Flutter之Map的使用_flutter 怎么退出map循环

import 'package:flutter/material.dart';

void main () {

var myApp = MyApp(aMap: {0: Colors.green,1: Colors.lightBlue,2:Colors.pink,3:Colors.purple},);

return runApp(myApp);

}

class MyApp extends StatelessWidget{

final Map<int,Color> aMap ;

MyApp({Key key, @required this.aMap }):super(key:key);

@override

Widget build(BuildContext content){

return MaterialApp(

title: 'Map',

home: Scaffold(

body:ListView.builder(

itemCount: aMap.length,

itemBuilder: (context,index){

return new ListTile(

title:new Text('${aMap.keys}',style:TextStyle(color:aMap[Key]),),

);

}

),

),

);

}

 

}