Flutter: Banner Ad Overlapping The Main Screen - dart

Question

I am doing a Flutter app and managed to show the AdMob banner ad, however the ad overlaps the bottom of my app's main screen:
By following this article, I managed to make the app screen's bottom properly displayed, but the persistentFooterButtons is sacrificed, which I think is not an ideal solution.
I am thinking about putting the Scaffold object and a fixed height area into a column that is contained by a Center object, something similar to the following:
#override
Widget build(BuildContext context) {
return new Center(
child: new Column (
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
new Expanded (
child: _getScaffold(),
),
new Expanded (
child: new Container(height: 50.0,)
)
],
),
);
}
But in this way I get the exception "A RenderFlex overflowed by 228 pixels on the bottom":
Anybody can show me how to build such layout? I want every component of my scaffold properly displayed, with a fixed height dummy footer that is ok to be overlapped by the Admob's banner ad.
Any help is much welcome.
Jimmy

Answer 1

Also we can add some trick like bottomNavigationBar under the Scaffold
bottomNavigationBar: Container(
height: 50.0,
color: Colors.white,
),
This will take floating button up.

Answer 2

Finally I got it:
#override
Widget build(BuildContext context) {
return new Center(
child: new Column (
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
new Expanded (
child: _getScaffold(),
),
new Container(height: 50.0,
child: new Placeholder(color:Colors.blue))
],
),
);
}
The trick is Expanded here is for the Scaffold only, but for the dummy footer just a fixed height Container is required. Now I can display everything available from the Scaffold object.
Layout building of Flutter sometimes really confuses me...

Answer 3

If I understand your question well, I think you want to have your ad shown from the bottom while using a FAB. I think using a Stack widget here is a good solution, I created this example in a rush but should be enough to show you what I mean:
class AdBar extends StatefulWidget {
#override
_AdBarState createState() => new _AdBarState();
}
class _AdBarState extends State<AdBar> {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(),
body: new ListView(
children: new List.generate(50, (int index) {
return new Text("widgets$index");
}),
),
persistentFooterButtons:
<Widget>[
new Stack(
children: <Widget>[
new Container (
color: Colors.transparent,
child: new Material(
color: Colors.cyanAccent,
child: new InkWell(
onTap: () {
},
child: new Container(
//color: Colors.cyanAccent,
width: MediaQuery
.of(context)
.size
.width * 0.90,
height: MediaQuery
.of(context)
.size
.height * 0.25,
),
),),),
new Positioned(
right: 0.0,
child: new FloatingActionButton(
onPressed: () {}, child: new Icon(Icons.fastfood)))
],
)
]
);
}
}