在我的应用程序中，当我登录一个帐户（让他称为“ user1”）然后注销该用户，然后登录第二个帐户（“ user2”）时，我的StreamProvider从Firebase获取正确的UID的新用户，但下面使用该“ uid”的StreamProvider仍显示前一个用户的数据。
这是一个问题，因为例如在我的StreamProvider 中，它是从user1而不是从user2获取锻炼的，...在重新启动应用程序后，它会自行修复，但我需要它在没有重新启动
所以我想我的问题是，“我做错了什么？”或“当User / user.uid的值更改时，如何“重新创建”我的StreamProvider（使用UID）
预先感谢
这是我main.dart中的代码，其中包含我的所有提供程序
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
return MultiProvider(
providers: [
StreamProvider<User>(
create: (_) => AuthService().user,
),
],
child: Builder(
builder: (BuildContext context) {
final user = Provider.of<User>(context) ?? null;
return MultiProvider(
providers: [
StreamProvider<List<Exercise>>(
create: (_) => DatabaseService().exercises,
),
StreamProvider<List<ExerciseCategory>>(
create: (_) => DatabaseService().categories,
),
StreamProvider<List<ExerciseEquipment>>(
create: (_) => DatabaseService().equipment,
),
StreamProvider<List<notification.Notification>>(
create: (_) => DatabaseService().notifications,
),
ChangeNotifierProvider<ExerciseFilter>(
create: (_) => ExerciseFilter(),
),
ChangeNotifierProvider<WorkoutChangeNotifier>(
create: (_) => WorkoutChangeNotifier(),
),
StreamProvider<List<UserExercise>>(
create: (_) =>
DatabaseService(uid: user != null ? user.uid : '')
.userExercises,
),
StreamProvider<List<WorkoutStreamProvider>>(
create: (_) =>
DatabaseService(uid: user != null ? user.uid : '').workouts,
),
StreamProvider<List<WorkoutHistory>>(
create: (_) =>
DatabaseService(uid: user != null ? user.uid : '')
.workoutHistory,
),
StreamProvider<UserSettings>(
create: (_) =>
DatabaseService(uid: user != null ? user.uid : '').settings,
),
StreamProvider<Nutrition>(
create: (_) =>
DatabaseService(uid: user != null ? user.uid : '')
.nutrition,
),
],
child: MaterialApp(
theme: ThemeData(
primarySwatch: Colors.grey,
primaryTextTheme: TextTheme(
headline6: TextStyle(color: Colors.black, fontSize: 16.0),
),
fontFamily: "Circular",
backgroundColor: Colors.blueAccent,
),
home: Wrapper(),
),
);
},
),
);
}
}
编辑1：获取锻炼代码
List<WorkoutStreamProvider> _workoutStreamProviderListFromSnapshot(
DocumentSnapshot snapshot,
) {
//
WorkoutExerciseSet _buildWorkoutExerciseSet(dynamic _set) {
return WorkoutExerciseSet(
reps: _set['reps'] ?? 0,
weight: _set['weight'] ?? 0.0,
);
}
List<WorkoutExerciseSet> _buildWorkoutExerciseSetList(dynamic sets) {
List<WorkoutExerciseSet> setList = [];
for (int i = 0; i < sets.length; i++) {
setList.add(_buildWorkoutExerciseSet(sets[i]));
}
return setList;
}
WorkoutExercise _buildWorkoutExercise(dynamic exercise) {
return WorkoutExercise(
name: exercise['exerciseName'] ?? '',
category: exercise['exerciseCategory'] ?? '',
equipment: exercise['exerciseEquipment'] ?? '',
restEnabled: exercise['restEnabled'] ?? true,
restSeconds: exercise['restSeconds'] ?? 60,
hasNotes: exercise['hasNotes'] ?? false,
notes: exercise['notes'] ?? '',
sets: _buildWorkoutExerciseSetList(exercise['sets']),
);
}
List<WorkoutExercise> _buildWorkoutExerciseList(List<dynamic> exercises) {
List<WorkoutExercise> workoutExerciseList = [];
for (int i = 0; i < exercises.length; i++) {
