bearingTo(Location dest)究竟计算什么?

本文介绍了bearingTo(Location dest)究竟计算什么?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

bearingTo(Location dest)的准确计算内容是什么?谁能解释一下吗?

What does bearingTo(Location dest) exactly calculate? Can anyone please explain this??

谢谢.

 protected void onCreate(Bundle savedInstanceState) {
    DestinationLoc.setLatitude(39.543394);
    DestinationLoc.setLongitude(-119.816010);
    LocationManager lm =(LocationManager)getSystemService(LOCATION_SERVICE);
    String provider = lm.getBestProvider(new Criteria(), true);
    loc=lm.getLastKnownLocation(provider)
    }

    public void onSensorChanged(SensorEvent event) {
    // TODO Auto-generated method stub
      Startloc.setLatitude(loc.getLatitude());
      Startloc.setLongitude(loc.getLongitude());
    if ( Startloc == null ) return;

    float azimuth = event.values[0];
    float baseAzimuth = azimuth;
    mInitialPosition.setText("Initial LatLong: " + Startloc.getLatitude() + " " + Startloc.getLongitude());
    GeomagneticField geoField = new GeomagneticField( Double
            .valueOf( Startloc.getLatitude() ).floatValue(), Double
            .valueOf( Startloc.getLongitude() ).floatValue(),
            Double.valueOf( Startloc.getAltitude() ).floatValue(),
            System.currentTimeMillis() );
    azimuth += geoField.getDeclination(); // converts magnetic north into true north

    //Correct the azimuth
    azimuth = azimuth % 360;

    //This is where we choose to point it
    float direction = azimuth + Startloc.bearingTo( DestinationLoc );
    float direction2 = Startloc.bearingTo(DestinationLoc);

}

direction2 值显示为负.

bearingTo

bearingTo(Location dest)究竟计算什么?

问题描述

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