AssetImage constructor
Creates an object that fetches an image from an asset bundle.
The assetName
argument must not be null. It should name the main asset
from the set of images to choose from. The package
argument must be
non-null when fetching an asset that is included in package. See the
documentation for the AssetImage class itself for details.
Implementation
const AssetImage(this.assetName, {
this.bundle,
this.package,
}) : assert(assetName != null);