public static Bitmap roundCorners(final Bitmap source, final float radius) {
        int width = source.getWidth();
        int height = source.getHeight();

        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setColor(WHITE);

        Bitmap clipped = Bitmap.createBitmap(width, height, ARGB_8888);
        Canvas canvas = new Canvas(clipped);
        canvas.drawRoundRect(new RectF(0, 0, width, height), radius, radius,
                paint);
        paint.setXfermode(new PorterDuffXfermode(DST_IN));

        Bitmap rounded = Bitmap.createBitmap(width, height, ARGB_8888);
        canvas = new Canvas(rounded);
        canvas.drawBitmap(source, 0, 0, null);
        canvas.drawBitmap(clipped, 0, 0, paint);

        source.recycle();
        clipped.recycle();

        return rounded;
    }
Round the corners of a {@link Bitmap}

@param source
@param radius
@return rounded corner bitmap
app/src/main/java/com/github/pockethub/android/util/ImageUtils.java