如何使用 SearchView 过滤 FirestoreRecyclerAdapter

Question

我一直在尝试“过滤”一组使用 FirestoreRecyclerAdapter 从 Firestore 获取的数据。下面是实现场景的“适配器”：

RecyclerAdapter.java

public class IncidentsRecyclerAdapter extends FirestoreRecyclerAdapter<Incidents, IncidentsRecyclerAdapter.IncidentsHolder> implements Filterable {
    private OnItemClickListener listener;
    private ObservableSnapshotArray<Incidents> list;
    private ArrayList<Incidents> listFull;

    public IncidentsRecyclerAdapter(@NonNull FirestoreRecyclerOptions<Incidents> options) {
        super(options);
        this.list = options.getSnapshots();
        this.listFull = new ArrayList<>(options.getSnapshots());
    }

    @SuppressLint("SetTextI18n")
    @Override
    protected void onBindViewHolder(@NonNull IncidentsHolder holder, int position, @NonNull Incidents model) {
        Picasso.get()
                .load(model.getIncident_image_one())
                .placeholder(R.mipmap.ic_launcher)
                .fit()
                .centerCrop()
                .into(holder.imageViewIncident);

        holder.textViewName.setText(model.getUser_name());
        holder.textViewDateTime.setText(model.getIncident_timestamp());
        holder.textViewDescription.setText(model.getIncident_location() + "/" + model.getIncident_desc());
    }

    @NonNull
    @Override
    public IncidentsHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.incident_item,
                parent, false);
        return new IncidentsHolder(v);
    }

    @Override

    public Filter getFilter() {
        return dataFilter;
    }

    private Filter dataFilter = new Filter() {
        @Override
        // Will be executed in a background thread
        protected FilterResults performFiltering(CharSequence constraint) {
            List<Incidents> filteredList = new ArrayList<>();

            if(constraint == null || constraint.length() == 0) {
                filteredList.addAll(listFull);
            } else {
                String filterPattern = constraint.toString().toLowerCase().trim();
                for (Incidents item : listFull) {
                    if(item.toString().toLowerCase().contains(filterPattern)) {
                        filteredList.add(item);
                    }
                }
            }
            FilterResults filterResults = new FilterResults();
            filterResults.values = filteredList;
            return filterResults;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            list.clear();
            list.addAll((Collection<? extends Incidents>) results.values);
            notifyDataSetChanged();
        }
    };
}

只要按下工具栏上的搜索图标，RecyclerView 就会消失，并且搜索过滤器会自动不起作用。

我认为我在将 Firestorecycleroptions 转换为 ArrayList 时做错了。

更新
根据link，Firebase 不支持对文本字段进行全文搜索。此外，尝试一种解决方法，我可以将FirestoreRecyclerAdapter 数据转换为原始String、List 或Array 类型，以便可以实现本地搜索。 Algolia/ElastiSeacrch 可能是一个难以处理的负担。 如果此更新错误或不合逻辑，请指导

Answer 1

只需从构造函数中删除 Firestorerecycleroptions 并仅使用您的列表而不调用 super()：

public IncidentsRecyclerAdapter(List<Incidents> list) {
    this.list = list;
    this.listFull = new ArrayList<>(list);
}