rootBundle top-level property Null safety
The AssetBundle from which this application was loaded.
The rootBundle contains the resources that were packaged with the
application when it was built. To add resources to the rootBundle for your
application, add them to the assets subsection of the flutter section of
your application's pubspec.yaml manifest.
For example:
name: my_awesome_application
flutter:
assets:
- images/hamilton.jpeg
- images/lafayette.jpeg
Rather than using rootBundle directly, consider obtaining the AssetBundle for the current BuildContext using DefaultAssetBundle.of. This layer of indirection lets ancestor widgets substitute a different AssetBundle at runtime (e.g., for testing or localization) rather than directly replying upon the rootBundle created at build time. For convenience, the WidgetsApp or MaterialApp widget at the top of the widget hierarchy configures the DefaultAssetBundle to be the rootBundle.
See also:
Implementation
final AssetBundle rootBundle = _initRootBundle();