code: @Override
    public void showAndChoose(IConsumer<File> consumer) {
      this.consumer = consumer;
      initSrvNodeFile();
      Intent activityTreeIntent = new Intent(activity, ActivityTreeChooser.class);
      activityTreeIntent.putExtra(FragmentNodes.ARG_ID_NODE_SRVNODES, new String[]{idFolderStart, idSrvGetNodeFile, idCommand, title});
      activity.startActivityForResult(activityTreeIntent, REQUEST_NODE_FILE);
    }
docs: You must provide fileFilter, idFolderStart and title to invoke it!