java - Get nearest point from ArrayList<LatLng> -

i'm working on app has google map , polyline specify route. want when user opens map automatically put marker on nearest point between user , polyline.

i've set function gets nearest point user polyline. if distance < 600 puts marker in point. want take coordinates(of polyline) < 600 meters user , choose closest one... code

polyline arraylist:

 public arraylist<latlng> polylinelist(){      arraylist<latlng> coords = new arraylist<latlng>();      coords.add(new latlng(25.71687391423798,-100.3730825815284));     coords.add(new latlng(25.71682182829175,-100.3733097782636));     coords.add(new latlng(25.71678126641878,  -100.374090669652));     coords.add(new latlng(25.71683201122758, -100.3731781269444));     coords.add(new latlng(25.72018196813817, -100.3735084186905));     coords.add(new latlng(25.72031604576068,  -100.3736959395207));     coords.add(new latlng(25.71998332400039,   -100.3762802484946));     coords.add(new latlng(25.71994816609866,   -100.3764646004368));     coords.add(new latlng(25.72208094229626,   -100.3773901496331));     coords.add(new latlng(25.72139701948525, -100.3784182403878));     coords.add(new latlng(25.72088085424743, -100.3792655793197));     coords.add(new latlng(25.7211341509678, -100.3796660319109));     coords.add(new latlng(25.72119368137114,  -100.3807655073227));     coords.add(new latlng(25.72102639768713,  -100.3811907891904));     coords.add(new latlng(25.72079498457438,   -100.3810006195533));     coords.add(new latlng(25.720670392499,   -100.3799969462212));     coords.add(new latlng(25.72062014771428, -100.3798718252661));     coords.add(new latlng(25.71970136267208,  -100.3812225396649));     coords.add(new latlng(25.71935874972525,   -100.3814558417726));     coords.add(new latlng(25.71758071083912,    -100.3839700351668));     coords.add(new latlng(25.71722347802044,   -100.3838886540422));     coords.add(new latlng(25.71531766471047,    -100.3815788239292));     coords.add(new latlng(25.71564916096481,    -100.3804237189767));     coords.add(new latlng(25.7159267510913,   -100.3800793191019));     coords.add(new latlng(25.71627234185268,   -100.3795543063391));     coords.add( new latlng(25.71665021282444,    -100.3790150094068)); 

return coords; }

then, user's location , evaluate coordinates every arraylist index using haversine formula, if distace <600 draw marker.

 (int = 0; < polylinelist().size(); i++) {                     double latit = polylinelist.get(i).latitude;                     double longit = polylinelist.get(i).longitude;                     latlng newlatlng = new latlng(latit, longit);                     double distance = distancehaversine(userlatit, latit, userlongit, longit);                     if (distance < 600) {                         drawmarker(newlatlng);                     }                 } 

this working correctly draws lot of markers in coordinates < 600 meters user's location. want draw marker in nearest point of polyline. sort of evaluate coords < 600 user , choose closest. appreciate help.

find minimum distance user available points, latlng associated min distance , draw marker using

private int mindistance = 0;     private latlng closestlatlng = null;      (int = 0; < polylinelist().size(); i++) {                         double latit = polylinelist.get(i).latitude;                         double longit = polylinelist.get(i).longitude;                         latlng newlatlng = new latlng(latit, longit);                         double distance = distancehaversine(userlatit, latit, userlongit, longit);                         if (distance < mindistance) {                             closestlatlng = newlatlng;                             mindistance = distance;                         }                     }     if(closestlatlng !=null && mindistance < 600){         drawmarker(closestlatlng);     }