def start_app_timing(self, package, activity):
        """
        Start the application and activity, and measure time

        Args:
            package: package name
            activity: activity name

        Returns:
            app launch time

        """
        assert package, "package name should not be empty"
        return self.adb.start_app_timing(package, activity)

        Start the application and activity, and measure time

        Args:
            package: package name
            activity: activity name

        Returns:
            app launch time

        
airtest/core/android/android.py