如何在Flutter中显示来自API请求的对话框变量

Question

我想访问我的API请求中的变量totalpresence，我在其中汇总来自映射的值。然后，我想在对话框内的小部件中显示变量。我该怎么做呢?提前感谢!

我的代码

Future<List<Presence>> getPresencesByAthleteId() async {
try {
final response = await http.get(
Uri.parse();
if (response.statusCode == 200) {
Map map = json.decode(response.body);
List<Presence>? presencesList = [];
map.forEach((key, value) {
presencesList.add(Presence(
date: map.entries.first.key, count: map.entries.first.value));
var values = map.values;
var totalPresences = values.reduce((sum, element) => sum + element); //this I want to display it in a text
});
return presencesList.toList();
}
} catch (e) {
logger.e(e.toString());
}
return getPresencesByAthleteId(depId, teamId, id, context);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: FutureBuilder<List<Athlete>>(
...
secondary: IconButton(
icon: const Icon(Icons.history_outlined,
color: Colors.black, size: 25),
onPressed: () {
if (_athlete[i].currentMonthPresences! > 0) {
showDialog(
context: context,
builder: (BuildContext context) {
return SimpleDialog(
children: [
Column(
FutureBuilder<List<Presence>>(
future: getPresencesByAthleteId(_athlete[i].department!.id, widget._team.teamKey!.teamId, _athlete[i].id, context),                                                                 
builder: (BuildContext context, AsyncSnapshot snapshot) {                                                                                
if (snapshot.hasData) {                                                                         
...
}),
);
} else if (snapshot.hasError) {
logger.e('${snapshot.error}');
}
}),
Container(
child:
Row(
children: [
const Text(''), // HERE I WANT TO DISPLAY totalPresences
)
],
),
),

Answer 1

这比我想象的要简单，我只需要在我的api请求中像这样设置一个setState:

int总= 0;

Future<List<Presence>> getPresencesByAthleteId() async {
try {
final response = await http.get(
Uri.parse();
if (response.statusCode == 200) {
Map map = json.decode(response.body);
List<Presence>? presencesList = [];
map.forEach((key, value) {
presencesList.add(Presence(
date: map.entries.first.key, count: map.entries.first.value));
var values = map.values;
var totalPresences = values.reduce((sum, element) => sum + element); 
setState(() {
totalPresences = total;
});
});
return presencesList.toList();
}
} catch (e) {
logger.e(e.toString());
}
return getPresencesByAthleteId(depId, teamId, id, context);
}

然后在对话框中显示

.
.
const Text($total),