Firebase Storage - Update file metadata

UpdateFileMetadata.java

private void updateMetaData() {
  Helper.showDialog(this);
  StorageMetadata metadata = new StorageMetadata.Builder().setCustomMetadata("country", "Thailand").build();
  imageRef.updateMetadata(metadata).addOnSuccessListener(new OnSuccessListener<StorageMetadata>() {
    @Override
    public void onSuccess(StorageMetadata storageMetadata) {
      Helper.dismissDialog();
      mTextView.setText(String.format("Country: %s", storageMetadata.getCustomMetadata("country")));
    }
  }).addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception exception) {
      Helper.dismissDialog();
      mTextView.setText(String.format("Failure: %s", exception.getMessage()));
    }
  });
}