flutter 文本字段 "Changing the content within the the composing region may cause the input"

Question

我创建了一个新的 Flutter 应用程序，并尝试使用我之前在多个应用程序中使用过的流程在 TextField 小部件中设置初始值。每当我在字段中编辑内容时，Android Studio 运行窗口都会显示:

W/TextInputPlugin(18696): Changing the content within the the composing region may cause the input method to behave strangely, and is therefore discouraged. See https://github.com/flutter/flutter/issues/78827 for more details
W/IInputConnectionWrapper(18696): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper(18696): getSelectedText on inactive InputConnection
W/IInputConnectionWrapper(18696): getTextAfterCursor on inactive InputConnection
W/IInputConnectionWrapper(18696): beginBatchEdit on inactive InputConnection
W/IInputConnectionWrapper(18696): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper(18696): endBatchEdit on inactive InputConnection

当我查看引用的链接时，我没有看到任何描述解决方案的内容。

为了测试这个，我制作了一个新的、干净的应用程序，只有一个 Text 小部件和 TextEdit 小部件，但我仍然遇到同样的问题。除了设置默认值外，我什么也没做。最终我想捕获对输入字段的更改并将值写入本地存储，但我想我会先修复这个输入错误。

这是我的测试应用程序的代码:

import 'package:flutter/material.dart';

const appName = 'TextField Test';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: appName,
      debugShowCheckedModeBanner: false,
      theme: ThemeData.light(),
      darkTheme: ThemeData.dark(),
      home: HomePage(title: appName),
    );
  }
}

class HomePage extends StatefulWidget {
  HomePage({Key? key, required this.title}) : super(key: key);
  final String title;

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

class _HomePageState extends State<HomePage> {
  late TextEditingController textEditingController;
  String _inputValue = '';

  @override
  void initState() {
    super.initState();
    textEditingController = TextEditingController(text: _inputValue);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Padding(
          padding: const EdgeInsets.all(10.0),
          child:
              Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
            Text('This is some content in a Text widget'),
            SizedBox(height: 10),
            TextField(
              autofocus: true,
              decoration: InputDecoration(
                  border: OutlineInputBorder(),
                  hintText: 'Enter some text here'),
              controller: textEditingController,
            ),
          ]),
        ));
  }
}

有人可以告诉我我做错了什么吗？

当我向 Controller 添加一个监听器时，我注意到它会为我键入的每个字符触发多次:

I/flutter (18696): Listener fired the e
I/flutter (18696): Listener fired the e
I/flutter (18696): Listener fired the en
I/flutter (18696): Listener fired the en

这是监听器代码:

 @override
  void initState() {
    super.initState();
    textEditingController = TextEditingController(text: _inputValue);
    textEditingController.addListener(() {
      print('Listener fired ${textEditingController.text}');
    });
  }

Answer 1

这只是一个警告。 İ 如果您不使用计算机键盘而感到困扰，请在模拟器上使用虚拟键盘。