dart – 在Flutter中预加载本地图像资源

const List<String> _photoData = const [
  "assets/generic-cover.jpg","assets/generic-cover2.jpg","assets/generic-cover3.jpg","assets/generic-cover4.jpg",];

class _MyHomePageState extends State<MyHomePage> {

  int _coverPhoto = 0;

  void _switchCoverPhoto() {
    setState(() {
      _coverPhoto++;
      if (_coverPhoto == _photoData.length) {
         _coverPhoto = 0;
      }
    });
  }

  @override
  Widget build(BuildContext context) {

    return new Scaffold(
      body: new Stack(
        children: <Widget>[
          new Image.asset (
            _photoData[_coverPhoto],fit: ImageFit.cover,height: 600.0,),new Positioned ( // photo toggle button
            child: new IconButton(
              icon: new Icon (Icons.photo),onPressed: _switchCoverPhoto,color: Colors.white,top: 32.0,right: 32.0,]
      )
    );
  }

第一张图片渲染得很好.但是,当我@L_696_5@_switchCoverPhoto()时,在显示“assets / generic-cover2.jpg”之前会有一个简短的白色闪烁.@H_944_10@

这导致了一个简单的问题：是否有一种简单的方法可以将后续图像(或图像)预加载到内存中,以便事先没有闪存？@H_944_10@

See attached GIF for a loose approximation.@H_944_10@