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java - java.lang.ClassCastException：java.util.ArrayList 无法转换为 com.parse.ParseObject

问题描述

我目前正在开发一个从解析服务器获取数据的安卓应用程序。我想使用 searchview 过滤我的 recyclerView。但它在搜索时什么也没显示。它在这一行中显示错误 mRooms = (ArrayList) filterResults.values; 请帮助我编辑有关此问题的代码。

RoomCardRecyclerViewAdapter

 private List<ParseObject> mRooms = new ArrayList<>();
 private ParseObject room;
 private String mSection;
 private Context context;

 public RoomCardRecyclerViewAdapter(){
    super(DIFF_CALLBACK);
 }
 public static final DiffUtil.ItemCallback<ParseObject>  DIFF_CALLBACK = new 
 DiffUtil.ItemCallback<ParseObject>() {
    @Override
    public boolean areItemsTheSame(@NonNull ParseObject oldItem, @NonNull ParseObject newItem) {
        return oldItem.getObjectId() == newItem.getObjectId();
    }

    @Override
    public boolean areContentsTheSame(@NonNull ParseObject oldItem, @NonNull ParseObject newItem) {
        return (oldItem.getUpdatedAt().equals(newItem.getUpdatedAt()) && 
 oldItem.getCreatedAt().equals(newItem.getCreatedAt()));
    }
};


public RoomCardRecyclerViewAdapter(String section) {
    this();

    this.mSection = section;
}
public RoomCardRecyclerViewAdapter(Context context, List<ParseObject>arrayList) {
    this();

    this.context = context;
    mRooms = arrayList;
     
}


@Override
public RoomViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    //inflating the viewholder with the appropriate views
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.room_cardview, parent, 
false);

    return new RoomViewHolder(parent.getContext(), view);
}

@Override
public void onBindViewHolder(@NonNull RoomViewHolder holder, int position) {
    room = getItem(position);

     holder.mRoomLocation.setText(room.getString("roomSuburb"));
    holder.mRoomPrice.setText(Integer.toString(room.getInt("roomMonthlyRent")));
    holder.mInclusiveOrNot.setText(room.getString("roomRentInclusiveOfBills"));
    holder.mPropertyType.setText(room.getString("roomPropertyType"));
    holder.mNumOfBeds.setText(Integer.toString(room.getInt("roomBedrooms")));
    holder.mNumOfBaths.setText(Integer.toString(room.getInt("roomBathrooms")));


  }
  @Override
  public Filter getFilter(){
  return new Filter() {
      @Override
      protected FilterResults performFiltering(CharSequence charSequence) {

FilterResults filterResults = new FilterResults();

          String charString = charSequence.toString();
if (charString.isEmpty()){
     filterResults.values = mRooms;
    filterResults.count = mRooms.size();

}else {
List<ParseObject> filteredList = new ArrayList<>();
for (ParseObject parseObject : mRooms){
    if (parseObject.getString("roomSuburb").toLowerCase().contains(charString.toLowerCase())){
        filteredList.add(parseObject);
    }
}
     filterResults.values = filteredList;
filterResults.count= filteredList.size();
}

return filterResults;

      }

      @Override
      protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
          mRooms = (ArrayList<ParseObject>) filterResults.values;
          notifyDataSetChanged();
      }
  };

}

标签： javaandroidparse-platform

解决方案

您只需要调用 notifyDataSetChanged() 如下 -

用这个

 @Override
 protected void publishResults(CharSequence charSequence, FilterResults 
 filterResults) { 
     if (filterResults!= null && results.count > 0) {
         notifyDataSetChanged();
     } else {
         notifyDataSetInvalidated();
     }
 }

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