Question

我有一个应用程序，我使用纬度和经度显示最近的事件（地点）距离。用户纬度和经度是可变的，但事件纬度和经度是固定的。但是，我无法得到正确的距离是km。例如，谷歌地图的正确距离为6.7公里，但其显示为8663.90公里。我是android的新手所以无法得到解决方案。任何帮助都会很棒!!我的代码是

 {  double doubleInstance = d.getDistance(Lat1, Lon1, d.getLatitude(), d.getLongitude(), "N");
            String dInstance = String.format("%.2f",doubleInstance);
            lblview1.setText(" " + String.valueOf(dInstance) + " Km");  }

和

{  public double getDistance(double lat1, double lon1, double lat2, double lon2, String unit) {

    int Radius = 6371;// radius of earth in Km
    double dLat = Math.toRadians(lat2 - lat1);
    double dLon = Math.toRadians(lon2 - lon1);
    double a = Math.sin(dLat / 2) * Math.sin(dLat / 2)
            + Math.cos(Math.toRadians(lat1))
            * Math.cos(Math.toRadians(lat2)) * Math.sin(dLon / 2)
            * Math.sin(dLon / 2);
    double c = 2 * Math.asin(Math.sqrt(a));
    double valueResult = Radius * c;
    double km = valueResult / 1;
    DecimalFormat newFormat = new DecimalFormat("####");
    int kmInDec = Integer.valueOf(newFormat.format(km));
    double meter = valueResult % 1000;
    int meterInDec = Integer.valueOf(newFormat.format(meter));
    Log.i("Radius Value", "" + valueResult + "   KM  " + kmInDec
            + " Meter   " + meterInDec);

    return Radius * c;
}  }

Answer 1

设置您的活动地点。并使用位置管理器获取您当前的位置。

double latitude=lat;
double longitude=lng;    
float distance=0;
Location crntLocation=new Location("crntlocation");
crntLocation.setLatitude(currentLatitude);
crntLocation.setLongitude(currentLongitude);

Location eventLocation=new Location("eventlocation");
eventLocation.setLatitude(latitude);
eventLocation.setLongitude(longitude);


//float distance = crntLocation.distanceTo(eventLocation);  in meters
distance =crntLocation.distanceTo(eventLocation) / 1000; // in kms

Answer 2

使用Location类方法获取两个坐标之间的距离，如;

Location.distanceBetween(obj.getLatitude(), obj.getLongitude(),
                                        mapCircle.getCenter().latitude, mapCircle.getCenter().longitude, distance);

使用纬度和经度android无法正确显示距离

2 个答案: