task.getResult() is throwing a java.lang.ClassCastException

Question

I am using what is recommended by too many developers in order to retrieve the Uri of an image stored in the firebase storage , this my code :

final StorageReference filereference = storageReference.child(System.currentTimeMillis()
                    +"."+getFileExtension(imageUri));
uploadTask =filereference.putFile(imageUri);
uploadTask.continueWith(new Continuation<UploadTask.TaskSnapshot,Task<Uri>>() {
  @Override
  public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws 
  Exception {
             if(!task.isSuccessful()){
             throw task.getException();
             }
             return filereference.getDownloadUrl();

}

}).addOnCompleteListener(new OnCompleteListener<Uri>() {
 @Override
 public void onComplete(@NonNull Task<Uri> task) {
 if(task.isSuccessful()){
 try{
     Uri downloadUri = task.getResult();
     String mUri =downloadUri.toString();
     }catch (Exception e){
     Log.e("testingerror",e.toString());
     }

it throws me this error : com.example.asus.fireapp E/stayinsh: java.lang.ClassCastException: com.google.android.gms.tasks.zzu cannot be cast to android.net.Uri

Hi Doug, i am confused, i am literally using the google code from documentation : https://firebase.google.com/docs/storage/android/upload-files?authuser=0#get_a_download_url — joghm, Jan 18 '19 at 04:43
Please edit the question to show what line of code the error is happening on. — Doug Stevenson, Jan 18 '19 at 04:59
BTW, the example you linked to is using continueWithTask, not continueWith. — Doug Stevenson, Jan 18 '19 at 05:01
Solved,it was indeed continueWithTask,not continuewith. thanks alot — joghm, Jan 18 '19 at 05:13

score 0 · Answer 1 · edited Aug 19 '19 at 08:22

Your code should work if your using a FirebaseStorage Api of 10.0.1 or less what i mean is implementation 'com.google.firebase:firebase-storage:10.0.1' or less

but if its greater use

StorageReference filepath=user_Image_ref.child(user_id+".jpg");
        filepath.putFile(resulturi).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
                if(task.isSuccessful()) {
                    String getimageurl = task.getResult().getDownloadUrl().toString();

                    databaseReference.child("PHOTO").setValue(getimageurl);


                }else {
                    Toast.makeText(Register_activity.this,"errr",Toast.LENGTH_LONG).show();

                }
                String getimageurl = task.getResult().getDownloadUrl().toString();

                databaseReference.child("PHOTO").setValue(getimageurl);
            }
        });

score 0 · Answer 2 · answered Oct 15 '19 at 20:33

It should be continueWithTask instead of continueWith

uploadTask.continueWithTask(new Continuation<UploadTask.TaskSnapshot,Task<Uri>>() {
  @Override
  public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws 
  Exception {
             if(!task.isSuccessful()){
             throw task.getException();
             }
             return filereference.getDownloadUrl();

}

task.getResult() is throwing a java.lang.ClassCastException

2 Answers2