android - How to show direction on map based on calculated angle in degrees -

i have calculated angle between 2 latitude , longitude coordinates below code.it returns angle 3 in radians, , 193 in degrees. want show arrow marker on map based on angle.how display object direction moved,based on angle?

public static double getangle(double lat1, double lon1, double lat2, double lon2)     {         //formulas      //θ =   atan2(  sin(Δlong).cos(lat2),cos(lat1).sin(lat2) − sin(lat1).cos(lat2).cos(Δlong) )     // Δlong = long2 - long1     log.i("angle", "inside getangle");     double latitude1 = math.toradians(lat1);     double longitude1 = math.toradians(lon1);     double latitude2 = math.toradians(lat2);     double longitude2 = math.toradians(lon2);       double dlong = math.toradians(longitude2-longitude1);      double y = math.sin(dlong) * math.cos(latitude2);     double x = math.cos(latitude1)*math.sin(latitude2) - math.sin(latitude1)*math.cos(latitude2)*math.cos(dlong);     double angle= math.atan2(y, x);       if (angle < 0)         angle = math.abs(angle);     else         angle = 2*math.pi - angle;      log.i("angle", string.valueof(angle)+" in radians");      angle=math.todegrees(angle);     log.i("angle", string.valueof(angle)+" in degrees");      return angle; } 

i got angle , rotate arrow image on same angle on map.this makes direction of route.

import android.graphics.bitmap; import android.graphics.bitmapfactory; import android.graphics.matrix;  /* inside loop of latitude longitude values */ float angle=(float)finalbearing(previouslocationlatitude, previouslocationlongitude, currentlocationlatitude, currentlocationlongitude);  bitmap sprite = bitmapfactory.decoderesource(this.getresources(),r.drawable.dir_green_image);  matrix mat = new matrix(); mat.prerotate(angle);///in degree bitmap mbitmap = bitmap.createbitmap(sprite, 0, 0, sprite.getwidth(), sprite.getheight(), mat, true);  mmap.addmarker(new markeroptions().position(new latlng(currentlocationlatitude, currentlocationlongitude)).icon(bitmapdescriptorfactory.frombitmap(mbitmap)).anchor((float)0.5, (float)0.5)); /* inside loop of latitude longitude values */   static public double initialbearing (double lat1, double long1, double lat2, double long2) {     return (_bearing(lat1, long1, lat2, long2) + 360.0) % 360; }  static public double finalbearing(double lat1, double long1, double lat2, double long2) {     return (_bearing(lat2, long2, lat1, long1) + 180.0) % 360; }  static private double _bearing(double lat1, double long1, double lat2, double long2) {     double degtorad = math.pi / 180.0;     double phi1 = lat1 * degtorad;     double phi2 = lat2 * degtorad;     double lam1 = long1 * degtorad;     double lam2 = long2 * degtorad;      return math.atan2(math.sin(lam2-lam1)*math.cos(phi2),         math.cos(phi1)*math.sin(phi2) - math.sin(phi1)*math.cos(phi2)*math.cos(lam2-lam1)     ) * 180/math.pi; }