firebase - 上传用户个人资料图片 Firebase - Flutter

Question

我正在使用 ImagePicker 选择个人资料图片，一旦选择图片，它将被分配给 Circle Avatar 现在我如何将图片上传到 firebase。如果用户刷新页面 (UI) Circle Avatar 将返回到默认图像!我需要用当前用户的图片替换 Circle Avatar。

只是我不知道如何从 firebase 检索图像并将其分配到 Circle Avatar

这是我尝试更新圆圈头像的方式 -

 CircleAvatar(
                            radius: 30.0,
                            backgroundColor: Colors.white,
                            child: (_imageFile != null)
                                ? Container(
                                    decoration: BoxDecoration(
                                      shape: BoxShape.circle,
                                      image: DecorationImage(
                                          image: FileImage(_imageFile),//Selected Image
                                          fit: BoxFit.fill),
                                    ),
                                  )
                                : Image.network(
                                    (photoUrl == null)
                                        ? 'https://www.materialui.co/materialIcons/image/add_a_photo_black_36x36.png'//Default Picture
                                        : photoUrl,
                                    fit: BoxFit.fill,
                                  ), //Replace with Image From DB

上传图片-

Future UpdatePic() async{
   String fileName = basename(_imageFile.path);
  StorageReference firebaseStorageRef =
      FirebaseStorage.instance.ref().child(fileName);
  StorageUploadTask uploadTask = firebaseStorageRef.putFile(_imageFile);
  StorageTaskSnapshot taskSnapshot = await uploadTask.onComplete;
  showInSnackBar("Picture updated successfully.");
}

这会上传图片，但我不知道如何将其检索到该特定用户个人资料的 Circle Avatar 中。

Answer 1

首先您需要获取您存储的照片的下载地址:

FirebaseStorage.instance
          .ref() //if your photos are inside another folder, lets say avatarPhotos
                 // you need to put that here also to get the download URL, with
                 // another .child('avatarPhotos') 
          .child(fileName)
          .getDownloadURL()
          .then((value) => {
                 //here you can either set your photoUrl to value or assuming
                 //assuming you have a database with users with profile pictures, 
                 //you can call a method to update the user with this value
                 photoUrl = value;
              });
    });

然后您可以将下载 URL 存储在一个变量中，并像您在代码中使用 Image.network(photoUrl) 那样输出它。