@Override
    public void onNewFolder(@NonNull final String name) {
        File folder = new File(mCurrentPath, name);

        if (folder.mkdir()) {
            refresh(folder);
        } else {
            Toast.makeText(getActivity(), github.tornaco.android.thanos.res.R.string.nnf_create_folder_error,
                    Toast.LENGTH_SHORT).show();
        }
    }
Name is validated to be non-null, non-empty and not containing any
slashes.

@param name The name of the folder the user wishes to create.
android/modules/module_filepicker/src/main/java/com/nononsenseapps/filepicker/FilePickerFragment.java