Map future list flutter

The whole code is pasted below please help.




import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';

void main[]{
runApp[
new MaterialApp[
title: 'app',
home: new Home[],
]
];
}

class Home extends StatefulWidget {
@override
_HomeState createState[] => _HomeState[];
}

class _HomeState extends State {
String _mySelection;
List _myJson = [{"id":0,"name":""},{"id":1,"name":"Test Practice"}];

Future getData[] async{
http.Response response = await http.get['//192.168.0.6/php/mssql_connection/get_username.php'];
print[response.body.toString[]];
return json.decode[response.body];
}

@override
Widget build[BuildContext context] {
return new Scaffold[
body: new Center[
child: new FutureBuilder[
future: getData[],
builder: [context,snapshot]{
if[snapshot.hasError] print[snapshot.error];
if[snapshot.hasData]{
return new DropdownButton[
isDense: true,
hint: new Text["Select"],
value: _mySelection,
onChanged: [String newValue] {

setState[[] {
_mySelection = newValue;
}];

print [_mySelection];
},
items: snapshot.data.map[[Map map] {
return new DropdownMenuItem[
value: map["cunm"].toString[],
child: new Text[
map["cunm"],
],
];
}].toList[],
];
}else{
return new CircularProgressIndicator[];
}
},
],
],
];
}
}