Image.asset(String name, { Key key, AssetBundle bundle, double scale, double width, double height, Color color, ImageFit fit, FractionalOffset alignment, ImageRepeat repeat: ImageRepeat.noRepeat, Rect centerSlice, bool gaplessPlayback: false })

Creates a widget that displays an ImageStream obtained from an asset bundle. The key for the image is given by the name argument.

If the bundle argument is omitted or null, then the DefaultAssetBundle will be used.

If the scale argument is omitted or null, then pixel-density-aware asset resolution will be attempted.

If width and height are both specified, and scale is not, then size-aware asset resolution will be attempted also.

The name and repeat arguments must not be null.

Source 

Image.asset(String name, {
  Key key,
  AssetBundle bundle,
  double scale,
  this.width,
  this.height,
  this.color,
  this.fit,
  this.alignment,
  this.repeat: ImageRepeat.noRepeat,
  this.centerSlice,
  this.gaplessPlayback: false
}) : image = scale != null ? new ExactAssetImage(name, bundle: bundle, scale: scale)
                           : new AssetImage(name, bundle: bundle),
     super(key: key);