How to show interstitial ads evry 20 seconds in flutter dart

Question

i have a problem implementing interstitial timed ads with flutter. i have implemented one option which shows ads when a button is clicked but i want to implement where it shows ad every 20 seconds.please help

am using the code below i found online

import 'package:flutter/material.dart';
import 'package:firebase_admob/firebase_admob.dart';

const String testDevice = 'MobileId';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  static const MobileAdTargetingInfo targetingInfo = MobileAdTargetingInfo(
    testDevices: testDevice != null ? <String>[testDevice] : null,
    nonPersonalizedAds: true,
    keywords: <String>['Game', 'Mario'],
  );

  BannerAd _bannerAd;
  InterstitialAd _interstitialAd;

  BannerAd createBannerAd() {
    return BannerAd(
        adUnitId: BannerAd.testAdUnitId,
      //Change BannerAd adUnitId with Admob ID
        size: AdSize.banner,
        targetingInfo: targetingInfo,
        listener: (MobileAdEvent event) {
          print("BannerAd $event");
        });
  }

  InterstitialAd createInterstitialAd() {
    return InterstitialAd(
        adUnitId: InterstitialAd.testAdUnitId,
      //Change Interstitial AdUnitId with Admob ID
        targetingInfo: targetingInfo,
        listener: (MobileAdEvent event) {
          print("IntersttialAd $event");
        });
  }

  @override
  void initState() {
    FirebaseAdMob.instance.initialize(appId: BannerAd.testAdUnitId);
    //Change appId With Admob Id
    _bannerAd = createBannerAd()
      ..load()
      ..show();
    super.initState();
  }

  @override
  void dispose() {
    _bannerAd.dispose();
    _interstitialAd.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(),
      home: Scaffold(
        appBar: AppBar(
          title: Text("Demo App"),
        ),
        body: Center(
            child: RaisedButton(
          child: Text('Click on Ads'),
          onPressed: () {
            createInterstitialAd()
              ..load()
              ..show();
          },
        )),
      ),
    );
  }
}

am using the flutter language and there are not many tutorials online yet because the community is still growing

Solution

Try to add the following to your code:

import 'dart:async'; // <-- put  it on very top of your file

Timer _timerForInter; // <- Put this line on top of _MyAppState class

@override
void initState() {
  // Add these lines to launch timer on start of the app
  _timerForInter = Timer.periodic(Duration(seconds: 20), (result) {
  _interstitialAd = createInterstitialAd()..load();
  });
  super.initState();
 }

 @override
 void dispose() {
   // Add these to dispose to cancel timer when user leaves the app
   _timerForInter.cancel();
   _interstitialAd.dispose();
   super.dispose();
}

Comments

[Joseph M]

it says class not found when i put Timer _timerForInter; // <- Put this line on top of _MyAppState class

[emvaized]

@josephmuchoki I guess you have to add 'import 'dart:async'; " on very top of your file.

[Joseph M]

thanks, it worked. one spelling error from your code i have rectified, and a missing semicolon... check full code below

[Joseph M]

import 'dart:async'; Timer _timerForInter; @override void initState() { FirebaseAdMob.instance.initialize(appId: BannerAd.testAdUnitId); //Change appId With Admob Id _bannerAd = createBannerAd() ..load() ..show(); _timerForInter = Timer.periodic(Duration(seconds: 20), (result) { _interstitialAd = createInterstitialAd()..load(); }); super.initState(); } @override void dispose() { _bannerAd.dispose(); _timerForInter.cancel(); _interstitialAd.dispose(); super.dispose(); }

[Joseph M]

its not aligning but those are the changes

[emvaized]

@josephmuchoki Oh, sorry - I wrote it from my phone; fixed typos now. Please mark my answer as correct if it solves your problem :)