enum for activity identification
活动的状态码
the device is on a bicycle
设备在自行车上
the device user is walking or running
设备在行走或跑步
the current activity cannot be detected
无法检测当前活动
the user of the device is walking,it is a sub-activity of FOOT
设备的用户正在奔跑，这是FOOT的子活动
the device is still
设备静止
the device has an obvious tilt change
设备有明显的重力变化
the device is in a vehicle, such as a car
设备在车辆中，如汽车
设备的用户正在行走，这是FOOT的子活动
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enum for activity identification
活动的状态码