當 flutter 文本字段中的自動對焦為真時，鍵盤未顯示

Question

當我在 Visual Studio 中重新啟動此代碼時， autofocus工作正常並且鍵盤正在顯示。 當我關閉 visual studio 並在 android 模擬器中重新打開應用程序時，鍵盤未顯示，但自動對焦正在工作（光標正在顯示）。

但它在 android 5 中的工作非常完美。

我的代碼：

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  
  @override
  Widget build(BuildContext context) {
    
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: TextField(
          autofocus: true,
        )
      ),
    );
  }
}

誰能解決這個問題？ 謝謝你。

Answer 1

試試下面的代碼：

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  final FocusNode focusNode = FocusNode();

  @override
  void initState() {
    super.initState();
    focusNode.requestFocus();
  }

  @override
  void dispose() {
    focusNode.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: TextField(
          focusNode: focusNode,
          autofocus: true,
        ),
      ),
    );
  }
}