Use pushNamed with Dismissible Widget - dart

Question

I am trying to create a Dismissible widget but I want to have the router history, I mean when I go to another route using the onDismissed event, when user presses back button on that new view be return to the first one.
This is my widget.
Dismissible(
key: new ValueKey("dismiss_key"),
direction: DismissDirection.horizontal,
child: Container(child: this.getTopPlacesSubscription()),
onDismissed: (direction) {
if (direction == DismissDirection.endToStart) {
Navigator.of(context).pushNamed(Router.getRoute(Routes.map));
}
if (direction == DismissDirection.startToEnd) {
Navigator.of(context)
.pushNamed(Router.getRoute(Routes.camera));
}
}
I will appreciate any help.
I got an issue trying to do it in this way.

Answer 1

This code block will let you create a random string based on length. Add this to your code.
import 'dart:math';
String _randomString(int length) {
var rand = new Random();
var codeUnits = new List.generate(
length,
(index){
return rand.nextInt(33)+89;
}
);
return new String.fromCharCodes(codeUnits);
}
In your state, define a new variable and give it a random value.
String vk;
#override
void initState() {
this.vk = _randomString(10)
}
Then go to your Dismissable widget and replace vk with your string. And here comes the magic part lol. You have to change your vk value in onDismissed. This will pass a new value to Dismissable key, so Flutter will recognize it as a new Widget, which will prevent the error.
Dismissible(
key: new ValueKey(vk),
direction: DismissDirection.horizontal,
child: Container(child: this.getTopPlacesSubscription()),
onDismissed: (direction) {
setState(() {
this.vk = _randomString(10);
});
if (direction == DismissDirection.endToStart) {
Navigator.of(context).pushNamed(Router.getRoute(Routes.map));
}
if (direction == DismissDirection.startToEnd) {
Navigator.of(context)
.pushNamed(Router.getRoute(Routes.camera));
}
}