/**     * 将图片的四角圆化     * @param bitmap 原图     * @param roundPixels 圆滑率     * @param half 是否截取半截     * @return     */    public static Bitmap getRoundCornerImage(Bitmap bitmap, int roundPixels,int half)    {    	int width=bitmap.getWidth();    	int height=bitmap.getHeight();    	        //创建一个和原始图片一样大小位图        Bitmap roundConcerImage = Bitmap.createBitmap(width,height, Config.ARGB_8888);        //创建带有位图roundConcerImage的画布        Canvas canvas = new Canvas(roundConcerImage);        //创建画笔        Paint paint = new Paint();        //创建一个和原始图片一样大小的矩形        Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());        RectF rectF = new RectF(rect);        // 去锯齿        paint.setAntiAlias(true);                        //画一个和原始图片一样大小的圆角矩形        canvas.drawRoundRect(rectF, roundPixels, roundPixels , paint);        //设置相交模式        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));        //把图片画到矩形去        canvas.drawBitmap(bitmap, null, rect, paint);        switch(half){        	case HalfType.LEFT:        		return Bitmap.createBitmap(roundConcerImage, 0, 0, width/2, height);        	case HalfType.RIGHT:        		return Bitmap.createBitmap(roundConcerImage, width/2, 0, width/2, height);        	case HalfType.TOP:        		return Bitmap.createBitmap(roundConcerImage, 0, 0, width, height/2);        	case HalfType.BOTTOM:        		return Bitmap.createBitmap(roundConcerImage, 0, height/2, width, height/2);        	case HalfType.NONE:        		return roundConcerImage;        	default:        		return roundConcerImage;        }    }

剪裁圆形图片

        /**         * 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;        }