example/main.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:admob/admob.dart';

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool _showInterstitialResponse;
  bool _loadInterstitialResponse;
  String APP_ID = "ca-app-pub-9929690287684724~2116069294";
  String INTERSTITIAL_AD_UNIT_ID = "ca-app-pub-9929690287684724/7809349294";
  String DEVICE_ID = "FF18F6CCC658F56ECA4C4623DB5082CA";
  bool TESTING = true;

  @override
  initState() {
    super.initState();
    loadInterstitialAd();
  }

  loadInterstitialAd() async {
    bool loadResponse;
    try {
      loadResponse = await Admob.loadInterstitial(APP_ID, INTERSTITIAL_AD_UNIT_ID, DEVICE_ID, TESTING);
    } on PlatformException {
      loadResponse = false;
    }
    setState(() {
      _loadInterstitialResponse = loadResponse;
    });
  }

  showInterstitialAd() async {
    bool showResponse;
    try {
      showResponse = await Admob.showInterstitial;
    } on PlatformException {
      showResponse = false;
    }
    setState(() {
      _showInterstitialResponse = showResponse;
    });
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Plugin example app'),
      ),
      body: new Center(child:new Text("$_loadInterstitialResponse")),
      floatingActionButton: new FloatingActionButton(
        onPressed: () => showInterstitialAd(),
        child: new Icon(Icons.add),
      ),
    );
  }
}