chooseVariant method
Return the best choice of resolution variants for current device pixel ratio in the String type. Example: "1.5x"
Implementation
String chooseVariant(BuildContext context) {
var currentRatio = MediaQuery.of(context).devicePixelRatio;
String bestVariant =
_AssetVariantChooser._findBestVariant(_candidates, currentRatio) ??
_defaultRatioName;
return bestVariant;
}