Add ad inspector button to mediation example

samples/admob/mediation_example/ios/Flutter/AppFrameworkInfo.plist

@@ -21,6 +21,6 @@
   <key>CFBundleVersion</key>
   <string>1.0</string>
   <key>MinimumOSVersion</key>
-  <string>11.0</string>
+  <string>12.0</string>
 </dict>
 </plist>

samples/admob/mediation_example/ios/Runner.xcodeproj/project.pbxproj

@@ -375,6 +375,7 @@
 				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = Runner/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -498,6 +499,7 @@
 				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = Runner/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -516,6 +518,7 @@
 				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = Runner/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",

samples/admob/mediation_example/lib/app_bar_item.dart

@@ -0,0 +1,13 @@
+/// Example app bar class.
+class AppBarItem {
+  /// Helper variable for the ad inspector button text.
+  static const adInpsectorText = 'Ad Inspector';
+
+  /// Button text.
+  final String label;
+  /// Button value.
+  final int value;
+
+  /// Initialize the class.
+  AppBarItem(this.label, this.value);
+}

samples/admob/mediation_example/lib/main.dart

@@ -16,7 +16,9 @@
 
 import 'package:flutter/material.dart';
 import 'package:google_mobile_ads/google_mobile_ads.dart';
-import 'package:mediationexample/my_method_channel.dart';
+
+import 'app_bar_item.dart';
+import 'my_method_channel.dart';
 
 void main() {
   WidgetsFlutterBinding.ensureInitialized();
@@ -30,23 +32,14 @@ void main() {
   runApp(MyApp());
 }
 
-/// A simple app that loads an ad and shows a button which increments a counter.
+/// An example app that loads an ad and shows a button which increments a counter.
 class MyApp extends StatelessWidget {
   // This widget is the root of your application.
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
       title: 'Flutter Mediation Example',
       theme: ThemeData(
-        // This is the theme of your application.
-        //
-        // Try running your application with "flutter run". You'll see the
-        // application has a blue toolbar. Then, without quitting the app, try
-        // changing the primarySwatch below to Colors.green and then invoke
-        // "hot reload" (press "r" in the console where you ran "flutter run",
-        // or simply save your changes to "hot reload" in a Flutter IDE).
-        // Notice that the counter didn't reset back to zero; the application
-        // is not restarted.
         primarySwatch: Colors.blue,
       ),
       home: MyHomePage(title: 'Flutter Demo Home Page'),
@@ -57,15 +50,6 @@ class MyApp extends StatelessWidget {
 class MyHomePage extends StatefulWidget {
   MyHomePage({Key? key, required this.title}) : super(key: key);
 
-  // This widget is the home page of your application. It is stateful, meaning
-  // that it has a State object (defined below) that contains fields that affect
-  // how it looks.
-
-  // This class is the configuration for the state. It holds the values (in this
-  // case the title) provided by the parent (in this case the App widget) and
-  // used by the build method of the State. Fields in a Widget subclass are
-  // always marked "final".
-
   final String title;
 
   @override
@@ -80,11 +64,6 @@ class _MyHomePageState extends State<MyHomePage> {
 
   void _incrementCounter() {
     setState(() {
-      // This call to setState tells the Flutter framework that something has
-      // changed in this State, which causes it to rerun the build method below
-      // so that the display can reflect the updated values. If we changed
-      // _counter without calling setState(), then the build method would not be
-      // called again, and so nothing would appear to happen.
       _counter++;
     });
   }
@@ -117,38 +96,34 @@ class _MyHomePageState extends State<MyHomePage> {
     )..load();
   }
 
+  List<Widget> _appBarActions() {
+    final adInspectorMenuItem = AppBarItem(AppBarItem.adInpsectorText, 0);
+
+    return <Widget>[
+      PopupMenuButton<AppBarItem>(
+          itemBuilder: (BuildContext context) => <PopupMenuEntry<AppBarItem>>[
+                PopupMenuItem<AppBarItem>(
+                  value: adInspectorMenuItem,
+                  child: Text(adInspectorMenuItem.label),
+                ),
+              ],
+          onSelected: (item) {
+            MobileAds.instance.openAdInspector((error) {
+              // Error will be non-null if ad inspector closed due to an error.
+            });
+          })
+    ];
+  }
+
   @override
   Widget build(BuildContext context) {
-    // This method is rerun every time setState is called, for instance as done
-    // by the _incrementCounter method above.
-    //
-    // The Flutter framework has been optimized to make rerunning build methods
-    // fast, so that you can just rebuild anything that needs updating rather
-    // than having to individually change instances of widgets.
     return Scaffold(
       appBar: AppBar(
-        // Here we take the value from the MyHomePage object that was created by
-        // the App.build method, and use it to set our appbar title.
         title: Text(widget.title),
+        actions: _appBarActions(),
       ),
       body: Center(
-        // Center is a layout widget. It takes a single child and positions it
-        // in the middle of the parent.
         child: Column(
-          // Column is also a layout widget. It takes a list of children and
-          // arranges them vertically. By default, it sizes itself to fit its
-          // children horizontally, and tries to be as tall as its parent.
-          //
-          // Invoke "debug painting" (press "p" in the console, choose the
-          // "Toggle Debug Paint" action from the Flutter Inspector in Android
-          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
-          // to see the wireframe for each widget.
-          //
-          // Column has various properties to control how it sizes itself and
-          // how it positions its children. Here we use mainAxisAlignment to
-          // center the children vertically; the main axis here is the vertical
-          // axis because Columns are vertical (the cross axis would be
-          // horizontal).
           mainAxisAlignment: MainAxisAlignment.center,
           children: <Widget>[
             Text(
@@ -172,7 +147,7 @@ class _MyHomePageState extends State<MyHomePage> {
         onPressed: _incrementCounter,
         tooltip: 'Increment',
         child: Icon(Icons.add),
-      ), // This trailing comma makes auto-formatting nicer for build methods.
+      ),
     );
   }
 }

samples/admob/mediation_example/pubspec.yaml

@@ -18,7 +18,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: '>=3.2.0 <4.0.0'
 
 dependencies:
   flutter: