我想向DecksList小部件提供流，所以我在MyApp中初始化了提供程序。它引发ProviderNotFoundError。发生这种行为的原因可能是什么？
I/flutter (27768): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (27768): The following ProviderNotFoundError was thrown building NotificationListener<KeepAliveNotification>:
I/flutter (27768): Error: Could not find the correct Provider<Stream<List<Deck>>> above this DecksList Widget
打开图像以查看MyApp小部件： app widget
Home小部件内的DecksList：
class DecksList extends StatefulWidget {
@override
_DecksListState createState() => _DecksListState();
}
class _DecksListState extends State<DecksList> {
Stream<List<Deck>> decks;
@override
void didChangeDependencies() {
super.didChangeDependencies();
decks = Provider.of<Stream<List<Deck>>>(context);
}
@override
Widget build(BuildContext context) {
return StreamBuilder<List<Deck>>(
stream: decks,
builder: (context, snapshot) {
final decksList = snapshot.data ?? List();
return ListView.builder(
// to scroll lists together
physics: ClampingScrollPhysics(),
shrinkWrap: true,
itemCount: decksList.length,
itemBuilder: (BuildContext context, int index) {
final Deck itemDeck = decksList[index];
return DeckTile(
deckItem: itemDeck,
onPressed: () {
Navigator.push(context,
CupertinoPageRoute(builder: (BuildContext context) {
return FlashcardsDeck(
deckId: itemDeck.id,
);
}));
},
onLongPress: () {},
);
},
);
});
}
}