您可以随时随地在自己的各种设备上畅享数百万最新的 Android 应用、游戏、音乐、电影、电视节目、图书、杂志等精彩内容。
This will measure the speed and distance of an elevator using your devices accelerometer
Place the device against the elevator wall on a flat surface (e.g. the floor), follow the on screen instructions.
Don't worry if you don't hold it exactly straight, it will allow for that, but the device must be held VERY still and must not be moved after calibration, or the speed shown will be incorrect.