为Bitmap添加圆角

来源：互联网发布：老子三章天下皆知编辑：程序博客网时间：2024/06/06 23:17

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {

    Bitmap utput = Bitmap.createBitmap(bitmap.getWidth(),    bitmap.getHeight(), Config.ARGB_8888);    //得到画布    Canvas canvas = new Canvas(output);    //将画布的四角圆化    final int color = Color.RED;    final Paint paint = new Paint();    //得到与图像相同大小的区域 由构造的四个值决定区域的位置以及大小    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());    final RectF rectF = new RectF(rect);    //值越大角度越明显    final float roundPx = 50;    paint.setAntiAlias(true);    canvas.drawARGB(0, 0, 0, 0);    paint.setColor(color);    //drawRoundRect的第2,3个参数一样则画的是正圆的一角，如果数值不同则是椭圆的一角    canvas.drawRoundRect(rectF, roundPx,roundPx, paint);    paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));    canvas.drawBitmap(bitmap, rect, rect, paint);    return output;    }

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