flutter-sample-text-input-dialog.dart

import 'package:flutter/material.dart';

///////////////////////////////
void main() => runApp(MyApp());

///////////////////////////////
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(theme: ThemeData(), home: MyHomePage());
  }
}

///////////////////////////////
class MyHomePage extends StatefulWidget {
  List<Widget> cards = [];

  MyHomePage({Key? key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  
  String? label = "";
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("My TODO"),
      ),
      body: Center(
        child: Text(label ?? "")
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () async {
          var resultLabel = await _showTextInputDialog(context);
          if (resultLabel != null) {
            setState((){
              label = resultLabel;
            });
          }
        },
        child: const Icon(Icons.add),
      ),
    );
  }

  final _textFieldController = TextEditingController();
 
  Future<String?> _showTextInputDialog(BuildContext context) async {
    return showDialog(
        context: context,
        builder: (context) {
          return AlertDialog(
            title: const Text('TODO'),
            content: TextField(
              controller: _textFieldController,
              decoration: const InputDecoration(hintText: "タスクの名称を入力してください。"),
            ),
            actions: <Widget>[
              ElevatedButton(
                child: const Text("キャンセル"),
                onPressed: () => Navigator.pop(context),
              ),
              ElevatedButton(
                child: const Text('OK'),
                onPressed: () => Navigator.pop(context, _textFieldController.text),
              ),
            ],
          );
        });
  }
}

THANKS SO MUCH

+1, this was very helpful. Wasn't aware of TextEditingController.

これはとても役に立ちました！ どうもありがとう。