@override Widget build(BuildContext context) {

    Column taskView = Column(

      children: <Widget>[
        ...,
        Expanded(
          child: ListView.builder(
            padding: EdgeInsets.all(0.0),
            itemCount: tasks.length,
            itemBuilder: (context, index) {
              return RadioListTile<String>(
                title:  Text(tasks[index]),
                value: tasks[index],
                groupValue: selectedRadio,
                onChanged: (val){
                    setSelectedRadio(val);
                }
              );
            },
          ),
        ),
      ],
    );
    return Scaffold(
      body: taskView,
    );
  }