在 Array Adapter 中实现 Filterable 不会过滤任何结果 - 与过滤前相同的列表

Posted 2023-04-19

【中文标题】在 Array Adapter 中实现 Filterable 不会过滤任何结果 - 与过滤前相同的列表

【英文标题】：Implementing Filterable in Array Adapter is not filtering any results - same list as before filtering

【发布时间】：2018-10-13 21:33:49

【问题描述】：

这是我第一次在我的代码中实现 Filterable。我遵循了所有步骤，但过滤仍然没有过滤任何结果。

在我的阵列适配器中实现了可过滤 根据数组适配器中的名称制作我的过滤器 覆盖 getFilter 以使用我的新过滤器阵列适配器 将编辑文本链接到数组适配器并请求过滤

我仍然看到与过滤前相同的列表。我错过了什么？请在下面查看我的代码。提前致谢！

public class OnlineShopsAdapter extends ArrayAdapter<OnlineShop> implements Filterable 
    private Context context;
    private List<OnlineShop> mOnlineShops;
    Filter mOnlineShopsFilter;

    public OnlineShopsAdapter (Context context, int resource, List<OnlineShop> objects)
        super(context, resource, objects);
        this.context = context;
        this.mOnlineShops = objects;
    



    @Override
    public View getView (int position, View convertView, ViewGroup parent) 
        final OnlineShop onlineShop = getItem(position);

        if (convertView == null) 
            convertView = ((Activity) getContext()).getLayoutInflater().inflate(R.layout.one_online_shop_display, parent, false);
        

        mOnlineShopsFilter = new Filter() 
            @Override
            protected FilterResults performFiltering(CharSequence constraint) 
                Toast.makeText(getContext(),constraint,Toast.LENGTH_SHORT).show();
                FilterResults filterResults = new FilterResults();
                ArrayList<OnlineShop> tempList=new ArrayList<OnlineShop>();
                //constraint is the result from text you want to filter against.
                //objects is your data set you will filter from
                if(constraint != null && mOnlineShops!=null) 
                    int length=mOnlineShops.size();
                    int i=0;
                    while(i<length)
                        OnlineShop item=mOnlineShops.get(i);
                        //do whatever you wanna do here
                        //adding result set output array
                        if(item.getShopName().toUpperCase().contains(constraint.toString().toUpperCase() )) 
                            Toast.makeText(getContext(),"Im in",Toast.LENGTH_SHORT).show();
                            tempList.add(item);
                        
                        i++;
                    
                    //following two lines is very important
                    //as publish result can only take FilterResults objects
                    filterResults.values = tempList;
                    filterResults.count = tempList.size();
                
                return filterResults;
            

            @SuppressWarnings("unchecked")
            @Override
            protected void publishResults(CharSequence contraint, FilterResults results) 
                mOnlineShops = (ArrayList<OnlineShop>) results.values;
                if (results.count > 0) 
                    notifyDataSetChanged();
                 else 
                    notifyDataSetInvalidated();
                
            
        ;

        return convertView;
    

    @Override
    public Filter getFilter() 
        return  mOnlineShopsFilter;
    

这是我的编辑文本所在的位置：

private GridView mOnlineShopsListView;
private ArrayList searchResultsKeysForShops;

@Nullable
@Override
public View onCreateView (LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
    View v = inflater.inflate(R.layout.get_points,container,false);
    mOnlineShopsListView = (GridView) v.findViewById(R.id.online_shops_grid_view);

    //making the adapter work so it can show the Online Shops from the database

    mOnlineShopsListView.setAdapter(MainActivity.mOnlineShopsAdapter);

    editSearch.addTextChangedListener(new TextWatcher() 
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) 

        

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) 
            mOnlineShopsAdapter.getFilter().filter(s);
        

        @Override
        public void afterTextChanged(Editable s) 

        
    );

    return v;

和我的班级：

public class OnlineShop 
    private String shopName;
    private int preferenceScore;



    public OnlineShop ()
    

    public String setShopName(String shopName) 
        this.shopName = shopName;
        keywords.add(shopName);
        return shopName;
    
    public int setPreferenceScore(int preferenceScore) 
        this.preferenceScore = preferenceScore;
        return preferenceScore;
    

    public String getShopName()  return shopName; 

    public int getPreferenceScore()  return preferenceScore; 

    public static Comparator<OnlineShop> OnlineShopPreferenceScoreComparator
            = new Comparator<OnlineShop>() 

        public int compare(OnlineShop onlineShop1, OnlineShop onlineShop2) 

            int onlineShop1PreferenceScore1 = onlineShop1.getPreferenceScore();
            int onlineShop1PreferenceScore2 = onlineShop2.getPreferenceScore();

            //ascending order
            //fruitName1.compareTo(fruitName2);
            //descending order
            //return fruitName2.compareTo(fruitName1);

            return onlineShop1PreferenceScore1 - onlineShop1PreferenceScore2;
        

    ;

【参考方案1】：

我还必须重写以下方法：

public int getCount() 
    return mOnlineShops.size();


public OnlineShop getItem(int position) 
    return mOnlineShops.get(position);


public long getItemId(int position) 
    return position;