Sample Code ( Firebase Object File )

1. The path for each file is stored in the application in advance, so if you click on the 3d model by specifying a path on the firebase for each item, you can run firebaseDownload, and for PNG, save via downloadBytes to convert it to a file.

    public void downloadBytes(){
        FirebaseStorage storage = FirebaseStorage.getInstance(instance_dir);

        StorageReference storageRef = storage.getReference();

        StorageReference pathReference = storageRef.child(filepath_firebase);

        final long ONE_MEGABYTE = 1024 * 1024;
        pathReference.getBytes(ONE_MEGABYTE).addOnSuccessListener(new OnSuccessListener() {
            @Override
            public void onSuccess(byte[] bytes) {
                Bitmap bit = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
                ivPreview.setImageBitmap(bit);

            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception exception) {
                // Handle any errors
            }
        });
    }