Classy-Bear

Future<File> getFileFromAsset(String asset) async {
    try {
      var data = await rootBundle.load(asset);
      var bytes = data.buffer.asUint8List();
      var dir = await getApplicationDocumentsDirectory();
      File file = File("${dir.path}/mi_archivo.pdf");
      File assetFile = await file.writeAsBytes(bytes);
      return assetFile;
    } catch (e) {
      throw Exception("Error al abrir el archivo");

Classy-Bear

  @override
  void initState() {
    refreshList();
    super.initState();
  }

Classy-Bear

import 'dart:math';

final random = Random();
final refreshKey = GlobalKey<RefreshIndicatorState>();
var lista = [];

Future<Null> refreshList() async {
    refreshKey.currentState?.show(atTop: false);
    await Future.delayed(Duration(seconds: 1));
    setState(() {

Classy-Bear

@override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Hala para refrescar"),
      ),
      body: RefreshIndicator(
        key: refreshKey,
        child: ListView.builder(
          itemCount: lista.length,

Classy-Bear

  Future<void> _autorizar() async {
    bool isAuthorized = false;
    try {
      isAuthorized = await _autenticacion.authenticateWithBiometrics(
        localizedReason: "Autentíquese para completar su transacción",
        useErrorDialogs: true,
        stickyAuth: true,
      );
    } on PlatformException catch (e) {
      print(e);

Classy-Bear

  Future<void> _listaAutenticacionesDisponibles() async {
    List<BiometricType> listaAutenticacion;
    try {
      listaAutenticacion = await _autenticacion.getAvailableBiometrics();
    } on PlatformException catch (e) {
      print(e);
    }

    if (!mounted) return;

Classy-Bear

 Future<void> _probarAutorizacion() async {
    bool podemosUsarAutorizacion = false;
    try {
      podemosUsarAutorizacion = await _autenticacion.canCheckBiometrics;
    } on PlatformException catch (e) {
      print(e);
    }

    if (!mounted) return;

Classy-Bear

  final LocalAuthentication _autenticacion = LocalAuthentication();
  bool _podemosUsarAutorizacion = false;
  String _autorizado = "No autorizado";
  List<BiometricType> _autorizacionesDisponibles = List<BiometricType>();

Classy-Bear

//https://stackoverflow.com/questions/50360443/parsing-json-that-has-a-nested-array-of-objects-in-dart
genres = (jsonMap['genres'] as List).map((i) => Genre.fromJson(i)).toList()
///JSON Data
//{
//   "adult": false,
//    "backdrop_path": "/wrqUiMXttHE4UBFMhLHlN601MZh.jpg",
//    "belongs_to_collection": null,
//    "budget": 120000000,
//    "genres": [
//        {

Classy-Bear

@override
  void dispose() {
    subscription.cancel();
    super.dispose();
  }