OrientationManager.java 文件源码

/**
 * Updates the cached instance of the geomagnetic field after a location change.
 */
private void updateGeomagneticField() {
    mGeomagneticField = new GeomagneticField((float) mLocation.getLatitude(),
            (float) mLocation.getLongitude(), (float) mLocation.getAltitude(),
            mLocation.getTime());
}