当搜索功能启动并更新适配器时，自定义 ListView 会删除列表项中除匹配搜索值之外的所有内容

Question

Image 1 : before any search performed

Image 2 : after search performed

  public class classBidAdapter extends ArrayAdapter<classBidAttributes>  
  implements Filterable {

   ArrayList<classBidAttributes> data;
   Context context;
   CustemFilrer filter;

 //------this is a snippit of my listview custom adapter related to the search/filter function----------------------------------------------------------

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

    class CustemFilrer extends Filter {

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();
            if(constraint != null && constraint.length()>0){
                constraint = constraint.toString();

                ArrayList<classBidAttributes> filter = new ArrayList<classBidAttributes>();
                for(int i =0; i<data.size();i++){
                    if(data.get(i).getTitle().contains(constraint)){

                        classBidAttributes filts = new classBidAttributes(data.get(i).getTitle());

                        filter.add(filts);

                        Toast.makeText(Context, "111"+filts, Toast.LENGTH_SHORT).show();
                    }
                }

                results.count = filter.size();
                results.values=filter;
                Toast.makeText(Context, "222"+filter.size() +" / "+filter, Toast.LENGTH_SHORT).show();

            }else{
                results.count = data.size();
                results.values=data;
                Toast.makeText(Context, ""+data.size() +" / "+data, Toast.LENGTH_SHORT).show();

            }
            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {

            data.clear();
            data.addAll((ArrayList<classBidAttributes>) results.values);
            notifyDataSetChanged();
        }
    }

我猜问题出在“data.clear()，notifyDataSetChanged()”，但我不确定这里出了什么问题。

我添加了图片来解释执行搜索时发生的情况。

希望这就是这个问题所需的一切，如果你需要检查任何东西问我。

Answer 1

你猜对了。你在 data.clear() 中犯了错误。通过这样做，您将清除适配器的完整数据并添加最后的搜索结果。所以下次得不到原始数据再开始过滤。

您应该将原始数据保存在另一个列表中，以便稍后使用您的适配器数据更新它。

你的代码应该是这样的：

public class classBidAdapter extends ArrayAdapter<classBidAttributes>  
  implements Filterable {

    ArrayList<classBidAttributes> data;
    ArrayList<classBidAttributes> original= new ArrayList<>();
    Context context;
    CustemFilrer filter;

    public classBidAdapter(Context context, ArrayList<classBidAttributes> data){
        this.context = context;
        this.data = data;
        original.addAll(data);
    }
}

 //------this is a snippit of my listview custom adapter related to the search/filter function----------------------------------------------------------

@NonNull
@Override
public Filter getFilter() {
    if(filter == null){
        filter = new CustemFilrer();

    }
    return filter;
}

    class CustemFilrer extends Filter {

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();
            if(constraint != null && constraint.length()>0){
                constraint = constraint.toString();

                ArrayList<classBidAttributes> filter = new ArrayList<classBidAttributes>();
                for(int i =0; i<data.size();i++) {
                    if (data.get(i).getTitle().contains(constraint)) {
                        classBidAttributes filts = new classBidAttributes(data.get(i).getTitle());
                        filter.add(filts);
                        Toast.makeText(Context, "111" + filts, Toast.LENGTH_SHORT).show();
                    }
                }
                results.count = filter.size();
                results.values=filter;
                Toast.makeText(Context, "222"+filter.size() +" / "+filter, Toast.LENGTH_SHORT).show();
            }else{
                results.count = original.size();
                results.values=original;
                Toast.makeText(Context, ""+original.size() +" / "+original, Toast.LENGTH_SHORT).show();
            }
            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            data.clear();
            data.addAll((ArrayList<classBidAttributes>) results.values);
            notifyDataSetChanged();
        }
    }

希望对您有所帮助:)

Answer 2

我终于设法让它正常工作，没有任何错误，结果是循环是问题的根源，最好避免正常的 for 循环，而是使用 foreach 循环，我不得不为搜索适配器从头开始重新编写整个代码，但如下所示：

         public void filter(CharSequence constraint) {
           constraint = constraint.toString();

           data.clear();
           if(constraint.length() == 0){
               data.addAll(original);
           }else{
               for(classBidAttributes filts : original){
                           if(filts.getTitle().contains(constraint)
                           || filts.getbidid().contains(constraint)
                           || filts.getbid_offer().contains(constraint)
                           || filts.getCategory().contains(constraint)
                           || filts.getDescription().contains(constraint)
                           || filts.getQuantity().contains(constraint)
                           || filts.getRepetitive_requests_yes().contains(constraint)
                           || filts.getRepetitive_requests_no().contains(constraint)
                           || filts.getExpiry_date().contains(constraint)){
                       data.add(filts);
                   }

               }
           }
           notifyDataSetChanged();
       };

然而这个片段是基于你的回答 :)

当搜索功能启动并更新适配器时，自定义 ListView 会删除列表项中除匹配搜索值之外的所有内容

when the search function starts and the adapter is updated the custom ListView removes every thing in the list item except the matching search value

search

android

listview

filter

android-arrayadapter