How to rebuild StreamBuilder on resumed state with Flutter - flutter

Question

I develop an app using BLoC pattern.
In my app there are 2 routes, route A and B, and both of them access same data.
A problem caused when moving the routes as below.
Move to route B from route A that shows the data.
Update the data at route B.
Back to route A.
After moving back to route A, the StreamBuilder of showing the data never updates automatically.
How can I let the StreamBuilder update on resumed state?
Here are sample codes.
routeA.dart
class RouteA extends StatefulWidget {
#override
_RouteAState createState() => _RouteAState();
}
class _RouteAState extends State<RouteA> {
#override
Widget build(BuildContext context) {
final bloc = Bloc();
return Column(
children: [
StreamBuilder( // this StreamBuilder never updates on resumed state
stream: bloc.data, // mistake, fixed. before: bloc.count
builder: (_, snapshot) => Text(
snapshot.data ?? "",
)),
RaisedButton(
child: Text("Move to route B"),
onPressed: () {
Navigator.of(context).pushNamed("routeB");
},
),
],
);
}
}
routeB.dart
class RouteB extends StatefulWidget {
#override
_RouteBState createState() => _RouteBState();
}
class _RouteBState extends State<RouteB> {
#override
Widget build(BuildContext context) {
final bloc = Bloc();
return Center(
child: RaisedButton(
child: Text("Update data"),
onPressed: () {
bloc.update.add(null);
},
),
);
}
}
bloc.dart
class Bloc {
Stream<String> data;
Sink<void> update;
Model _model;
Bloc() {
_model = Model();
final update = PublishSubject<void>();
this.update = update;
final data = BehaviorSubject<String>(seedValue: "");
this.data = data;
update.map((event) => _model.update()).listen((event) => data.sink.add(_model.getData()));
}
}
model.dart
class Model {
static Model _model;
factory Model() { // model is singleton.
_model ??= Model._();
return _model;
}
Model._();
int _data = 0;
void update() {
_data++;
}
String getData() {
return _data.toString();
}
}

Answer 1

StreamBuilder updates the data whenever it gets changed not when just by calling stream
RouteA
class RouteA extends StatefulWidget {
#override
_RouteAState createState() => _RouteAState();
}
class _RouteAState extends State<RouteA> {
#override
Widget build(BuildContext context) {
return Column(
children: [
StreamBuilder( // this StreamBuilder never updates on resumed state
stream: bloc.data, // mistake, fixed. before: bloc.count
builder: (_, snapshot) => Text(
snapshot.data ?? "",
)),
RaisedButton(
child: Text("Move to route B"),
onPressed: () {
Navigator.of(context).push(MaterialPageRoute(builder: (ctx) {
return RouteB();
}));
},
),
],
);
}
}
Route B
class RouteB extends StatefulWidget {
#override
_RouteBState createState() => _RouteBState();
}
class _RouteBState extends State<RouteB> {
#override
Widget build(BuildContext context) {
return Center(
child: RaisedButton(
child: Text("Update data"),
onPressed: () {
bloc.updateData();
},
),
);
}
}
Bloc
class Bloc {
final _update = PublishSubject<String>();
Model _model = Model();
Stream<String> get data => _update.stream;
void updateData() async {
_model.update();
_update.sink.add(_model.getData());
_update.stream.listen((event) {
print(event);
});
}
dispose() {
_update.close();
}
}
final bloc = Bloc();
just follow above changes, it will do the trick for you.