Question

直到现在，我已经从我走过的路上每隔5秒插入了我的数据库中的所有纬度和经度集。

现在到达目的地后，我必须计算纬度，经度的距离。这不是关于计算两点之间的行进距离，而是要从我的数据库中得到一组lat的总距离。

我想到了通过获得两点之间的距离来计算总距离的方法并在最后添加

有没有比这更好的解决方案？请提出建议和帮助

已经阅读this SO post但未了解如何使用Google Maps Distance Matrix API获取总距离

/////// service将坐标插入数据库。

private class MyReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context arg0, Intent arg1) {
            String name = arg1.getAction();
            if (name.equalsIgnoreCase("Location_Changed")) {
                db.insertlatlong(new Latilongi(arg1.getStringExtra("latitude"),
                        arg1.getStringExtra("longitude"),currentDateandTime));


                   } else if (arg1.getAction().matches("android.location.PROVIDERS_CHANGED")) {
                Toast.makeText(MapActivity.this, "in android.location.PROVIDERS_CHANGED",
                        Toast.LENGTH_SHORT).show();
            }
        }
    }

Answer 1

您可以使用以下方法为您提供精确的结果

public double CalculationByDistance(LatLng StartP, LatLng EndP) {
        int Radius = 6371;// radius of earth in Km
        double lat1 = StartP.latitude;
        double lat2 = EndP.latitude;
        double lon1 = StartP.longitude;
        double lon2 = EndP.longitude;
        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 2

您只能插入两个坐标之间的距离，最后总结您在数据库中的所有距离。距离达到如下。

float distanceInMeters =  lastLocation.distanceTo(myLocation);

其中＆＃34; lastLocation＆＃34;和＃34; myLocation＆＃34;是位置对象。

如果你没有Location对象，你可以尝试这个。

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

Location myLocation = new Location("");
myLocation.setLatitude(otherlatitude);
myLocation.setLongitude(otherlongitude);

float distanceInMeters =  lastLocation.distanceTo(myLocation);

Answer 3

尝试这个

 private  double distance(double lat1, double lon1, double lat2, double lon2, String unit) {
    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;
    if (unit == "K") {
        dist = dist * 1.609344;
    } else if (unit == "N") {
        dist = dist * 0.8684;
    }

    return (dist);
}

/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
/*::    This function converts decimal degrees to radians                        :*/
/*:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
private static double deg2rad(double deg) {
    return (deg * Math.PI / 180.0);
}

计算Android中的Google Maps API V3的总行进距离

3 个答案: