How to assign <List<Data>> to list variable? - dart

Question

How to display one by one data using this DB function?
Future<List<Data>> display() async {
//final Database db = await database;
var db = await db1;
final List<Map<String, dynamic>> maps = await db.query('syncTable');
return List.generate(maps.length, (i) {
return Data(
syn_TableName: maps[i]['syn_TableName'],
syn_ChangeSequence: maps[i]['syn_ChangeSequence'],
);
});
}

Answer 1

You can use the FutureBuilder to consume your display() method. Then inside the FutureBuilder you can use AsyncSnapshot.data to get your List of Dataelements.
In the next step you use can call List.map() to map your Data to widgets. In this example I use the ListTile to display:
snapshot.data.map((data) {
return ListTile(
title: Text(data.syn_TableName),
subtitle: Text(data.syn_ChangeSequence),
);
}).toList(),
Here a minimal working example which you can try out:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: FutureBuilder<List<Data>>(
initialData: [],
future: display(),
builder: (context, snapshot) {
return ListView(
children: snapshot.data.map((data) {
return ListTile(
title: Text(data.syn_TableName),
subtitle: Text(data.syn_ChangeSequence),
);
}).toList(),
);
}),
),
);
}
Future<List<Data>> display() async {
return List.generate(15, (i) {
return Data(
syn_TableName: 'syn_TableName $i',
syn_ChangeSequence: 'syn_ChangeSequence $i',
);
});
}
}
class Data {
final String syn_TableName;
final String syn_ChangeSequence;
Data({this.syn_ChangeSequence, this.syn_TableName});
}