如何在Android上从方位角获取指南针方向

问题描述

我必须显示用户指向Android设备的方向.

I have to display which direction the user is pointing the Android device.

我正在使用Sensor.TYPE_ACCELEROMETER，Sensor.TYPE_MAGNETIC_FIELD来获取方位角，俯仰和横滚.但是我能够弄清楚如何从中获得方向(北，南，东，西...).

I am using Sensor.TYPE_ACCELEROMETER, Sensor.TYPE_MAGNETIC_FIELD to get the azimuth, pitch, roll. But I am to able to figure out how to get directions (North, south, east , west,...) from this.

请帮助

谢谢

推荐答案

要指向北方，您可以计算以度为单位的旋转度:

To point the north you can calculate a rotation in degrees :

float rotation = -azimut * 360 / (2 * 3.14159f);

您可以看到以下使用加速度计和磁场的指南针示例: http://www.codingforandroid.com/2011/01/using-orientation-sensors-simple.html

You can see the following compass example which make uses of accelerometer and magnetic field : http://www.codingforandroid.com/2011/01/using-orientation-sensors-simple.html

Wikipédia上的方位角: http://en.wikipedia.org/wiki/方位角

Azimuth on Wikipédia : http://en.wikipedia.org/wiki/Azimuth

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