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Summary

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AppBarTheme and BottomAppBarTheme were refactored to conform to Flutter's conventions for component themes. AppBarThemeData and BottomAppBarThemeData were added to define overrides for the defaults of the component visual properties. Releases of Flutter continue to normalize component themes like these for a more consistent theming experience in the material library.

Migration guide

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In ThemeData:

  • The type of the appBarTheme property has been changed from AppBarTheme to AppBarThemeData.
  • The type of bottomAppBarTheme property has been changed from BottomAppBarTheme to BottomAppBarThemeData.

The return type of the component theme xTheme.of() methods and Theme.of().xTheme have also changed to xThemeData.

Code before migration:

dart
final AppBarTheme appBarTheme = Theme.of(context).appBarTheme;
final AppBarTheme appBarTheme = AppBarTheme.of(context);

final BottomAppBarTheme bottomAppBarTheme = Theme.of(context).bottomAppBarTheme;
final BottomAppBarTheme bottomAppBarTheme = BottomAppBarTheme.of(context);
dart
final ThemeData theme = ThemeData(
  appBarTheme: AppBarTheme(),
  bottomAppBarTheme: BottomAppBarTheme(),
);

final ThemeData theme = ThemeData().copyWith(
  appBarTheme: AppBarTheme(),
  bottomAppBarTheme: BottomAppBarTheme(),
);

Code after migration:

dart
final AppBarThemeData appBarTheme = Theme.of(context).appBarTheme;
final AppBarThemeData appBarTheme = AppBarTheme.of(context);

final BottomAppBarThemeData bottomAppBarTheme = Theme.of(context).bottomAppBarTheme;
final BottomAppBarThemeData bottomAppBarTheme = BottomAppBarTheme.of(context);
dart
final ThemeData theme = ThemeData(
  appBarTheme: AppBarThemeData(),
  bottomAppBarTheme: BottomAppBarThemeData(),
);

final ThemeData theme = ThemeData().copyWith(
  appBarTheme: AppBarThemeData(),
  bottomAppBarTheme: BottomAppBarThemeData(),
);

Timeline

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Landed in version: Not yet
Stable release: Not yet

References

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API documentation:

Relevant PRs:

除非另有说明，本文档之所提及适用于 Flutter 的最新稳定版本，本页面最后更新时间: 2025-07-01。 查看文档源码 或者 为本页面内容提出建议.