def METHOD_NAME(self):
    super(CameraAndroid, self).METHOD_NAME()
    if self._update_ev is not None:
        self._update_ev.cancel()
        self._update_ev = None
    self._android_camera.stopPreview()
    self._android_camera.setPreviewCallbackWithBuffer(None)
    # buffer queue cleared as well, to be recreated on next start
    with self._buflock:
        self._buffer = None