Flutter set floatingactionbutton text on interval basis - dart

Question

I have the following widget which will fit into a different parent widget into its body section. So in the parent widget I call this widget as below
body: MapsDemo(),. The issue now is that at this section I run an interval where every 30 seconds I want to call api to get all the latest markers.
Currently I print the count down as this codes print("${30 - timer.tick * 1}"); My issue is very simple I have 3 three floating action button and I have given them their id. Thus on each count down for the last floatingaction button which is btn3.text I am trying to set its value as ${30 - timer.tick * 1} but it does not work on this basis. How can I update the count down in the button?
class MapsDemo extends StatefulWidget {
#override
State createState() => MapsDemoState();
}
class MapsDemoState extends State<MapsDemo> {
GoogleMapController mapController;
#override
void initState() {
super.initState();
startTimer(30);
}
startTimer(int index) async {
print("Index30");
print(index);
new Timer.periodic(new Duration(seconds: 1), (timer) {
if ((30 / 1) >= timer.tick) {
print("${30 - timer.tick * 1}");
btn3.text = ${30 - timer.tick * 1};
} else {
timer.cancel();
var responseJson = NetworkUtils.getAllMarkers(
authToken
);
mapController.clearMarkers();
//startTimer(index + 1);
}
});
}
//Map<PermissionGroup, PermissionStatus> permissions = await PermissionHandler().requestPermissions([PermissionGroup.contacts]);import 'package:permission_handler/permission_handler.dart';
#override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
children: <Widget>[
GoogleMap(
onMapCreated: (GoogleMapController controller) {
mapController = controller;
},
initialCameraPosition: new CameraPosition(target: LatLng(3.326411697920109, 102.13127606037108))
),
Padding(
padding: const EdgeInsets.all(16.0),
child: Align(
alignment: Alignment.topRight,
child: Column(
children: <Widget>[
FloatingActionButton(
onPressed: () => print('button pressed'),
materialTapTargetSize: MaterialTapTargetSize.padded,
backgroundColor: Colors.lightBlue,
child: const Icon(Icons.map, size: 30.0),
heroTag: "btn1",
),
SizedBox(height: 5.0),
FloatingActionButton(
onPressed: () => print('second pressed'),
materialTapTargetSize: MaterialTapTargetSize.padded,
backgroundColor: Colors.lightBlue,
child: const Icon(Icons.add, size: 28.0),
heroTag: "btn2",
),
SizedBox(height: 5.0),
FloatingActionButton(
onPressed: () => print('second pressed'),
materialTapTargetSize: MaterialTapTargetSize.padded,
backgroundColor: Colors.lightBlue,
child: const Icon(Icons.directions_bike, size: 28.0),
heroTag: "btn3",
),
]
)
),
),
]
)
);
}
}

Answer 1

The below will display a countdown from 30 seconds inside of a FloatingActionButton.
import 'dart:async';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'FAB Countdown Demo',
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
static const _defaultSeconds = 30;
Timer _timer;
var _countdownSeconds = 0;
#override
void initState() {
_timer = Timer.periodic(Duration(seconds: 1), (Timer t) => _getTime());
super.initState();
}
#override
void dispose() {
_timer.cancel();
super.dispose();
}
void _getTime() {
setState(() {
if (_countdownSeconds == 0) {
_countdownSeconds = _defaultSeconds;
} else {
_countdownSeconds--;
}
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomPadding: false,
appBar: AppBar(
title: const Text('FAB Countdown Demo'),
),
floatingActionButton: FloatingActionButton(
child: Text('$_countdownSeconds'), onPressed: () {}),
);
}
}