I have a Wallpaper App and it uses Firestore to store the wallpapers.

I want to use Hive to store a list of wallpapers from cloud firestore but how to save the List of Wallpapers and retrieve it later?

When I try to save the list I get this error:

E/flutter ( 9995): [ERROR:flutter/shell/common/shell.cc(199)] Dart Error: Unhandled exception: E/flutter ( 9995): HiveError: Cannot write, unknown type: Wallpaper. Did you forget to register an adapter?

Code:

class Wallpaper extends HiveObject {


  String date;
  String url;

  Wallpaper();

}

static Future<void> addWallpapers({@required String boxName, @required List<Wallpaper> wallpapers}) async {

    var box = await Hive.openBox(boxName);
    box.put(boxName, wallpapers);

    print("WALLPAPER ADICIONADO NO HIVE!");

  }

  static Future<List<Wallpaper>> getWallpapers({@required String boxName}) async {

    var box = await Hive.openBox(boxName);

    List<Wallpaper> wallpapers = box.get("latest");

    return wallpapers;

  }