Create a Stack->ListView->Positioned

test.dart

      body: new Stack(
        children: <Widget>[
          new Container(
            decoration: _recursos.backgroundImageComun(),
          ),
          new Column(
            children: <Widget>[
              new Container(
                  height: 196.0,
                  child: new Stack(
                    children: <Widget>[
                      new ListView(
                        scrollDirection: Axis.horizontal,
                        children: new List.generate(15, (int index) {
                           new Positioned(
                             
                              child: new GestureDetector(
                                  onTap: () {
                                    randomizer(index);
                                  },
                                  child: new Container(
                                      width: 110.0,
                                      height: 196.0,
                                      child: new Image(
                                          image: new AssetImage(
                                              'assets/bgcard-a.jpg'),
                                          fit: BoxFit.cover))));
                        }),
                      )
                    ],
                  ))
            ],
          )
        ],
      ),