我正在咨询数据库中注册的所有俱乐部。对于每个俱乐部，我都会将其添加到对象列表中。
当该人删除俱乐部时，会从数据库中删除俱乐部，但在项目列表中未删除，我尝试执行以下操作：
我的 NotClub-Player.dart 类
// FIREBASE CLUBS
List<Club> items = List();
Club item;
DatabaseReference itemRef;
@override
void initState() {
super.initState();
item = Club("","","",0,"","","","",0,0,false,"","","","","",false,"","","","","","","","","","","");
final FirebaseDatabase database = FirebaseDatabase.instance;
itemRef = database.reference().child(player.player_game_platform).child("CLUB");
itemRef.onChildAdded.listen(_onEntryAdded);
itemRef.onChildRemoved.listen(_onEntryRemoved);
itemRef.onChildChanged.listen(_onEntryChanged);
}
// CLUBS LISTENERS
_onEntryAdded(Event event) {
setState(() {
items.add(Club.fromSnapshot(event.snapshot));
});
}
_onEntryRemoved(Event event) {
setState(() {
items.remove(Club.fromSnapshot(event.snapshot));
});
}
_onEntryChanged(Event event) {
var old = items.singleWhere((entry) {
return entry.key == event.snapshot.key;
});
setState(() {
items[items.indexOf(old)] = Club.fromSnapshot(event.snapshot);
});
}
我的问题：
In _onEntryRemoved有一个事件。在这种情况下，它会返回已删除的项目。但它不会从列表中删除相应的项目。
在数据库中，已成功删除。但包含该对象的列表尚未删除它。
这是我的查询
rnew Flexible(
child: new FirebaseAnimatedList(
query: FirebaseDatabase.instance.reference().child(player.player_game_platform).child("CLUB").orderByChild("club_name"),
itemBuilder: (BuildContext context, DataSnapshot snapshot,
Animation<double> animation, int index) {
return new Column(
children: <Widget>[
new Container(
decoration: new BoxDecoration(
color: Colors.grey[300],
),
child: new ListTile(
leading: new CachedNetworkImage(imageUrl: items[index].club_logo, width: 60.0),
title: new Text(items[index].club_name, style: new TextStyle(color: Colors.black)),
subtitle: new Text("CAPTAIN: "+items[index].club_captain, style: new TextStyle(color: Colors.black)),
trailing: new RaisedButton(
color: Colors.lightBlue[500],
child: new Text("JOIN", style: new TextStyle(color: Colors.white)),
onPressed: (){
}
),
),
),
new Divider(
color: Colors.grey[700],
height: 0.0,
),
],
);
},
),
),
这是我在 _onEntryRemoved 中得到的- 它返回正确的删除，但删除列表不适用于我。
E/flutter (15214): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter (15214): setState() called after dispose(): _join_clubState#a99f1(lifecycle state: defunct, not mounted)
E/flutter (15214): This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g., whose parent widget no longer includes the widget in its build). This error can occur when code calls setState() from a timer or an animation callback. The preferred solution is to cancel the timer or stop listening to the animation in the dispose() callback. Another solution is to check the "mounted" property of this object before calling setState() to ensure the object is still in the tree.
E/flutter (15214): This error might indicate a memory leak if setState() is being called because another object is retaining a reference to this State object after it has been removed from the tree. To avoid memory leaks, consider breaking the reference to this object during dispose().
E/flutter (15214): #0 State.setState.<anonymous closure> (package:flutter/src/widgets/framework.dart:1098:9)
E/flutter (15214): #1 State.setState (package:flutter/src/widgets/framework.dart:1124:6)
E/flutter (15214): #2 _join_clubState._onEntryRemoved (package:proclubscommunity/Club-Player.dart:807:5)
E/flutter (15214): #3 _RootZone.runUnaryGuarded (dart:async/zone.dart:1316:10)
E/flutter (15214): #4 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:330:11)
E/flutter (15214): #5 _DelayedData.perform (dart:async/stream_impl.dart:578:14)
E/flutter (15214): #6 _StreamImplEvents.handleNext (dart:async/stream_impl.dart:694:11)
E/flutter (15214): #7 _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:654:7)
E/flutter (15214): #8 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
E/flutter (15214): #9 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
I/flutter (15214): {club_logo: url_image, club_note: , club_since: , club_three_position: , club_market: false, club_market_color: , club_six_position: , club_premium: false, club_twitter: https://www.twitter.com/, club_first_position: , club_category: 0, club_seven_position: , club_description: , club_copa: 0, club_country: ESPAÑA, club_liga: 0, club_four_position: , club_logo_file_name: club_logo.png, club_plataform: PS4, club_nine_position: , club_captain: RaiiLKilleR, club_name: Barcelona, club_five_position: , club_eight_position: , club_id: 1, club_second_position: , club_logo_folder_name: PS4_Barcelona, club_twitch: https://www.twitch.tv/, club_youtube: https://www.youtube.com/}
将密钥添加到小部件：
return new Column(
key: new ObjectKey(items[index].club_name),
children: <Widget>[
new Container(
decoration: new BoxDecoration(
color: Colors.grey[300],
),
child: new ListTile(
leading: new CachedNetworkImage(imageUrl: items[index].club_logo, width: 60.0),
title: new Text(items[index].club_name, style: new TextStyle(color: Colors.black)),
subtitle: new Text("Captain: "+items[index].club_captain, style: new TextStyle(color: Colors.black)),
trailing: new RaisedButton(
color: Colors.lightBlue[500],
child: new Text("JOIN", style: new TextStyle(color: Colors.white)),
onPressed: (){
}
),
),
),
new Divider(
color: Colors.grey[700],
height: 0.0,
),
],
);
_onEntryRemoved()
_onEntryRemoved(Event event) {
setState(() {
print(event.snapshot.value['club_name']);
items.remove(event.snapshot.value['club_name']);
});
}
