Israel Lira

Por gentileza, preciso de ajuda! estou iniciando aqui na comunidade e recente no flutter. Tenho uma missão de utilizar o json e controller dos inputs. Preciso pelo botão (ADD) sair da Primeira tela redirecionar para a Segunda tela, salvar ao colocar os inputs e retornar para a primeira mostrando (nome e valor). O formulário da Segunda Tela terá campos: nome, telefone, data e valor. Quero manter a função dismissible para termos o efeito de arrastar o item da lista. Segue o que estou fazendo mais com erros. Não sei como proceder e apanhando a vários dias! import 'dart:async'; import 'dart:convert'; import 'dart:io'; import 'package:flutter/material.dart'; import 'package:path_provider/path_provider.dart'; void main(){ runApp(MaterialApp( home: Home(), )); } class Home extends StatefulWidget { @override _HomeState createState() => _HomeState(); } class _HomeState extends State<Home> { final _toDoController = TextEditingController(); List _toDoList = [SegundaRota]; Map<String, dynamic> _lastRemoved; int _lastRemovedPos; @override void initState() { super.initState(); _readData().then((data) { setState(() { _toDoList = json.decode(data); }); }); } void _addToDo() { setState(() { Map<String, dynamic> newToDo = Map(); newToDo["title"] = _toDoController.text; _toDoController.text = ""; newToDo["ok"] = false; _toDoList.add(newToDo); _saveData(); }); } Future<Null> _refresh() async{ await Future.delayed(Duration(seconds: 1)); setState(() { _toDoList.sort((a, b){ if(a["ok"] && !b["ok"]) return 1; else if(!a["ok"] && b["ok"]) return -1; else return 0; }); _saveData(); }); return null; } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text("Lista de Tarefas"), backgroundColor: Colors.blueAccent, centerTitle: true, ), body: Column( children: <Widget>[ Container( padding: EdgeInsets.fromLTRB(17.0, 1.0, 7.0, 1.0), child: Row( children: <Widget>[ RaisedButton( color: Colors.blueAccent, child: Text("ADD"), textColor: Colors.white, onPressed: () { Navigator.push( context, MaterialPageRoute(builder: (context) => SegundaRota()), ); }, ) ], ), ), Expanded( child: RefreshIndicator(onRefresh: _refresh, child: ListView.builder( padding: EdgeInsets.only(top: 10.0), itemCount: _toDoList.length, itemBuilder: buildItem),), ) ], ), ); } Widget buildItem(BuildContext context, int index){ return Dismissible( key: Key(DateTime.now().millisecondsSinceEpoch.toString()), background: Container( color: Colors.red, child: Align( alignment: Alignment(-0.9, 0.0), child: Icon(Icons.delete, color: Colors.white,), ), ), direction: DismissDirection.startToEnd, child: CheckboxListTile( title: Text(_toDoList[index]["title"]), value: _toDoList[index]["ok"], secondary: CircleAvatar( child: Icon(_toDoList[index]["ok"] ? Icons.check : Icons.error),), onChanged: (c){ setState(() { _toDoList[index]["ok"] = c; _saveData(); }); }, ), onDismissed: (direction){ setState(() { _lastRemoved = Map.from(_toDoList[index]); _lastRemovedPos = index; _toDoList.removeAt(index); _saveData(); final snack = SnackBar( content: Text("Tarefa \"${_lastRemoved["title"]}\" removida!"), action: SnackBarAction(label: "Desfazer", onPressed: () { setState(() { _toDoList.insert(_lastRemovedPos, _lastRemoved); _saveData(); }); }), duration: Duration(seconds: 2), ); Scaffold.of(context).removeCurrentSnackBar(); Scaffold.of(context).showSnackBar(snack); }); }, ); } Future<File> _getFile() async { final directory = await getApplicationDocumentsDirectory(); return File("${directory.path}/data.json"); } Future<File> _saveData() async { String data = json.encode(_toDoList); final file = await _getFile(); return file.writeAsString(data); } Future<String> _readData() async { try { final file = await _getFile(); return file.readAsString(); } catch (e) { return null; } } } class SegundaRota extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text("Segunda Rota (tela)"), ), body: Column( children: <Widget>[ Container( padding: EdgeInsets.fromLTRB(17.0, 1.0, 7.0, 1.0), child: Row( children: <Widget>[ Expanded( child: TextField( controller: _toDoController, decoration: InputDecoration( labelText: "Nova Tarefa", labelStyle: TextStyle(color: Colors.blueAccent) ), ) ), RaisedButton( color: Colors.blueAccent, child: Text("ADD"), textColor: Colors.white, onPressed: _addToDo, ) ], ), ), Expanded( child: RefreshIndicator(onRefresh: _refresh, child: ListView.builder( padding: EdgeInsets.only(top: 10.0), itemCount: _toDoList.length, itemBuilder: buildItem),), ) ], ), body: Center( child: RaisedButton( onPressed: () { Navigator.pop(context); }, child: Text('Retornar !'), ), ), ); } }