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android - Flutter:为什么我收到错误 "Route builders must never return null"？

我是Flutter新手，下面是我的代码homepage.dartimport'package:flutter/material.dart';import'./product_page.dart';classHomepageextendsStatelessWidget{@overrideWidgetbuild(BuildContextcontext){//TODO:implementbuildreturnScaffold(appBar:AppBar(title:Text("ChocoFactory"),),body:HomepageUI(),);}}classHomepageUIexte
ampbuilders34imageUrlproductsMapandroidnullpointerexceptiondartflutter

android - Flutter:为什么我收到错误 "Route builders must never return null"？

我是Flutter新手，下面是我的代码homepage.dartimport'package:flutter/material.dart';import'./product_page.dart';classHomepageextendsStatelessWidget{@overrideWidgetbuild(BuildContextcontext){//TODO:implementbuildreturnScaffold(appBar:AppBar(title:Text("ChocoFactory"),),body:HomepageUI(),);}}classHomepageUIexte
ampbuilders34imageUrlproductsMapandroidnullpointerexceptiondartflutter