CarouselWidget.dart

int _current = 0;
Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        CarouselSlider(
          options: CarouselOptions(
            autoPlay: true,
            height: 250,
            viewportFraction: 1.0,
            onPageChanged: (index, reason) {
              setState(() {
                _current = index;
              });
            },
          ),
          items: imgNews.map(
            (url) {
            return Container(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: <Widget>[
                  ClipRRect(
                    child: Image.asset(
                      url,
                      fit: BoxFit.fill,
                      height: 250,
                    ),
                    ),
                  ],
                  ) 
                );
              },
          ).toList(),      
        ),
        Padding(
          padding: EdgeInsets.only(top:10),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: map<Widget>(imgNews, (index, url) {
              return Container(
                width: 6.0,
                height: 8.0,
                margin: EdgeInsets.symmetric(vertical: 10.0, horizontal: 5.0),
                decoration: BoxDecoration(
                  shape: BoxShape.circle,
                  color: _current == index ? Colors.red : Colors.blueGrey,
                ),
              );
            }),
          ),
        ),
      ]
    );
  }