Bitmap图片设置任意角为圆角

1. 当我们需要将Bitmap图片设置任意角为圆角时可以使用drawRoundRect(reaf,x,y,reaf)函数来设置

2. 任意圆角

/***
         * Parameters
         * rectf The rectangular bounds of the roundRect to be drawn
         * rx The x-radius of the oval used to round the corners
         * ry The y-radius of the oval used to round the corners
         * x,y方向上的圆角半径，个人设置200比较好
         * paint The paint used to draw the roundRect
         */
 public Bitmap bimapRound(Bitmap mBitmap,float index){
        Bitmap bitmap = Bitmap.createBitmap(mBitmap.getWidth(), mBitmap.getHeight(), Bitmap.Config.ARGB_4444);

        Canvas canvas = new Canvas(bitmap);
        Paint paint = new Paint();
        paint.setAntiAlias(true);

        //设置矩形大小
        Rect rect = new Rect(0,0,mBitmap.getWidth(),mBitmap.getHeight());
        RectF rectf = new RectF(rect);

        // 相当于清屏
        canvas.drawARGB(0, 0, 0, 0);
        //画圆角
        /***
         * Parameters
         * rectf The rectangular bounds of the roundRect to be drawn
         * rx The x-radius of the oval used to round the corners
         * ry The y-radius of the oval used to round the corners
         * x,y方向上的圆角半径
         * paint The paint used to draw the roundRect
         */
        canvas.drawRoundRect(rectf, index, index, paint);
        // 取两层绘制，显示上层
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));

        // 把原生的图片放到这个画布上，使之带有画布的效果
        canvas.drawBitmap(mBitmap, rect, rect, paint);
        return bitmap;

    }

1. 圆形图片

        public static Bitmap toRoundBitmap(Bitmap bitmap) {//bitmap图片
            int width = bitmap.getWidth();
            int height = bitmap.getHeight();
            float roundPx;
            float left, top, right, bottom, dst_left, dst_top, dst_right, dst_bottom;
            if (width <= height) {
                roundPx = width / 2;
                top = 0;
                bottom = width;
                left = 0;
                right = width;
                height = width;
                dst_left = 0;
                dst_top = 0;
                dst_right = width;
                dst_bottom = width;
            } else {
                roundPx = height / 2;
                float clip = (width - height) / 2;
                left = clip;
                right = width - clip;
                top = 0;
                bottom = height;
                width = height;
                dst_left = 0;
                dst_top = 0;
                dst_right = height;
                dst_bottom = height;
            }
            Bitmap output = Bitmap.createBitmap(width,
                    height, Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(output);
            final int color = 0xff424242;
            final Paint paint = new Paint();
            final Rect src = new Rect((int) left, (int) top, (int) right, (int) bottom);
            final Rect dst = new Rect((int) dst_left, (int) dst_top, (int) dst_right, (int) dst_bottom);
            final RectF rectF = new RectF(dst);
            paint.setAntiAlias(true);
            canvas.drawARGB(0, 0, 0, 0);
            paint.setColor(color);
            canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
            paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
            canvas.drawBitmap(bitmap, src, dst, paint);
            return output;
        }