TextView（即ItemName TextView）在ListView中进行搜索，如“ Adidas Shoes”和“ Nike Shoes”之类的图像中所示。该TextView的ID为txtName。当前，使用这些代码，没有错误，但是搜索功能没有执行任何操作。如何通过查看txtName TextView实现搜索以实际搜索？

适配器：

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<Model>();
            for (int i = 0; i < auctionList.size(); i++) {
                if ((auctionList.get(i).getName().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(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;
}


}

AuctionList.java：

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

    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 false;
        }
    });


    return super.onCreateOptionsMenu(menu);
}

Answer 1

在适配器内创建一个私有类

  /**
 * Custom filter for Brand list
 * Filter content in brand list according to the search text
 */
private class BrandFilter extends Filter {

    @Override
    protected FilterResults performFiltering(CharSequence constraint) {
        FilterResults filterResults = new FilterResults();
        if (constraint!=null && constraint.length()>0) {
            ArrayList<User> tempList = new ArrayList<User>();

            // search content in Brand list
            for (User user : brandList) {
                if (mList.getBrandName().toLowerCase().contains(constraint.toString().toLowerCase())) {
                    tempList.add(user);
                }
            }

            filterResults.count = tempList.size();
            filterResults.values = tempList;
        } else {
            filterResults.count = friendList.size();
            filterResults.values = friendList;
        }

        return filterResults;
    }

    /**
     * Notify about filtered list to ui
     * @param constraint text
     * @param results filtered result
     */
    @SuppressWarnings("unchecked")
    @Override
    protected void publishResults(CharSequence constraint, FilterResults results) {
        filteredList = (ArrayList<User>) results.values;
        notifyDataSetChanged();
    }
}

对您的适配器实施Filterable，然后将以下代码写入Override函数getfilter。

 if (brandFilter == null) {
        Filter = new BrandFilter();
    }

    return friendFilter;

只需在onQueryTextChange的活动中调用此方法

        mAdapetr.getFilter().filter(newText);

Answer 2

对于临时列表：

    private ArrayList<Model> filteredList;

以及您的构造函数

this.filteredList = auctionList

发布结果时，/** * Notify about filtered list to ui * @param constraint text * @param results filtered result */ @SuppressWarnings("unchecked") @Override protected void publishResults(CharSequence constraint, FilterResults results) { filteredList = (ArrayList<Model>) results.values; notifyDataSetChanged(); }

实现搜索功能以通过特定的TextView在ListView中进行搜索

2 个答案: