Flutter How To Get Json Result Length

I'm new to flutter and I'm stuck using the carousel flutter swiper. I need help how to get the length of the json results to use with looping image.network. Here is my code: iklan

Solution 1:

You need to exchange the order of Swiper and FutureBuilder in the build() method:

  @override
  Widget build(BuildContext context) {
    return new Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: <Widget>[
        new ConstrainedBox(
          child: FutureBuilder<Map<String, dynamic>>(
            future: getData(),
            builder: (context, snapshot) {
              if (snapshot.connectionState == ConnectionState.done) {
                return new Swiper(
                    itemBuilder: (BuildContext context, int index) {
                      return new Image.network(
                        "http://mysite.go.id/wp/gambar_iklan/" +
                            snapshot.data.data[index].gambar_iklan,
                        fit: BoxFit.fitWidth,
                      );
                    },
                    itemCount: snapshot.data.length,
                    viewportFraction: 0.8,
                    autoplay: true,
                    scale: 0.9,
                    itemHeight: MediaQuery.of(context).size.width / 6);
              } else {
                return new CircularProgressIndicator();
              }
            },
          ),
          constraints: new BoxConstraints.loose(
              new Size(MediaQuery.of(context).size.width, 170.0)),
        ),
      ],
    );
  }