Flutter 支持哪些所有字体而无需外部导入？

Question

Text(
    'Sample',
    style: TextStyle(
        fontFamily: '',
    ), // TextStyle
), //Text

我可以在不下载外部字体的情况下为 fontFamily 属性提供哪些值？

Answer 1

看完material/typography.dart你应该能够发现：

对于 Android，默认为MaterialApp

MaterialApp 的默认字体是roboto，一种 Google 字体。

 /// A material design text theme with dark glyphs based on Roboto.
  ///
  /// This [TextTheme] provides color but not geometry (font size, weight, etc).
  static const TextTheme blackMountainView = TextTheme(
    display4   : TextStyle(debugLabel: 'blackMountainView display4',   fontFamily: 'Roboto', inherit: true, color: Colors.black54, decoration: TextDecoration.none),
    display3   : TextStyle(debugLabel: 'blackMountainView display3',   fontFamily: 'Roboto', inherit: true, color: Colors.black54, decoration: TextDecoration.none),
    display2   : TextStyle(debugLabel: 'blackMountainView display2',   fontFamily: 'Roboto', inherit: true, color: Colors.black54, decoration: TextDecoration.none),
    display1   : TextStyle(debugLabel: 'blackMountainView display1',   fontFamily: 'Roboto', inherit: true, color: Colors.black54, decoration: TextDecoration.none),
    headline   : TextStyle(debugLabel: 'blackMountainView headline',   fontFamily: 'Roboto', inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    title      : TextStyle(debugLabel: 'blackMountainView title',      fontFamily: 'Roboto', inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    subhead    : TextStyle(debugLabel: 'blackMountainView subhead',    fontFamily: 'Roboto', inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    body2      : TextStyle(debugLabel: 'blackMountainView body2',      fontFamily: 'Roboto', inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    body1      : TextStyle(debugLabel: 'blackMountainView body1',      fontFamily: 'Roboto', inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    caption    : TextStyle(debugLabel: 'blackMountainView caption',    fontFamily: 'Roboto', inherit: true, color: Colors.black54, decoration: TextDecoration.none),
    button     : TextStyle(debugLabel: 'blackMountainView button',     fontFamily: 'Roboto', inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    subtitle   : TextStyle(debugLabel: 'blackMountainView subtitle',   fontFamily: 'Roboto', inherit: true, color: Colors.black,   decoration: TextDecoration.none),
    overline   : TextStyle(debugLabel: 'blackMountainView overline',   fontFamily: 'Roboto', inherit: true, color: Colors.black,   decoration: TextDecoration.none),
  );

  /// A material design text theme with light glyphs based on Roboto.
  ///
  /// This [TextTheme] provides color but not geometry (font size, weight, etc).
  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),
  );

对于 iOS，如果使用Curpertino它将是.SF UI Display默认的 ios 字体。

 /// A material design text theme with dark glyphs based on San Francisco.
  ///
  /// This [TextTheme] provides color but not geometry (font size, weight, etc).
  static const TextTheme blackCupertino = TextTheme(
    display4   : TextStyle(debugLabel: 'blackCupertino display4',   fontFamily: '.SF UI Display', inherit: true, color: Colors.black54, decoration: TextDecoration.none),
    display3   : TextStyle(debugLabel: 'blackCupertino display3',   fontFamily: '.SF UI Display', inherit: true, color: Colors.black54, decoration: TextDecoration.none),
    display2   : TextStyle(debugLabel: 'blackCupertino display2',   fontFamily: '.SF UI Display', inherit: true, color: Colors.black54, decoration: TextDecoration.none),
    display1   : TextStyle(debugLabel: 'blackCupertino display1',   fontFamily: '.SF UI Display', inherit: true, color: Colors.black54, decoration: TextDecoration.none),
    headline   : TextStyle(debugLabel: 'blackCupertino headline',   fontFamily: '.SF UI Display', inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    title      : TextStyle(debugLabel: 'blackCupertino title',      fontFamily: '.SF UI Display', inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    subhead    : TextStyle(debugLabel: 'blackCupertino subhead',    fontFamily: '.SF UI Text',    inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    body2      : TextStyle(debugLabel: 'blackCupertino body2',      fontFamily: '.SF UI Text',    inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    body1      : TextStyle(debugLabel: 'blackCupertino body1',      fontFamily: '.SF UI Text',    inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    caption    : TextStyle(debugLabel: 'blackCupertino caption',    fontFamily: '.SF UI Text',    inherit: true, color: Colors.black54, decoration: TextDecoration.none),
    button     : TextStyle(debugLabel: 'blackCupertino button',     fontFamily: '.SF UI Text',    inherit: true, color: Colors.black87, decoration: TextDecoration.none),
    subtitle   : TextStyle(debugLabel: 'blackCupertino subtitle',   fontFamily: '.SF UI Text',    inherit: true, color: Colors.black,   decoration: TextDecoration.none),
    overline   : TextStyle(debugLabel: 'blackCupertino overline',   fontFamily: '.SF UI Text',    inherit: true, color: Colors.black,   decoration: TextDecoration.none),
  );

  /// A material design text theme with light glyphs based on San Francisco.
  ///
  /// This [TextTheme] provides color but not geometry (font size, weight, etc).
  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),
  );

因此，您应该能够通过以下代码检索字体系列

DefaultTextStyle.of(context).style.fontFamily

因此，您可以重复使用检索时相同的字体。