Flutter获取URL Firebase存储

Question

嘿，没有人知道如何将url variable传递到另一个Widget build函数，我可以使用这些url在Image.network(url)中显示此函数，如下所示。

 Future uploadPic(BuildContext context)async{
    String fileName=basename(_image.path);
    StorageReference firebaseStorageRef=FirebaseStorage.instance.ref().child(fileName);
    StorageUploadTask uploadTask=firebaseStorageRef.putFile(_image);
    StorageTaskSnapshot taskSnapshot= await uploadTask.onComplete;
    var downUrl = await (await uploadTask.onComplete).ref.getDownloadURL();
    var url = downUrl.toString();

    setState(() {
      print('Profile Picture uploaded');
      Scaffold.of(context).showSnackBar(SnackBar(content: Text('Profile Picture Uploaded')));
    });
   }