在 flutter 中使用离线图像作为滑块

Question

晚上好

我已经使用了这个滑块图像示例并且它工作正常但我没有什么问题，我想在此代码上使用我的本地图像但是当项目已经运行时，它显示蓝色矩形，如何在此滑块上使用我的本地图像？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>，但您正试图显示带有 Image.network 的图像。

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

您需要创建一个 List<Sring>，其中字符串将是相对于 pubspec.yaml 文件的路径。也不要使用 Image.Network 你应该使用 Image.assest 因为你想创建一个小部件来显示从资产包中获得的 [ImageStream]。

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(),
            ),
          ],
        ),
      ),
    );
  }
}

在 flutter 中使用离线图像作为滑块

use offline image for slider in flutter

slider

carousel

dart

flutter