workoutExerciseList.add(
_buildWorkoutExercise(exercises[i]),
);
}
return workoutExerciseList;
}
WorkoutStreamProvider _buildWorkout(dynamic workout) {
return WorkoutStreamProvider(
id: workout['id'] ?? '',
name: workout['workoutName'] ?? '',
workoutNote: workout['workoutNote'] ?? '',
exercises: _buildWorkoutExerciseList(workout['exercises']),
);
}
List<WorkoutStreamProvider> workoutList = [];
if (snapshot.exists && snapshot.data != null) {
if (snapshot.data['workouts'] != null) {
List<dynamic> workouts = snapshot.data['workouts'];
for (int i = 0; i < workouts.length; i++) {
workoutList.add(_buildWorkout(workouts[i]));
}
}
}
return workoutList;
}
Stream<List<WorkoutStreamProvider>> get workouts {
print("GETTING WORKOUTS OF UID: " + uid);
return userCollection
.document(uid)
.snapshots()
.map(_workoutStreamProviderListFromSnapshot);
}
UI
class WorkoutListWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
final List<WorkoutStreamProvider> dbWorkouts =
Provider.of<List<WorkoutStreamProvider>>(context) ?? [];
final User user = Provider.of<User>(context) ?? null;
final WorkoutChangeNotifier workout =
Provider.of<WorkoutChangeNotifier>(context) ?? null;
return ReorderableSliverList(
delegate: ReorderableSliverChildListDelegate(
[
for (int i = 0; i < dbWorkouts.length; i++)
Container(
margin: EdgeInsets.all(16.0),
child: InkWell(
onTap: () {
workout.workoutStreamProviderToChangeNotifier(dbWorkouts[i]);
Navigator.push(
context,
MaterialPageRoute(
builder: (BuildContext context) => WorkoutViewPage(),
),
);
},
child: Container(
padding: EdgeInsets.fromLTRB(8.0, 0.0, 8.0, 8.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(6.0),
border: Border.all(
color: Colors.grey[400],
width: 1,
),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Container(
padding: EdgeInsets.only(left: 16.0),
child: Text(
dbWorkouts[i].name,
style: TextStyle(
fontSize: 16.0,
fontWeight: FontWeight.w500,
),
),
),
Theme(
data: Theme.of(context).copyWith(
cardColor: Color.fromRGBO(35, 35, 35, 1),
dividerColor: Color.fromRGBO(70, 70, 70, 1),
),
child: PopupMenuButton(
offset: Offset(0, 50),
shape: RoundedRectangleBorder(
borderRadius:
BorderRadius.all(Radius.circular(8.0)),
),
icon: Icon(
Icons.more_vert,
),
onSelected: (selection) async {
if (selection == 'edit') {
print('EDIT WORKOUT');
workout.workoutStreamProviderToChangeNotifier(
dbWorkouts[i]);
Navigator.push(
context,
MaterialPageRoute(
builder: (BuildContext context) =>
WorkoutEditPage(),
),
);
} else if (selection == 'duplicate') {
print('DUPLICATE WORKOUT');
dynamic result = await DatabaseService(
uid: user != null ? user.uid : '',
).duplicateWorkout(dbWorkouts[i], dbWorkouts);
if (result != null) {
print("Workout Duplicated");
}
} else if (selection == 'delete') {
dynamic result = await DatabaseService(
uid: user != null ? user.uid : '',
).removeWorkout(dbWorkouts[i], dbWorkouts);
if (result != null) {
print("Workout Deleted");
}
}
},
itemBuilder: (BuildContext context) =>
<PopupMenuItem>[
PopupMenuItem(
height: 40.0,
value: 'edit',
child: Text(
'Edit workout',
style: TextStyle(
color: Colors.white,
