cod_prueba.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class Prueba extends StatefulWidget {
  @override
  _PruebaState createState() => _PruebaState();
}

class _PruebaState extends State<Prueba> {
  ScrollController _scrollController;
  bool _flag = true;
  String nomLocal;
  String descripcion;
  String descripcion2;
  Widget notifCard(String nomLocal, String descripcion, String descripcion2,
      bool isVisible) {
    return Container(
      child: GestureDetector(
        onTap: () {
          setState(() {
            _flag = isVisible;
          });
        },
        child: Card(
          margin: EdgeInsets.only(left: 15, right: 15, top: 10),
          elevation: 2,
          shape:
              RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
          color: Colors.white.withOpacity(.9),
          child: Container(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: <Widget>[
                Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: <Widget>[
                    Container(
                      padding: EdgeInsets.only(left: 15, top: 10),
                      child: Text(
                        nomLocal,
                        style: TextStyle(
                            fontSize: 15.0,
                            color: Colors.black,
                            fontFamily: 'Roboto',
                            fontWeight: FontWeight.bold),
                      ),
                    ),
                    Container(
                      padding: EdgeInsets.only(left: 15, top: 10),
                      height: 50,
                      width: 250,
                      child: Text(
                        descripcion,
                        maxLines: 2,
                        overflow: TextOverflow.clip,
                        style: TextStyle(
                          fontSize: 15.0,
                          color: Colors.black,
                          fontFamily: 'Roboto',
                        ),
                      ),
                    ),
                  ],
                ),
                Column(
                  children: <Widget>[
                    SizedBox(
                      height: MediaQuery.of(context).size.height - 620,
                    ),
                    Padding(
                        padding: EdgeInsets.only(bottom: 5, right: 20),
                        child: Container(
                          height: 20,
                          width: 70,
                          child: Visibility(
                            visible: _flag ? true : false,
                            child: RaisedButton(
                              shape: RoundedRectangleBorder(
                                  borderRadius: BorderRadius.circular(20)),
                              child: Center(
                                child: Text(
                                  'Nueva',
                                  style: TextStyle(
                                      fontSize: 12,
                                      color: Colors.white,
                                      fontWeight: FontWeight.bold),
                                ),
                              ),
                              elevation: 15,
                              onPressed: () {},
                              color: Color(0xFF2DA771),
                            ),
                          ),
                        ))
                  ],
                )
              ],
            ),
          ),
        ),
      ),
    );
  }

  List<Widget> itemsNotif = [
    notifCard(nomLocal, descripcion, descripcion2, _flag),
  ];
  _alertDialog() {
    return showDialog(
        context: context,
        builder: (BuildContext context) {
          return AlertDialog(
            title: Text('nomLocal'),
            content: Text('descripcion + descripcion2'),
          );
        });
  }

  _alertDialog2() {
    return showDialog(
        context: context,
        builder: (BuildContext context) {
          return AlertDialog(
            title: Text('nomLocal'),
            content: Text('descripcion + descripcion2'),
          );
        });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ListView.builder(
        controller: _scrollController,
        itemBuilder: (context, position) {
          return Padding(
              padding: const EdgeInsets.only(bottom: 2),
              child: GestureDetector(
                child: itemsNotif[position],
                onTap: () {
                  //Aca irian los popUp
                },
              ));
        },
        itemCount: itemsNotif.length,
      ),
    );
  }
}