Add card widget after pressing a button - flutter

Question

I am trying to dynamically add a card in a row in my app after pressing a button.
I tried different things but nothing seems to work properly, right now I reached this point:
cardList = [];
setState(() {
cardList.add(new DynamicCard());
});
}
This is the method that I call to add a new card and it is called in the following alertDialog:
return Alert(
context: context,
title: "Add activity",
content: Column(
children: <Widget>[
DropdownButton(
hint: Text('Select your activity'),
icon: Icon(Icons.arrow_drop_down),
value: selectedActivity,
onChanged: (value){
setState(() {
value = selectedActivity;
print(value);
});
},
//value: selectedActivity,
items: activityList.map((value) {
return DropdownMenuItem(
value: value,
child: Text(value));
}).toList()
),
TextField(
decoration: InputDecoration(
labelText: 'Where',
),
),
],
),
buttons: [
DialogButton(
onPressed: () {
addCard();
Navigator.pop(context);
},
child: Text(
"Add Activity",
style: TextStyle(color: Colors.white, fontSize: 20),
),
)
]).show();
This is the card I'd like to add after pressing on the button:
import 'package:flutter/material.dart';
import 'package:wildnature/widgets/sizeConfig.dart';
class DynamicCard extends StatelessWidget {
#override
Widget build(BuildContext context) {
return SizedBox(
height: 250,
width: 350,
child: Card(
elevation: 6,
clipBehavior: Clip.antiAlias,
child: Column(
children: [
ListTile(
title: Text('Last Activity:'),
),
Padding(
padding: EdgeInsets.all(8.0),
child: Text(
'Test123',
style:
TextStyle(fontSize: 5 * SizeConfig.blockSizeHorizontal),
)),
Container(
width: 200,
height: 160,
child: Image.asset('assets/camping.png', fit: BoxFit.fill),
)
],
),
),
);
}
}
Also, how can I render this widget in the exact place I want it to be?

Answer 1

Solution:
Created a new variable:
bool addWidget = false;
created a new widget:
Widget createActivityCard(String activy, String activityDesc){
return SizedBox(
height: 250,
width: 350,
child: Card(
elevation: 6,
clipBehavior: Clip.antiAlias,
child: Column(
children: [
ListTile(
title: Text(activy),
),
Padding(
padding: EdgeInsets.all(8.0),
child: Text(
activityDesc,
style:
TextStyle(fontSize: 5 * SizeConfig.blockSizeHorizontal),
)),
Container(
width: 200,
height: 160,
child: Image.asset('assets/camping.png', fit: BoxFit.fill),
)
],
),
),
);
}
Set the value of addWidget to 'true' when pressing on a button
Added a simple if statement where the condition is addWidget:
if(addWidget)
Container(
child: createActivityCard('Added by user', 'WE DID IT'))
```