转换图片成圆形--并且缩放 Bitmap、Java、Android 图片设计

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/**
     * 转换图片成圆形--并且缩放
     * @param bitmap 传入Bitmap对象
     * @return
     */
    public Bitmap toRoundBitmap(Bitmap bitmap,float scale) {
            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);

            //缩放功能
            Matrix matrix=new Matrix();
            matrix.postScale(scale, scale);
            Bitmap temp = Bitmap.createBitmap(output,0,0,output.getWidth(),output.getHeight(),matrix,true);
            return temp;//否则return output即可
    }

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