Detect when user is not interacting the app in Flutter - flutter

Question

I want to show some Screensaver type of screen when the user is not interacting the app for 5 minutes. So is anyone know how to achieve this kind of functionality in flutter.
import 'dart:async';
import 'package:flutter/material.dart';
const timeout = const Duration(seconds: 10);
const ms = const Duration(milliseconds: 1);
Timer timer;
void main() =>
runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
var home = MyHomePage(title: 'Flutter Demo Home Page');
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: home,
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _goToSecondScreen() {
Navigator.pushReplacement(
context,
MaterialPageRoute(builder: (context) => SecondPage()),
);
}
#override
Widget build(BuildContext context) {
return GestureDetector(child: Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Container(),
floatingActionButton: FloatingActionButton(
onPressed: _goToSecondScreen,
tooltip: 'Increment',
child: Icon(Icons.add),
),
), behavior:
HitTestBehavior.translucent, onTapDown: (tapdown) {
print("down");
if (timer != null) {
timer.cancel();
}
timer = startTimeout();
},);
}
startTimeout([int milliseconds]) {
var duration = milliseconds == null ? timeout : ms * milliseconds;
return new Timer(duration, handleTimeout);
}
void handleTimeout() {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => ScreenSaver()),
);
}
}
class SecondPage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Container();
}
}
class ScreenSaver extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new GestureDetector(child:Container(color: Colors.yellow,),
onTap: (){
Navigator.pop(context);
},
);
}
}
This is the sample code which I am trying to achieve the functionality. When the screen in active in Second screen its not working and the GestureDetector stops listening.

Answer 1

You can wrap your whole app in a GestureDetector with behavior:
HitTestBehavior.translucent to receive touch events while allowing widgets in your app also receiving these touch events.
You might also want to listen to keyboard events External keyboard in flutter support