Get package with activity of applications that are running in the foreground.

def view_surface_app_activity(self) -> str:
        '''Get package with activity of applications that are running in the foreground.'''
        output, error = self._execute(
            '-s', self.device_sn, 'shell', 'dumpsys', 'window', 'w')
        return re.findall(r"name=([a-zA-Z0-9\.]+/.[a-zA-Z0-9\.]+)", output)