使用位置管理器计算行动距离的机器人

Question

我目前正在研究一个简单的健身应用程序，允许用户跟踪他/她的表现（跑步，走路）。我一直在使用位置管理器来获得非常好的移动速度。但是我需要获得距离，如何使用位置管理器（长和纬）来获得距离？

感谢

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_track); 

    start = (Button) findViewById(R.id.btnStart); 
    speed = (TextView) findViewById(R.id.txtSpeed); 
    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); 


    //initialize location listener 
    locationListener = new LocationListener() { 
     @Override 
     public void onLocationChanged(Location location) { 
      getSpeed(location); 
      double lat2 = location.getLatitude(); 
      double lng2 = location.getLongitude(); 
     } 

     @Override 
     public void onStatusChanged(String s, int i, Bundle bundle) { 

     } 

     @Override 
     public void onProviderEnabled(String s) { 

     } 

     @Override 
     public void onProviderDisabled(String s) { 
     } 

     //get the speed from the given location updates 
     public void getSpeed(Location location) { 
      currentSpeed = (location.getSpeed() * 3600/1000); 
      String convertedSpeed = String.format("%.2f", currentSpeed); 
      speed.setText(convertedSpeed + "Km/h"); 
     } 
    }; 

Answer 1

您可以找到可能每个连续的纬度和经度之间的距离，并保持增加。

及彼千米（公里），距离

private double distance(double lat1, double lon1, double lat2, double lon2) { 
    double theta = lon1 - lon2; 
    double dist = Math.sin(deg2rad(lat1)) 
        * Math.sin(deg2rad(lat2)) 
        + Math.cos(deg2rad(lat1)) 
        * Math.cos(deg2rad(lat2)) 
        * Math.cos(deg2rad(theta)); 
    dist = Math.acos(dist); 
    dist = rad2deg(dist); 
    dist = dist * 60 * 1.1515; 
    return (dist); 
} 

private double deg2rad(double deg) { 
    return (deg * Math.PI/180.0); 
} 

private double rad2deg(double rad) { 
    return (rad * 180.0/Math.PI); 
} 

希望这有助于你。