颤动-更改appbar的颜色不起作用

我试图改变AppBar的背景颜色,但它不起作用.

0x673AB7根据下图选择颜色时,AppBar变为灰色而不是紫色.

import "package:flutter/material.dart";

void main() {
  runApp(new ControlleApp());
}

class ControlleApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: "Controlle Financeiro",
      home: new HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        backgroundColor: new Color(0x673AB7),
      ),
    );
  }
}

看起来你的颜色是完全透明的.尝试将颜色更改为0xFF673AB7