fontSize: 17.0,
),
),
),
PopupMenuItem(
height: 40.0,
value: 'duplicate',
child: Text(
'Duplicate workout',
style: TextStyle(
color: Colors.white,
fontSize: 17.0,
),
),
),
PopupMenuItem(
height: 40.0,
value: 'delete',
child: Text(
'Delete workout',
style: TextStyle(
color: Colors.white,
fontSize: 17.0,
),
),
),
],
),
),
],
),
for (int j = 0; j < dbWorkouts[i].exercises.length; j++)
Container(
padding: EdgeInsets.symmetric(
horizontal: 16.0, vertical: 2.0),
child: Text(dbWorkouts[i].exercises[j].equipment == ""
? dbWorkouts[i]
.exercises[j]
.sets
.length
.toString() +
' x ' +
dbWorkouts[i].exercises[j].name
: dbWorkouts[i]
.exercises[j]
.sets
.length
.toString() +
' x ' +
dbWorkouts[i].exercises[j].name +
" (" +
dbWorkouts[i].exercises[j].equipment +
")"),
),
],
),
),
),
),
],
),
onReorder: (int oldIndex, int newIndex) {
// Move Workout
dynamic result = DatabaseService(
uid: user != null ? user.uid : '',
).reorderWorkout(oldIndex, newIndex, dbWorkouts);
},
);
}
}
答案 0 :(得分：1)
我设法通过在构建器内部的Multiprovider周围放置一个if来解决问题，如果用户不存在，则返回SignIn（）屏幕，否则返回包含提供者和Wrapper（）的multiprovider
通过这种方式，我强制用户界面根据用户提供程序中的更改进行重建，并且通过强制用户界面进行重建，必须使用新的UID调用我的DatabaseService（）函数
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
return MultiProvider(
providers: [
StreamProvider<User>(
create: (_) => AuthService().user,
),
],
child: Builder(
builder: (BuildContext context) {
final user = Provider.of<User>(context) ?? null;
return user == null
? MaterialApp(
theme: ThemeData(
primarySwatch: Colors.grey,
primaryTextTheme: TextTheme(
headline6: TextStyle(color: Colors.black, fontSize: 16.0),
),
fontFamily: "Circular",
backgroundColor: Colors.blueAccent,
),
home: SignIn(),
)
: MultiProvider(
providers: [
StreamProvider<List<Exercise>>(
create: (_) => DatabaseService().exercises,
),
StreamProvider<List<ExerciseCategory>>(
create: (_) => DatabaseService().categories,
),
StreamProvider<List<ExerciseEquipment>>(
create: (_) => DatabaseService().equipment,
),
StreamProvider<List<notification.Notification>>(
create: (_) => DatabaseService().notifications,
),
ChangeNotifierProvider<ExerciseFilter>(
create: (_) => ExerciseFilter(),
),
ChangeNotifierProvider<WorkoutChangeNotifier>(
create: (_) => WorkoutChangeNotifier(),
),
StreamProvider<List<UserExercise>>(
create: (_) =>
DatabaseService(uid: user != null ? user.uid : '')
.userExercises,
),
StreamProvider<List<WorkoutStreamProvider>>(
create: (_) =>
DatabaseService(uid: user != null ? user.uid : '')
.workouts),
StreamProvider<List<WorkoutHistory>>(
create: (_) =>
DatabaseService(uid: user != null ? user.uid : '')
.workoutHistory,
),
StreamProvider<UserSettings>(
create: (_) =>
DatabaseService(uid: user != null ? user.uid : '')
.settings,
),
StreamProvider<Nutrition>(
create: (_) =>
DatabaseService(uid: user != null ? user.uid : '')
.nutrition,
),
],
child: MaterialApp(
theme: ThemeData(
primarySwatch: Colors.grey,
primaryTextTheme: TextTheme(
headline6:
TextStyle(color: Colors.black, fontSize: 16.0),
),
fontFamily: "Circular",
backgroundColor: Colors.blueAccent,
),
home: Wrapper(),
),
);
},
),
);
}
}