Flutter 在自动完成中 Select 值后保持键盘焦点

我曾经遇到过这个问题，我用Autocomplete个小工具中的fieldViewBuilder个解决了这个问题，以便在 Select 一个选项后重新获得焦点.我不确定这是不是一个完美的解决方案，但它对我很管用:

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  FocusNode? _focusNode;
  final GlobalKey _key = GlobalKey();
  @override
  Widget build(BuildContext context) {
    return Column(children: [
      ElevatedButton(onPressed: () {}, child: const Text("Button1")),
      Autocomplete<String>(
        onSelected: (value) {
          _focusNode?.requestFocus();
        },
        fieldViewBuilder: (context, controller, focusNode, onFieldSubmitted) {
          _focusNode = focusNode;
          return TextField(
            key: _key,
            controller: controller,
            focusNode: focusNode,
            onSubmitted: (value) => onFieldSubmitted(),             
          );
        },
        optionsBuilder: (TextEditingValue value) {
        return ["ABC", "DEF"];
      }),
      ElevatedButton(onPressed: () {}, child: const Text("Button2"))
    ]);
  }
}