CompassFragment.java 文件源码

public static float getDeclination(Location location, long timestamp) {
    if (location == null)
        return 0;

    GeomagneticField field = new GeomagneticField((float) location.getLatitude(), (float) location.getLongitude(),
            (float) location.getAltitude(), timestamp);

    return field.getDeclination();
}