查找设备的航向答案

【问题标题】：Find heading for a device查找设备的航向
【发布时间】：2014-06-25 04:36:40
【问题描述】：

我需要找到垂直放置的 Android 设备的航向（以北东或西的度数）（如下所示：Heading）。我访问了从地磁传感器返回的 sensor.event[2] 值，发现当我完全围绕垂直轴旋转设备时，它们从 1 到 35 不等。如何将此值转换为标题？非常简短的解释或链接将不胜感激。

【问题讨论】：

标签： android android-sensors magnetometer

【解决方案1】：

查看 SensorManager.getOrientation 它返回 3 个角度，围绕 3 个轴。

Computes the device's orientation based on the rotation matrix.

When it returns, the array values is filled with the result:

    values[0]: azimuth, rotation around the Z axis.
    values[1]: pitch, rotation around the X axis.
    values[2]: roll, rotation around the Y axis.

The reference coordinate-system used is different from the world coordinate-system defined for the rotation matrix:

    X is defined as the vector product Y.Z (It is tangential to the ground at the device's current location and roughly points West).
    Y is tangential to the ground at the device's current location and points towards the magnetic North Pole.
    Z points towards the center of the Earth and is perpendicular to the ground.

您需要使用地磁和加速度计传感器输入数据以获取旋转矩阵。查看 SensorManager 了解更多信息

【讨论】：