Android图片圆角处理

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public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {      Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),          bitmap.getHeight(), Config.ARGB_8888);      Canvas canvas = new Canvas(output);         final int color = 0xff424242;      final Paint paint = new Paint();      final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());      final RectF rectF = new RectF(rect);      final float roundPx = 12;         paint.setAntiAlias(true);      canvas.drawARGB(0, 0, 0, 0);      paint.setColor(color);      canvas.drawRoundRect(rectF, roundPx, roundPx, paint);         paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));      canvas.drawBitmap(bitmap, rect, rect, paint);         return output;    }