.dart

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    String networkimg =
        'https://cdn.dribbble.com/users/750517/screenshots/8574989/media/7610aa397363fdfe6f2daa1145493aee.gif';
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          RaisedButton(
            key: keys[0],
            child: Text('Network Giffy'),
            onPressed: () {
              showDialog(
                  context: context,
                  builder: (_) => NetworkGiffyDialog(
                    key: keys[1],
                        image: Image.network(
                          networkimg,
                          fit: BoxFit.cover,
                        ),
                        title: Text(
                          "Ostrich Running",
                          style: TextStyle(
                            fontSize: 22.0,
                            fontWeight: FontWeight.bold,
                          ),
                        ),
                        description: Text(
                          'This is the Ostrich Running Dialog Box. This will help you to understand NEtwork Giffy Animation',
                          textAlign: TextAlign.center,
                        ),
                        entryAnimation: EntryAnimation.RIGHT,
                        onOkButtonPressed: (){},
                      ));
            },
          ),
        ],
      ),
    );
  }
}