image - 处理 statusCode : 403 for Image. 网络

Question

能否帮忙解决当图片不存在或图片返回码HTTP请求失败，statusCode: 403

时如何捕获异常

    dynamic _getImage() {
    try {
      return Image.network(
          "https://cdn.dribbble.com/users/1343501/screenshots/4789104/box_800_-601_2.gif",
          height: 96.0,
          width: 96.0,
          fit: BoxFit.cover);
    } catch (e) {
      return Icon(Icons.print);
    }
  }

Answer 1

AFAIK，看起来 Flutter 网络图像方面还没有解决方案，try-catch 闭包在那里没有帮助，因此我想出了一个解决方法来为我处理它，尽管我没有喜欢但找不到更好的解决方案:

  bool imageReady = false;

  @override
  void initState() {
    super.initState();
    checkImageValidity(widget.url);
  }

  checkImageValidity(String url) async {
    var url = Uri.parse(image!);
    http.Response response = await http.get(url);
    try {
      if (response.statusCode == 200) {
        setState(() {
          imageReady = true; // It's valid
        });
      }
    } catch (e) {
      // TODO nothing special to do here
    }
  }

  dynamic _getImage() {
    try {
      return imageReady
          ? Image.network(
              "https://cdn.dribbble.com/users/1343501/screenshots/4789104/box_800_-601_2.gif",
              height: 96.0,
              width: 96.0,
              fit: BoxFit.cover)
          : Icon(Icons.print);
    } catch (e) {
      return Icon(Icons.print);
    }
  }