Flutter 中的复选框

Question

如何使用复选框实现AppTranslations 小部件？，我想通过单击列表块右侧的框来选择一种语言

我尝试使用CheckBoxListTilie，但没有成功:(

我想要这样的东西：

代码：

class _LanguageSelectorState extends State<LanguageSelector> {
  static final List<String> languagesList = application.supportedLanguages;
  static final List<String> languageCodesList =
      application.supportedLanguagesCodes;


  final Map<dynamic, dynamic> languagesMap = {
    languagesList[0]: languageCodesList[0],
    languagesList[1]: languageCodesList[1],
  };

  @override
  Widget build(BuildContext context) {
    return Scaffold(
          backgroundColor: Colors.white,
          appBar: AppBar(
            backgroundColor: Colors.white,
            iconTheme: IconThemeData(color: Colors.black),
            title: Text(AppTranslations.of(context).text("settings_language"), style: TextStyle(color: Colors.black, letterSpacing: 1)),
            elevation: 0.0,
            centerTitle: true,
            bottom: PreferredSize(child: Container(color: Colors.black, height: 0.1), preferredSize: Size.fromHeight(0.1),),
          ),
      body: _buildLanguagesList(),
    );
  }

  String selectedLanguage = '';

  _buildLanguagesList() {
    return ListView.builder(
      itemCount: languagesList.length,
      itemBuilder: (context, index) {
        return _buildLanguageItem(languagesList[index]);
      },
    );
  }

  _buildLanguageItem(String language) {
    // return ListTile(
    //   onTap: () {
    //     selectedLanguage = language;
    //     application.onLocaleChanged(Locale(languagesMap[language]));
    //   },
    //   title: Text(language),
    //   leading: Icon(Icons.flag),
    // );
    bool _value = false;
    return CheckboxListTile(
      title: Text(language),
      value: _value,
      onChanged: (value) {
        _value = value;
        application.onLocaleChanged(Locale(languagesMap[language]));
      },
      controlAffinity: ListTileControlAffinity.trailing,
    );
  }
}

现在我只有简单的居中列表:(

感谢您的帮助

Answer 1

只需使用CheckboxListTile，这里是一个例子

CheckboxListTile(
        title: Text("This is the label text"),
        value: _value,
        onChanged: (newValue) {...},
        controlAffinity: ListTileControlAffinity.trailing,
      ),

这里是使用 CheckboxListTile 的完整示例：

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

class MyApp extends StatelessWidget {
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Checkbox Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: CheckboxPage(),
    );
  }
}

class CheckboxPage extends StatefulWidget {
  @override
  _CheckboxPageState createState() => _CheckboxPageState();
}

class _CheckboxPageState extends State<CheckboxPage> {
  bool _value = false;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: CheckboxListTile(
          title: Text("This is the label text"),
          value: _value,
          onChanged: (newValue) {
            setState(() {
              _value = newValue;
            });
          },
          controlAffinity: ListTileControlAffinity.trailing,
        ),
      ),
    );
  }
}