如何检索flutter应用程序的当前字体系列名称，默认名称是什么？
我尝试过
Theme.of(context).textTheme.
和
Theme.of(context).
但是字体家族没有属性。
答案 0 :(得分：7)
MaterialApp的默认字体为PORVL2N2，一种Google字体。
答案 1 :(得分：4)
默认字体取决于操作系统：
Android 使用Roboto字体。
iOS 使用San Francisco字体（特别是SF Pro Display）。
答案 2 :(得分：0)
MaterialApp的默认字体在
中描述 /flutter/packages/flutter/lib/src/material/typography.dart
在iOS上，默认的TextTheme是
static const TextTheme whiteCupertino = TextTheme(
display4 : TextStyle(debugLabel: 'whiteCupertino display4', fontFamily: '.SF UI Display', inherit: true, color: Colors.white70, decoration: TextDecoration.none),
display3 : TextStyle(debugLabel: 'whiteCupertino display3', fontFamily: '.SF UI Display', inherit: true, color: Colors.white70, decoration: TextDecoration.none),
display2 : TextStyle(debugLabel: 'whiteCupertino display2', fontFamily: '.SF UI Display', inherit: true, color: Colors.white70, decoration: TextDecoration.none),
display1 : TextStyle(debugLabel: 'whiteCupertino display1', fontFamily: '.SF UI Display', inherit: true, color: Colors.white70, decoration: TextDecoration.none),
headline : TextStyle(debugLabel: 'whiteCupertino headline', fontFamily: '.SF UI Display', inherit: true, color: Colors.white, decoration: TextDecoration.none),
title : TextStyle(debugLabel: 'whiteCupertino title', fontFamily: '.SF UI Display', inherit: true, color: Colors.white, decoration: TextDecoration.none),
subhead : TextStyle(debugLabel: 'whiteCupertino subhead', fontFamily: '.SF UI Text', inherit: true, color: Colors.white, decoration: TextDecoration.none),
body2 : TextStyle(debugLabel: 'whiteCupertino body2', fontFamily: '.SF UI Text', inherit: true, color: Colors.white, decoration: TextDecoration.none),
body1 : TextStyle(debugLabel: 'whiteCupertino body1', fontFamily: '.SF UI Text', inherit: true, color: Colors.white, decoration: TextDecoration.none),
caption : TextStyle(debugLabel: 'whiteCupertino caption', fontFamily: '.SF UI Text', inherit: true, color: Colors.white70, decoration: TextDecoration.none),
button : TextStyle(debugLabel: 'whiteCupertino button', fontFamily: '.SF UI Text', inherit: true, color: Colors.white, decoration: TextDecoration.none),
subtitle : TextStyle(debugLabel: 'whiteCupertino subtitle', fontFamily: '.SF UI Text', inherit: true, color: Colors.white, decoration: TextDecoration.none),
overline : TextStyle(debugLabel: 'whiteCupertino overline', fontFamily: '.SF UI Text', inherit: true, color: Colors.white, decoration: TextDecoration.none),
);
在Android上，默认的TextTheme是
static const TextTheme whiteMountainView = TextTheme(
display4 : TextStyle(debugLabel: 'whiteMountainView display4', fontFamily: 'Roboto', inherit: true, color: Colors.white70, decoration: TextDecoration.none),
display3 : TextStyle(debugLabel: 'whiteMountainView display3', fontFamily: 'Roboto', inherit: true, color: Colors.white70, decoration: TextDecoration.none),
display2 : TextStyle(debugLabel: 'whiteMountainView display2', fontFamily: 'Roboto', inherit: true, color: Colors.white70, decoration: TextDecoration.none),
display1 : TextStyle(debugLabel: 'whiteMountainView display1', fontFamily: 'Roboto', inherit: true, color: Colors.white70, decoration: TextDecoration.none),
headline : TextStyle(debugLabel: 'whiteMountainView headline', fontFamily: 'Roboto', inherit: true, color: Colors.white, decoration: TextDecoration.none),
title : TextStyle(debugLabel: 'whiteMountainView title', fontFamily: 'Roboto', inherit: true, color: Colors.white, decoration: TextDecoration.none),
subhead : TextStyle(debugLabel: 'whiteMountainView subhead', fontFamily: 'Roboto', inherit: true, color: Colors.white, decoration: TextDecoration.none),
body2 : TextStyle(debugLabel: 'whiteMountainView body2', fontFamily: 'Roboto', inherit: true, color: Colors.white, decoration: TextDecoration.none),
body1 : TextStyle(debugLabel: 'whiteMountainView body1', fontFamily: 'Roboto', inherit: true, color: Colors.white, decoration: TextDecoration.none),
caption : TextStyle(debugLabel: 'whiteMountainView caption', fontFamily: 'Roboto', inherit: true, color: Colors.white70, decoration: TextDecoration.none),
button : TextStyle(debugLabel: 'whiteMountainView button', fontFamily: 'Roboto', inherit: true, color: Colors.white, decoration: TextDecoration.none),
subtitle : TextStyle(debugLabel: 'whiteMountainView subtitle', fontFamily: 'Roboto', inherit: true, color: Colors.white, decoration: TextDecoration.none),
overline : TextStyle(debugLabel: 'whiteMountainView overline', fontFamily: 'Roboto', inherit: true, color: Colors.white, decoration: TextDecoration.none),
);
您可以通过以下代码检索字体系列
DefaultTextStyle.of(context).style.fontFamily
答案 3 :(得分：0)
在Flutter中，Android上的默认字体为Roboto。
但是我使用android Monitor运行我的Flutter应用程序。我发现默认字体为monospace。谁能告诉我，怎么了？
代码如下：
import 'package:flutter/material.dart';
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(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
// primarySwatch: Colors.yellow,
primaryColor: Colors.teal,
// default font-family is 'monospace',
fontFamily: DefaultTextStyle.of(context).style.fontFamily,
// replace with 'Roboto',but the result is 'monospace'
// fontFamily: 'Roboto',
// use 'monospaced',the result is 'monospace'
// fontFamily: 'monospaced',
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
counter++;
print('defalut font is： ${DefaultTextStyle.of(context).style.fontFamily}');
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(
widget.title,
),
),
body: Text('$counter'),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
); // This trailing comma makes auto-formatting nicer for build methods.
}
}
答案 4 :(得分：0)
Flutter 应用项目的默认字体系列是
Roboto - 从这里获取：https://fonts.google.com/specimen/Roboto#standard-styles
默认显示在 Andriod OS 上。
对于 iOS 设备
旧金山字体 - 在此处获取：https://developer.apple.com/fonts/
要在您的 flutter 项目中默认使用其中任何一个（也取决于您的主题设置），您可以导入其中一个或两者：
对于 Andriod - import package:flutter/material.dart。
对于 iOS - import package:flutter/cupertino.dart。
您也可以使用其他字体（将其文件夹添加到根文件夹或创建资产文件夹）并将字体定义包含在 pubspec.yaml 中