小编Tra*_*is 的帖子

我的应用程序从 Firebase 存储获取图像。如果不存在图像，我希望能够处理该错误。但我似乎无法让它发挥作用。

我尝试过用 try catch 包围。

我试过这个

Future<dynamic> getImage(int index){\n      return FirebaseStorage.instance.ref().child(widget.snap[index].data[\'\xe8\x8b\xb1\xe6\x96\x87\xe5\x93\x81\xe5\x90\x8d\']+".jpg").getDownloadURL().catchError((onError){\n        print(onError);\n      }); \n }\n

和这个

 Future<dynamic> getImage(int index){\n   var imageStream;\n   try {\n       imageStream = FirebaseStorage.instance.ref().child(widget.snap[index].data[\'\xe8\x8b\xb1\xe6\x96\x87\xe5\x93\x81\xe5\x90\x8d\']+".jpg").getDownloadURL();    \n   } catch (e) {\n     print(e);\n   }\n   return imageStream;\n }\n

但我总是遇到未处理的异常错误并且我的应用程序崩溃。

E/StorageException(11819): StorageException has occurred.\nE/StorageException(11819): Object does not exist at location.\nE/StorageException(11819):  Code: -13010 HttpResult: 404\nE/StorageException(11819): StorageException has occurred.\nE/StorageException(11819): Object does not exist at location.\nE/StorageException(11819):  Code: -13010 HttpResult: 404\nE/StorageException(11819): {  "error": {    "code": 404,    "message": "Not …