flutter - 在 flutter 中为 slider 使用离线图像

Question

晚上好

我已经使用了这个 slider 图像示例，它工作正常，但我没有什么问题，我想在这个代码上使用我的本地镜像，但是当项目运行时，它向我显示蓝色矩形，我如何使用我的本地镜像这个 slider ？
谢谢你
这是代码:

    class CarouselDemo extends StatefulWidget {
    CarouselDemo() : super();

     final String title = "Carousel Demo";

     @override
    CarouselDemoState createState() => CarouselDemoState();
    }

    class CarouselDemoState extends State<CarouselDemo> {

    CarouselSlider carouselSlider;
    int _current = 0;
     List imgList = [
    new AssetImage('images/main-slider/1.jpg'),
    new AssetImage('images/main-slider/2.jpg'),
    new AssetImage('images/main-slider/3.jpg'),
    new AssetImage('images/main-slider/4.jpg'),
    ];


     @override
     Widget build(BuildContext context) {
       return Scaffold(
      body: Container(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            carouselSlider = CarouselSlider(
              height: 400.0,
              initialPage: 0,
                                onPageChanged: (index) {
                setState(() {
                  _current = index;
                });
              },
              items: imgList.map((imgUrl) {
                return Builder(
                  builder: (BuildContext context) {
                    return Container(
                      width: MediaQuery.of(context).size.width,
                      margin: EdgeInsets.symmetric(horizontal: 10.0),
                      decoration: BoxDecoration(
                        color: Colors.green,
                      ),
                      child: Image.network(
                        imgUrl,
                        fit: BoxFit.fill,
                      ),
                    );
                  },
                );
              }).toList(),
            ),
        ),
      ),
    );
  }

Answer 1

问题是 imgList是 List<AssetImage>但是您正在尝试使用 Image.network 显示图像。

Image.network creates a widget that displays an [ImageStream] obtained from the network.

你需要的是创建一个 List<Sring>其中字符串将是相对于 pubspec.yaml 的路径文件。也不要使用 Image.Network 你应该使用 Image.assest 因为你想创建一个显示从 Assets 包获得的 [ImageStream] 的小部件。

class CarouselDemo extends StatefulWidget {
  CarouselDemo() : super();

  final String title = "Carousel Demo";

  @override
  CarouselDemoState createState() => CarouselDemoState();
}

class CarouselDemoState extends State<CarouselDemo> {
  CarouselSlider carouselSlider;
  int _current = 0;
  List imgList = [
    'images/main-slider/1.jpg',
    'images/main-slider/2.jpg',
    'images/main-slider/3.jpg',
    'images/main-slider/4.jpg'
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            carouselSlider = CarouselSlider(
              height: 400.0,
              initialPage: 0,
              onPageChanged: (index) {
                setState(() {
                  _current = index;
                });
              },
              items: imgList.map((imgUrl) {
                return Builder(
                  builder: (BuildContext context) {
                    return Container(
                      width: MediaQuery.of(context).size.width,
                      margin: EdgeInsets.symmetric(horizontal: 10.0),
                      decoration: BoxDecoration(
                        color: Colors.green,
                      ),
                      child: Image.asset(
                        imgUrl,
                        fit: BoxFit.fill,
                      ),
                    );
                  },
                );
              }).toList(),
            ),
          ],
        ),
      ),
    );
  }
}