Flutter的核心设计思想便是“一切皆Widget”1、应用入口main函数，runApp功能是启动Flutter应用，它接受一个Widget参数voidmain(){runApp(constMyApp());}2、MyApp继承了StatelessWidget类，可以看出应用本身也是一个widget。widget我的理解是，有点类型安卓的view/vie

import'package:flutter/material.dart';voidmain(){runApp(MyApp());}classMyAppextendsStatelessWidget{@overrideWidgetbuild(BuildContextcontext){returnconstMaterialApp(home:MyHomePage(),);}}classMyH