在有人輸入某些內容后，我一直在嘗試輸出AlertDialog，但是alertdialog不起作用

我想獲得用戶在文本欄位中輸入的任何內容的輸出，我參考了flutter dev的官方檔案。我無法提出我錯的地方，如果你們能提供幫助，我會很高興。我希望使用控制器將文本欄位輸入作為輸出，但 alertdialog 不起作用。

這是我的代碼：

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final myController = TextEditingController();

  @override
  void dispose() {
    // Clean up the controller when the widget is disposed.
    myController.dispose();
    super.dispose();
  }
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
          appBar: AppBar(title: const Text('Employee List')),
          body: Column(
            children: [
              Padding(
                padding: const EdgeInsets.all(16.0),
                child: TextField(
                  controller: myController,
                  decoration: const InputDecoration(
                    border: OutlineInputBorder(),
                    hintText: 'Enter Employee Name',
                  ),
                ),
              ),
              ElevatedButton(
                // When the user presses the button, show an alert dialog containing
                // the text that the user has entered into the text field.
                onPressed: () {
                  showDialog(
                    context: context,
                    builder: (context) {
                      return AlertDialog(
                        // Retrieve the text that the user has entered by using the
                        // TextEditingController.
                        content: Text(myController.text),
                      );
                    },
                  );
                },
                child: const Icon(Icons.text_fields),
              ),
            ],
          )),
    );
  }
}

uj5u.com熱心網友回復：

您可以創建另一個小部件（新的）或移動MaterialApp到頂層。

void main() {
  runApp(
    const MaterialApp(
      debugShowCheckedModeBanner: false,
      home: MyApp(),
    ),
  );
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final myController = TextEditingController();

  @override
  void dispose() {
    // Clean up the controller when the widget is disposed.
    myController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Employee List')),
      body: Column(
        children: [
          Padding(
            padding: const EdgeInsets.all(16.0),
            child: TextField(
              controller: myController,
              decoration: const InputDecoration(
                border: OutlineInputBorder(),
                hintText: 'Enter Employee Name',
              ),
            ),
          ),
          ElevatedButton(
            // When the user presses the button, show an alert dialog containing
            // the text that the user has entered into the text field.
            onPressed: () {
              showDialog(
                context: context,
                builder: (context) {
                  return AlertDialog(
                    // Retrieve the text that the user has entered by using the
                    // TextEditingController.
                    content: Text(myController.text),
                  );
                },
              );
            },
            child: const Icon(Icons.text_fields),
          ),
        ],
      ),
    );
  }
}

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