lib/main.dart:1: Warning: Interpreting this as package URI, ‘package:flutter_app/main.dart‘.
import ‘dart:ui‘ as ui show Paint, Path, Canvas;
解决：
Link: https://www.cnblogs.com/farwish/p/10428661.html
原文：https://www.cnblogs.com/farwish/p/10428661.html