Flutter优化组建性能

import'package:flutter/material.dart';
voidmain() {
runApp(MyApp());
}
classMyAppextendsStatelessWidget {
@overrideWidgetbuild(BuildContextcontext) {
returnMaterialApp(
title: 'Flutter Demo',
home: MyHomePage(),
    );
  }
}
classMyHomePageextendsStatelessWidget {
@overrideWidgetbuild(BuildContextcontext) {
returnScaffold(
appBar: AppBar(
title: Text('Flutter Demo'),
      ),
body: ListView.builder(
itemCount: 10000,
itemBuilder: (context, index) {
returnOptimizedWidget(index: index);
        },
      ),
    );
  }
}
classOptimizedWidgetextendsStatelessWidget {
finalintindex;
constOptimizedWidget({Key?key, requiredthis.index}) : super(key: key);
@overridebooloperator==(Objectother) =>identical(this, other) ||otherisOptimizedWidget&&runtimeType==other.runtimeType&&index==other.index;
@overrideintgethashCode=>index.hashCode;
@overrideWidgetbuild(BuildContextcontext) {
returnListTile(
leading: CircleAvatar(child: Text('$index')),
title: Text('Item $index'),
subtitle: Text('This is the subtitle of item $index'),
    );
  }
}