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Android - Realm - Object delete - Object is no longer valid to operate on

由 谁说胖子不能爱 提交于 2019-12-01 15:49:18

Okay so you're calling adapter.notifyDataSetChanged(), so any other notify___ method is unnecessary (data set change disables animations anyways.)

In which case the easiest (and most efficient) way of doing things would be to use the RealmResults directly rather than retrieving every element into an ArrayList which is then used the exact same way.

So it should be like this

public static RealmResults<City> getStoredCities(){
        RealmQuery<City> query = getRealmInstance().where(City.class);
        return realm.where(City.class)
                        .findAllSorted("timestamp", Sort.DESCENDING);
}

And

public static void removeCity(City city){
        final String cityName = city.getCityName();
        realm.executeTransaction(new Realm.Transaction() {
            @Override
            public void execute(Realm realm) {
                RealmResults<City> result = realm.where(City.class).equalTo("cityName", cityName).findAll();
                result.deleteAllFromRealm();
            }
        });
}

And

builder.setPositiveButton(getString(R.string.ok), new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialogInterface, int i) {
        RealmHelper.removeCity(getItem(position));
    }
});

And

// dependency: compile 'io.realm:android-adapters:1.3.0' 
// <-- for Realm 3.x+, use 2.0.0
// for Realm 5.x+, use 3.0.0
public class CityListAdapter extends RealmRecyclerViewAdapter<City, CityListViewHolder> { 

    OnItemClickListener onItemClickListener;
    OnItemLongClickListener onItemLongClickListener;

    public CityListAdapter(@NonNull Context context, 
                           @Nullable OrderedRealmCollection<City> data, 
                           OnItemClickListener onItemClickListener, 
                           OnItemLongClickListener onItemLongClickListener) {
        super(context, data, true);
        this.onItemClickListener = onItemClickListener;
        this.onItemLongClickListener = onItemLongClickListener;
    }


    @Override
    public CityListViewholder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.city_item_navigation_viewholder, parent, false);
        CityListViewholder cityListViewholder = new CityListViewholder(view, parent.getContext());
        return cityListViewholder;
    }

    @Override
    public void onBindViewHolder(CityListViewholder holder, int position) {
        holder.cityName.setText(getItem(position).getCityName());
        holder.bindClick(position, onItemClickListener);
        holder.bindLongClick(position, onItemLongClickListener);
    }

    public static class CityListViewholder extends RecyclerView.ViewHolder {
        TextView cityName;
        ImageView cityIcon;

        public CityListViewholder(View itemView, 
                                  Context context) {
            super(itemView);
            cityName = (TextView)itemView.findViewById(R.id.city_name);
            cityIcon = (ImageView)itemView.findViewById(R.id.city_icon);
        }

        public void bindClick(final int position, final OnItemClickListener onItemClickListener){
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    onItemClickListener.onItemClick(position);
                }
            });
        }

        public void bindLongClick(final int position, final OnItemLongClickListener onItemLongClickListener) {
            itemView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View view) {
                    onItemLongClickListener.onItemLongClick(position);
                    return true;
                }
            });
        }
    }
}

Using RealmRecyclerViewAdapter will call notifyDataSetChanged() whenever your results change.

标签
android
realm
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