问题描述:

First of all I apologise for my poor English.

I currently working on an android-app and I am using the google api v2. I have got 2 Markers on my google map and calculate the distance between them, with the .distancebetween method. Then I draw a Polyline between the markers.

Now i want to bind the distance to my Polyline. The distance should be under the polyline and if i move a marker the distance should still under the polyline.

This method may help you to find the distance, it finds the distance between the starting points LatLng and ends point LatLng

```
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;
}
```

you can also try this :

```
Location locationA = new Location("location A");
locationA.setLatitude(locationA.getLatitudeE6() / 1E6);
locationA.setLongitude(locationA.getLongitudeE6() / 1E6);
Location locationB = new Location("location B");
locationB.setLatitude(locationB.getLatitudeE6() / 1E6);
locationB.setLongitude(locationB.getLongitudeE6() / 1E6);
double distance = locationA.distanceTo(locationB);
```

This is not easy to do, but certainly possible.

Here are the steps:

- calculate center of each line
- for that center latitude, calculate point that is 50dp below it (using
`Projection`

) - put a marker on that position
- set marker icon to
`Bitmap`

with text - update markers position when you get calls to
`OnCameraChangeListener.onCameraChange`

or in`Handler`

's`Runnable`

posted every few milliseconds