Android Bitmap Circle和Draw Border

Question

我正在使用Android API-14

我想创建圆形位图并绘制边框。我写这段代码;

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
    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());

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 100);
    // paint.setColor(color);
    canvas.drawCircle(bitmap.getWidth() / 2,
            bitmap.getHeight() / 2, bitmap.getWidth() / 2, paint);
    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

    paint.setColor(Color.WHITE);
    paint.setStyle(Paint.Style.STROKE);
    paint.setStrokeWidth((float) 50);

    canvas.drawBitmap(bitmap, rect, rect, paint);

    return output;

    }

但它只能是一个位图圈。但我不能在它周围画一个边界。 我怎么解决这个问题？ 感谢。