android - Dynamically drawing polygons in Google map -

i new android. i've been trying apply field of view current location in google map. image shows fov on google map in ios.

so did similar thing adding 5 triangles different alpha in order make whole fov gradiant.

i have update fov according azimuth of device, remove triangles ,recompute them , add them again.

    for(int i=0; i<5;i++){         if(triangles[i]!=null){             triangles[i].remove();         }     //triangles=null;          la = mvalues[0]-hang/2;         lx = lon+i*math.sin(math.toradians(la))/2775;         ly = lat+i*math.cos(math.toradians(la))/2775;         ra = mvalues[0]+hang/2;         rx = lon+i*math.sin(math.toradians(ra))/2775;         ry = lat+i*math.cos(math.toradians(ra))/2775;          triangles[i] = map.addpolygon(new polygonoptions().add(new latlng(lat,lon), new latlng(ly,lx), new latlng(ry,rx)).strokecolor(color.transparent).fillcolor(color.argb(50, 0, 0, 50)));      } 

the fov blinking, , gc_concurrent happens. possible make not blinking?

thanks

https://developers.google.com/maps/documentation/android/shapes

according google documentation above.

you shall update shape calling polygon.setpoints link

rather remove/add.

hope help