Saving Data on Android

CloudStorageManager.kt
 and replace 
uploadPhoto()
 with the following:
fun uploadPhoto(selectedImageUri: 
Uri
, onSuccessAction: (
String
) 
-> 
Unit
) { 
  
// 1
 
  val photosReference = 
firebaseStorage.getReference(
PHOTOS_REFERENCE
) 
 
  
// 2
 
  selectedImageUri.lastPathSegment?.
let
 { segment -> 
    
// 3
 
    val photoReference = photosReference.child(segment) 
 
    
// 4
 
    photoReference.putFile(selectedImageUri) 
        
// 5
 
        .continueWithTask(
Continuation
<
UploadTask
.
TaskSnapshot
, 
Task
<
Uri
>> { task -> 
          val exception = task.exception 
            
// 6
 
          
if
 (!task.isSuccessful && exception != null) { 
            
throw
 exception 
          } 
          
return
@
Continuation
 photoReference.downloadUrl 
        }) 
        
// 7
 
        .addOnCompleteListener { task -> 
            
// 8
 
          
if
 (task.isSuccessful) { 
            val downloadUri = task.result 
            onSuccessAction(downloadUri.
toString
()) 
          } 
        } 
  } 
}
1. First, you get a reference to the 
photos
 folder that you created earlier, by calling 
getReference
 on 
firebaseStorage
. This is where you'll upload your photo.
2. You'll use 
lastPathSegment
 of the image URI as the name of the file that you're 
going to save.
3. Get a reference that points to the location to which you'll store the image.
4. To store the image to the reference, call 
putFile()
 on it and pass in the content 
URI of the image. This method stores the image asynchronously and returns an 
instance of 
UploadTask
 that you'll use to track the upload progress.
Saving Data on Android
Chapter 20: Cloud Storage
raywenderlich.com
285

---

5. Next, call 
continueWithTask()
 on 
UploadTask
 to get the download URL of the 
image you're uploading when the image upload finishes.
6. If the 
Task
 is successful, you return 
photoReference.downloadUrl
 which 
returns the 
Task
. Otherwise, you throw an exception.
7. Finally, attach an 
OnCompleteListener
 so you'll receive a notification when the 
upload finishes.
8. If the task is successful, you get the download URL by calling 
task.result
. You 
pass that result to 
onSuccessAction()
.
Now, open