小编Tor*_*dze的帖子

几天前我已经安装了android studio 3.0(预览版),之后在稳定版本(工作室2.3.3)中,当我尝试导入项目时,它给了我一个错误.在预览中一切正常.这是一个错误:

Error:Could not find com.android.tools.build:gradle:3.0.0-alpha4.
Searched in the following locations:
    file:/C:/Program Files/Android/Android Studio/gradle/m2repository/com/android/tools/build/gradle/3.0.0-alpha4/gradle-3.0.0-alpha4.pom
    file:/C:/Program Files/Android/Android Studio/gradle/m2repository/com/android/tools/build/gradle/3.0.0-alpha4/gradle-3.0.0-alpha4.jar
    https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.0-alpha4/gradle-3.0.0-alpha4.pom
    https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.0-alpha4/gradle-3.0.0-alpha4.jar
Required by:
    project :

我有 Material App 和CustomScrollView，BottomNavigationBar在CustomScrollView我有SliverAppBar一个页面Widget（比如说 page1、page2 等...），它代表BottomNavigationBar's当前索引，每个页面上Widget都有SliverList一些内容

我尝试将 Keys 和ScrollControllers放入内部CustomScrollView，但在页面之间导航时滚动位置为初始位置时，它无法按我的预期工作。

class WrapperPage extends StatefulWidget {
  @override
  _WrapperPage createState() => _WrapperPage();
}

class _WrapperPage extends State<WrapperPage> {
  int _curIndex = 0;
  List<Widget> _pages;
  List<PageStorageKey> _keys;
  List<ScrollController> _ctrls;

  @override
  void initState() {
    _pages = [
      // some pages pages
    ];

    _keys = List();
    _ctrls = List();
    for (int i = 0; i < …

您好，我正在尝试在flutter应用程序中添加BottomNavigationBar，但是当我运行项目时发生错误：

A MaterialLocalizations delegate that supports the ka_GE locale was not found

这是我的应用程序代表：

  supportedLocales: [
    const Locale('en', 'US'),
    const Locale('ka', 'GE'),
    const Locale('ru', 'RU'),
  ],
  localizationsDelegates: [
    const InfosLocalizationsDelegate(),
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate
  ],
  locale: Locale('ka')

这是Custom LocalizationsDelegate：

class CLocalizationsDelegate
    extends LocalizationsDelegate<CLocalizations> {
  const CLocalizationsDelegate();

  @override
  bool isSupported(Locale locale) =>
      ['en', 'ka', 'ru'].contains(locale.languageCode);

  @override
  Future<CLocalizations> load(Locale locale) async {
    CLocalizations localizations = new CLocalizations(locale);
    await localizations.load();
    print("Load ${locale.languageCode}");
    return localizations;
  }

  @override
  bool shouldReload(CLocalizationsDelegate old) => false;
}

是的，我知道问题是“ ka”，因为MaterialLocalizations不支持该问题，但我必须解决该问题，所以你们可以帮我吗？

我正在尝试创建一个抽象数据模型，在该模型中我传递数据并键入a，然后是返回列表，但是当我无法调用T.fromJson()方法时，请注意传递类型具有方法fromJson()

class DataList<T> {
  final bool success; 
  dynamic data;


  InfosResponse({
    this.success,
    List<dynamic> data,   
  }) {
    castDataToList(data);
  }

  factory DataList.fromJson(Map<String, dynamic> json) {
    return DataList(
      success: json['success'],
      data: json['data'],
    );
  }

  void castDataToList(jsonData) {
    this.data = List<T>.from(jsonData.map((x) => T.fromJson(x)));
  }
}