@override Widget build(BuildContext context) {

    Column screen = Column(
        ....
        ,
        Expanded(
          child:
          ListView.builder(
            padding: EdgeInsets.all(0.0),
            itemCount: tasks.length
            itemBuilder: (context, index) {
                return RadioListTile<String>(
                    title:  Text(tasks[index], style: TextStyle(fontSize: 16.0, fontWeight: FontWeight.w400)),
                    value: tasks[index],
                    groupValue: selectedRadio,
                    onChanged: (val){
                      setSelectedRadio(val);
                    }
                );
            },
          ),
        ),
      ],
    );

    return Scaffold(
      body: screen,
    );
  }