如何在RealmRecyclerViewAdapter中实现可过滤

我正在使用RealmRecyclerViewAdapter。 我的问题是实施一个Filterable 。 这是代码：

  private class AirportAdapter extends RealmRecyclerViewAdapter<AirportR,RecyclerView.ViewHolder> implements Filterable { Context context; OrderedRealmCollection<AirportR>listAirports; public AirportAdapter(Context activity, OrderedRealmCollection<AirportR>airports) { super(activity,airports, true); this.context = activity; this.listAirports = airports; } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.airport_show, parent,false); AirportClass holder = new AirportClass(view); return holder; } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { AirportR airportR = listAirports.get(position); AirportClass mHolder = (AirportClass)holder; mHolder.country.setText(airportR.getIsoCountry()); mHolder.name.setText(airportR.getName()); } public Filter getFilter() { AirportFilter filter = new AirportFilter(this, listAirports); return filter; } private class AirportFilter extends Filter { private final AirportAdapter adapter; OrderedRealmCollection<AirportR>originalList; OrderedRealmCollection<AirportR>filteredList; private AirportFilter(AirportAdapter adapter, OrderedRealmCollection<AirportR> originalList) { super(); this.adapter = adapter; this.originalList = originalList; } @Override protected FilterResults performFiltering(CharSequence constraint) { filteredList.clear(); final FilterResults results = new FilterResults(); if (constraint.length() == 0) { filteredList.addAll(originalList); } else { final String filterPattern = constraint.toString().toLowerCase().trim(); for (final AirportR airportR : originalList) { if (airportR.getName().toLowerCase().contains(filterPattern)) { filteredList.add(airportR); } } } results.values = filteredList; results.count = filteredList.size(); return results; } @Override protected void publishResults(CharSequence constraint, FilterResults results) { adapter.listAirports.addAll((OrderedRealmCollection<AirportR>) results.values); adapter.notifyDataSetChanged(); } } private class AirportClass extends RecyclerView.ViewHolder { TextView name, country; ImageView image; public AirportClass(View itemView) { super(itemView); name = (TextView)itemView.findViewById(R.id.name); country = (TextView)itemView.findViewById(R.id.country); image = (ImageView)itemView.findViewById(R.id.imageView); } } } 

我回报了这个错误：

 java.lang.UnsupportedOperationException: This method is not supported by RealmResults. at io.realm.RealmResults.addAll(RealmResults.java:710) at com.example.matteo.downloadairports.fragment.ListAirportFragment$AirportAdapter$AirportFilter.publishResults 

我过滤并更新适配器后，如何保存结果？

谢谢

Answer 1

将筛选移至publishResults并使用UI线程Realm的查询来评估新结果。

 private class AirportAdapter extends RealmRecyclerViewAdapter<AirportR, RecyclerView.ViewHolder> implements Filterable { Realm realm; public AirportAdapter(Context context, Realm realm, OrderedRealmCollection<AirportR> airports) { super(context, airports, true); this.realm = realm; } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.airport_show, parent, false); AirportClass holder = new AirportClass(view); return holder; } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { AirportR airportR = getData().get(position); AirportClass mHolder = (AirportClass) holder; mHolder.country.setText(airportR.getIsoCountry()); mHolder.name.setText(airportR.getName()); } public void filterResults(String text) { text = text == null ? null : text.toLowerCase().trim(); RealmQuery<AirportR> query = realm.where(AirportR.class); if(!(text == null || "".equals(text))) { query.contains("fieldToQueryBy", text, Case.INSENSITIVE) // TODO: change field } updateData(query.findAll()); } public Filter getFilter() { AirportFilter filter = new AirportFilter(this); return filter; } private class AirportFilter extends Filter { private final AirportAdapter adapter; private AirportFilter(AirportAdapter adapter) { super(); this.adapter = adapter; } @Override protected FilterResults performFiltering(CharSequence constraint) { return new FilterResults(); } @Override protected void publishResults(CharSequence constraint, FilterResults results) { adapter.filterResults(constraint.toString()); } } private class AirportClass extends RecyclerView.ViewHolder { TextView name, country; ImageView image; public AirportClass(View itemView) { super(itemView); name = (TextView) itemView.findViewById(R.id.name); country = (TextView) itemView.findViewById(R.id.country); image = (ImageView) itemView.findViewById(R.id.imageView); } } }