当搜索功能启动和适配器进行更新定制的ListView删除列表中的项目的每一件事情，除了匹配搜索值

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(); 
     } 
    } 

---

我猜问题是在“data.clear()，notifyDataSetChanged()”但我不知道这里有什么错。

我已经添加了图片，解释执行搜索时发生的情况。

hopfully这是这个问题所需的每一件事情，如果你需要检查任何事情问我。

Answer 1

你的猜测是正确的。您在data.clear()中犯了错误。通过这样做，您可以清除适配器的完整数据并添加最后的搜索结果。所以下次你无法获得原始数据再次开始过滤。

您应该将原始数据保存在另一个列表中，以便稍后使用适配器数据更新它。

您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(); 
     } 
    } 

希望它能帮助:)

Answer 2

我终于成功地使其与没有错误正常工作什么那么，它竟然是循环是问题的根源，它最好避开正常的循环，而使用foreach循环，我必须从头rewirte整个代码的搜索适配器，但如下：

  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(); 
     }; 

不过这个片断是基于你的答案:)