java - How to show the distance in kilometer on activity using google map in Android -


i trying distance of nearby event location (from google map) , show on activity. not sure button need use show distance , java code show distance in kilometer on activity?

if know current latlong or targeted location lat long can find distance using following method.

public double finddistance(latlng fromlatlan, latlng tolatlan) {         int earthradious = 6371;// radius of earth in km         double latfrom = fromlatlan.latitude;         double latto = tolatlan.latitude;         double lonfrom = fromlatlan.longitude;         double lonto = tolatlan.longitude;          double difflat = math.toradians(latto - latfrom);         double difflon = math.toradians(lonto - lonfrom);          double avalue = math.sin(difflat / 2) * math.sin(difflat / 2)                 + math.cos(math.toradians(latfrom))                 * math.cos(math.toradians(latto)) * math.sin(difflon / 2)                 * math.sin(difflon / 2);          double c = 2 * math.asin(math.sqrt(avalue));         double results = earthradious * c;          double kms = results / 1;         decimalformat newformat = new decimalformat("####");         int killometer = integer.valueof(newformat.format(kms));          double meter = results % 1000;         int metersdistance = integer.valueof(newformat.format(meter));           log.i("value", "" + results + "   killometer  " + killometer                 + " meter   " + metersdistance);          return earthradious * c;     }

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