[英]Flutter : How to use Riverpod with SharedPreference and List<String> Variable in multipage?
I've create List<String> favId = [];
我创建List<String> favId = [];
variable to store item's ID with SharedPreferences, so the favorited items ID didnt lost after I restart the application.使用 SharedPreferences 存储项目 ID 的变量,因此我重新启动应用程序后收藏的项目 ID 不会丢失。 And here is my SharedPreferences method and favorite IconButton in detailDoaPage.dart:这是我的 SharedPreferences 方法和最喜欢的 IconButton 的详细信息DoaPage.dart:
...
static List<String> favId = [];
getData() async {
SharedPreferences pref = await SharedPreferences.getInstance();
setState(() {
favId = pref.getStringList("id") ?? [];
});
}
void initState() {
super.initState();
getIds();
}
getIds() async {
favId = getData();
}
void saveData() async {
SharedPreferences pref = await SharedPreferences.getInstance();
pref.setStringList("id", favId);
}
...
IconButton(
icon: Icon(
favId.contains(doa.id.toString())
? Icons.favorite
: Icons.favorite_border,
color: favId.contains(doa.id.toString())
? Colors.red
: Colors.grey,
),
onPressed: () => setState(() {
doa.fav = !doa.fav;
if (favId.contains(doa.id.toString())) {
favId.removeWhere(
(element) => element == doa.id.toString());
} else {
favId.add(doa.id.toString());
}
saveData();
favId.sort();
}),
)
Beside that, I also want to show the favorited item's with ListView.builder in favPage.dart (another page).除此之外,我还想在 favPage.dart(另一页)中使用 ListView.builder 显示收藏的项目。 Of course I want get the favId from detailDoaPage.dart.当然,我想从 detailDoaPage.dart 中获取 favId。 How can I implement the provider/riverpod across this 2 pages?如何在这 2 个页面上实现提供程序/riverpod?
Here is the preview of my app:这是我的应用程序的预览:
Thank you:)谢谢:)
My recommended approach would be to create a StateNotifier that handles the state as well as the interactions with SharedPreferences.我推荐的方法是创建一个 StateNotifier 来处理 state 以及与 SharedPreferences 的交互。 The following simplifies the logic in your widgets as well.以下内容也简化了小部件中的逻辑。
final sharedPrefs =
FutureProvider<SharedPreferences>((_) async => await SharedPreferences.getInstance());
class FavoriteIds extends StateNotifier<List<String>> {
FavoriteIds(this.pref) : super(pref?.getStringList("id") ?? []);
static final provider = StateNotifierProvider<FavoriteIds, List<String>>((ref) {
final pref = ref.watch(sharedPrefs).maybeWhen(
data: (value) => value,
orElse: () => null,
);
return FavoriteIds(pref);
});
final SharedPreferences? pref;
void toggle(String favoriteId) {
if (state.contains(favoriteId)) {
state = state.where((id) => id != favoriteId).toList();
} else {
state = [...state, favoriteId];
}
// Throw here since for some reason SharedPreferences could not be retrieved
pref!.setStringList("id", state);
}
}
Usage:用法:
class DoaWidget extends ConsumerWidget {
const DoaWidget({Key? key, required this.doa}) : super(key: key);
final Doa doa;
@override
Widget build(BuildContext context, ScopedReader watch) {
final favoriteIds = watch(FavoriteIds.provider);
return IconButton(
icon: favoriteIds.contains('') ? Icon(Icons.favorite) : Icon(Icons.favorite_border),
color: favoriteIds.contains('') ? Colors.red : Colors.grey,
onPressed: () => context.read(FavoriteIds.provider.notifier).toggle(doa.id.toString()),
);
}
}
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