function_bug

//just replace the function of addBookFragment's uploadImage with the following function
//the problem was due to the change of the api of firebase database
//hope it will work
private void UploadImage() {
         fileRef=mStorageRef.child(fileName);
        UploadTask uploadTask= fileRef.putFile(selectedImageURI);
        uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                taskSnapshot.getStorage().getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
                    @Override
                    public void onSuccess(Uri uri) {
                        coverLink= uri.toString();
                        Log.e("problem","save to database state");
                        updateTheDatabse();
                    }
                });



            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {

            }
        });
    }