Adjust height on long press.

main.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  final List<MeetingCard> _meetingCards = [
          MeetingCard(title: 'standup meeitng'),
          MeetingCard(title: 'weekely meeting'),          
          MeetingCard(title: 'Status Meeting'),
          MeetingCard(title: 'Another meeting'),
    
  ];
  
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Adjustable height card.',
      home: ListView.builder(
        itemCount: _meetingCards.length,
        itemBuilder: (context, index){
          return _meetingCards[index];
        }
      ),
    );
  }
}

// Define a custom Form widget.
class MeetingCard extends StatefulWidget {
  final String title;
  
  MeetingCard({this.title});
  @override
  _MeetingCardState createState() => _MeetingCardState();
}

// Define a corresponding State class.
class _MeetingCardState extends State<MeetingCard> {

  // this height is specific to this widget.
  double height = 130;

  @override
  Widget build(context) {
    return GestureDetector(
      onLongPress: (){
        setState((){
          height = height == 130 ? 150 : 130;
        });
      },
      child: AnimatedContainer(
        duration: new Duration(milliseconds: 500),
        height: height,
        child: Card(child: Center(child: Text(widget.title),),),
      ),
    );
  }
}