Android图像模糊圆角

Question

我有图像列表。我使用此功能对图像的边角进行了舍入：

public Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
        Bitmap output = null;
        try {
            if(bitmap != null) {
                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 = pixels;

                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);
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return output;
    }

它成功地围绕图像的角落，但角落模糊，粗糙和像素化。角落不顺畅。示例输出为：

我该如何解决这个问题？

Answer 1

我的代码中没有任何问题，但我使用此代码：

public static Bitmap roundBitmap(Bitmap bitmap, int radius) {
    Paint paintForRound = new Paint();
    paintForRound.setAntiAlias(true);
    paintForRound.setColor(0xff424242);
    paintForRound.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(output);

    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
    final RectF rectF = new RectF(rect);

    canvas.drawARGB(0, 0, 0, 0);
    paintForRound.setXfermode(null);

    canvas.drawRoundRect(rectF, radius, radius, paintForRound);

    paintForRound.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paintForRound);

    return output;
}

此代码给出了像素完美的结果：

Answer 2

使用此公式

使用角半径

float roundPx = bitmap.getWidth() > bitmap.getHeight() ? ((float) bitmap.getHeight())/6 : ((float) bitmap.getWidth())/6;
        roundPx = roundPx < 10 ? 10 : roundPx;