Android图片处理实例介绍(图)

/**
     * 转换成圆角
     *
     * @param bmp
     * @param roundPx
     * @return
     */
    public static Bitmap convertToRoundedCorner(Bitmap bmp, float roundPx) {

        Bitmap newBmp = Bitmap.createBitmap(bmp.getWidth(), bmp.getHeight(),
                Config.ARGB_8888);
        // 得到画布
        Canvas canvas = new Canvas(newBmp);

        final int color = 0xff424242;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, bmp.getWidth(), bmp.getHeight());
        final RectF rectF = new RectF(rect);

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        // 第二个和第三个参数一样则画的是正圆的一角，否则是椭圆的一角
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bmp, rect, rect, paint);

        return newBmp;
    }