Created
November 29, 2020 12:55
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use of state mixin in getx
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import 'package:flutter/material.dart'; | |
import 'package:get/get.dart'; | |
import 'package:dio/dio.dart'; | |
void main() { | |
runApp(GetMaterialApp( | |
initialRoute: '/home', | |
getPages: [ | |
GetPage( | |
name: '/home', | |
page: () => HomePage(), | |
), | |
GetPage( | |
name: '/city', | |
page: () => CityPage(), | |
binding: CityBinding(), | |
), | |
], | |
)); | |
} | |
class HomePage extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
appBar: AppBar(title: Text('HOME')), | |
body: Center( | |
child: RaisedButton( | |
onPressed: () => Get.toNamed('/city'), | |
child: Text('Go to Cities'), | |
), | |
), | |
); | |
} | |
} | |
class CityBinding extends Bindings { | |
@override | |
void dependencies() { | |
Get.put(Dio()); | |
Get.put(CityController(dio: Get.find())); | |
} | |
} | |
class CityModel { | |
CityModel({ | |
this.abbreviation, | |
this.name, | |
}); | |
String abbreviation; | |
String name; | |
factory CityModel.fromJson(Map<String, dynamic> json) => CityModel( | |
abbreviation: json["sigla"], | |
name: json["nome"], | |
); | |
static List<CityModel> listFromJson(list) => | |
List<CityModel>.from(list.map((x) => CityModel.fromJson(x))); | |
} | |
class CityController extends GetxController with StateMixin<List<CityModel>> { | |
final Dio dio; | |
CityController({this.dio}); | |
@override | |
void onInit() { | |
findAllCities(); | |
super.onInit(); | |
} | |
findAllCities() { | |
const String url = 'https://servicodados.ibge.gov.br/api/v1/localidades/estados'; | |
dio.get(url).then((result) { | |
List<CityModel> data = CityModel.listFromJson(result.data); | |
change(data, status: RxStatus.success()); | |
}, onError: (err) { | |
change(null, status: RxStatus.error(err.toString())); | |
}); | |
} | |
} | |
class CityPage extends GetView<CityController> { | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
appBar: AppBar(title: Text('Cities')), | |
body: Container( | |
child: controller.obx( | |
(state) => ListView.builder( | |
itemCount: state.length, | |
itemBuilder: (context, index) { | |
return Text(state[index].name); | |
}, | |
), | |
onLoading: Center(child: CircularProgressIndicator()), // optional | |
onError: (error) => Center( // optional | |
child: Text('Error: $error', | |
style: TextStyle(fontSize: 18), | |
textAlign: TextAlign.center, | |
), | |
), | |
), | |
), | |
); | |
} | |
} |
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As at this moment controller.obx is null why is this so?