Android裁剪图片为圆形图片

以前在eoe论坛中找过裁剪图片为圆形图片的方法,但是效果都不是很理想,这几天因为公司业务的要求,需要对头像进行裁剪以圆形
的方式显示,这个方法是根据传入的图片的高度(height)和宽度(width)决定的,如果是 width <= height
时,则会裁剪高度,裁剪的区域是宽度不变高度从顶部到宽度width的长度;如果 width >
height,则会裁剪宽度,裁剪的区域是高度不变,宽度是取的图片宽度的中心区域,不过不同的业务需求,对裁剪图片要求不一样,可以根据业务的需求来调
整裁剪的区域。

好了,不多说了,直接上代码

 

        /**
         * 转换图片成圆形
         * @param bitmap 传入Bitmap对象
         * @return
         */
        public Bitmap toRoundBitmap(Bitmap bitmap) {
                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, 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(Mode.SRC_IN));
                canvas.drawBitmap(bitmap, src, dst, paint);
                return output;
        }

 

 

 

 

 

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