android - Drawing an outer shadow when drawing an image -

i create rounded version of image in app drawing canvas. draw faint outershadow around image, cant quite right. have 2 questions: 1. how can draw outer shadow (i can seem draw shadow x or y offset) 2. how can draw shadow not have artifacts shown in attached image. code:

![public bitmap getroundedcornerbitmap(bitmap bitmap, float cornerradius) {         bitmap output = bitmap.createbitmap(bitmap.getwidth()+6, bitmap.getheight() +6, config.argb_8888);         canvas canvas = new canvas(output);          final int color = 0xff424242;         int shadowradius = getdipsfrompixel(3);         final rect imagerect = new rect(shadowradius, shadowradius, bitmap.getwidth(), bitmap.getheight());         final rectf rectf = new rectf(imagerect);          // not achieve desired effect         paint shadowpaint = new paint();         shadowpaint.setantialias(true);         shadowpaint.setcolor(color.black);         shadowpaint.setshadowlayer((float)shadowradius, 2.0f, 2.0f,color.black);         canvas.drawoval(rectf, shadowpaint);          canvas.drawargb(0, 0, 0, 0);         final paint paint = new paint();         paint.setantialias(true);         paint.setcolor(color);          canvas.drawroundrect(rectf, cornerradius, cornerradius, paint);          paint.setxfermode(new porterduffxfermode(mode.src_in));         canvas.drawbitmap(bitmap, imagerect, imagerect, paint);          return output;     }][1] 

this example of effect trying achieve:

here go

yup still dig nexus s

first of all, please stop masking bitmaps way, can accomplish without allocating bitmap, checkout this blog post how draw rounded (and shape) images.

second using drawable can figure out how add shadow, make sure not clipped, on 18+ use viewoverlays that, keep in mind there several unsupported drawing operations hardware accelerated layers, includes setshadowlayer , blurmaskfilter, if performance not issue you, can disable always:

if (sdk_int >= honeycomb) {   view.setlayertype(view.layer_type_software, null); } 

and use setshadowlayer trying already:

somepaint.setshadowlayer(shadowsize, deltax, deltay, shadowcolor); 

for sample please check link @ end.

if still want hardware accelerated have fake @ risk of overdrawing, use radial gradient or draw oval blurring (as mentioned before can't use blurmaskfilter) or use pre-blurred bitmap (more masking).

for such subtle shadow rather go flat if performance required, the full sauce in banana stand.

update: starting l can use real shadows.