@staticmethod
def _current_app(current_app_response):
    """Get the current app from the output of the command :py:const:`androidtv.constants.CMD_CURRENT_APP`.

        Parameters
        ----------
        current_app_response : str, None
            The output from the ADB command :py:const:`androidtv.constants.CMD_CURRENT_APP`

        Returns
        -------
        str, None
            The current app, or ``None`` if it could not be determined

        """
    if (not current_app_response or '=' in current_app_response or '{' in
        current_app_response):
        return None
    return current_app_response
