[flutter]flutter_admobが非推奨になったのでgoogle_mobile_adsに移行する

dependencies:
  firebase_admob ←削除
  google_mobile_ads: ^0.12.1 ←追加

environment:
  sdk: ">=2.12.0 <3.0.0"

pub get failed (1; So, because app depends on both
flutter_localizations any from sdk and firebase_auth ^0.18.3, version
solving failed.)

Because firebase_auth >=1.0.2 depends on firebase_core ^1.0.3 and lett depends on firebase_core ^0.5.2, firebase_auth >=1.0.2 is forbidden.

  firebase_core: ^1.0.3
  firebase_auth: ^1.0.2
  google_mobile_ads: ^0.12.1
  flutter_twitter: ^1.1.3
  firebase_analytics: ^7.1.1
  firebase_messaging: ^9.1.1
  firebase_storage: ^8.0.2
  image_picker: ^0.7.4

  InterstitialAd? interstitialAd;
  interstitialAd = InterstitialAd(
        adUnitId: adUnitId,
        request: AdRequest(),
        listener: AdListener(onAdLoaded: (ad) async {
          SystemChrome.setEnabledSystemUIOverlays([]);
          if (interstitialAd != null) {
            await interstitialAd!.show();
            interstitialAd = null;
          }
        }, onAdClosed: (ad) {
          SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values);
        }, onAdFailedToLoad: (ad, error) {
        }),
      );
  await interstitialAd!.load();

Warning: CocoaPods recommended version 1.10.0 or greater not installed.
Pods handling may fail on some projects involving plugins.
To upgrade see https://guides.cocoapods.org/using/getting-started.html#installation for instructions.

CocoaPods 1.10.1 is available.
To update use: `gem install cocoapods`

ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.6.0 directory.

sudo gem install -n /usr/local/bin cocoapods

~~~~~~~ Debug-iphonesimulator/App.framework" failed: No such file or directory (2)
done

            "type": "dart",
            "args": [
                "--no-sound-null-safety" //追加

The build failed likely due to AndroidX incompatibilities in a plugin. The tool is about to try using Jetifier to solve the incompatibility.
[!] Flutter tried to create the file `android/settings_aar.gradle`, but failed.
To manually update `settings.gradle`, follow these steps:
    1. Copy `settings.gradle` as `settings_aar.gradle`
    2. Remove the following code from `settings_aar.gradle`:
        def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
        def properties = new Properties()
        assert localPropertiesFile.exists()
        localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) }
        def flutterSdkPath = properties.getProperty("flutter.sdk")
        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
        apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"

classpath 'com.android.tools.build:gradle:4.1.0'

 Minimum supported Gradle version is 6.5. Current version is 5.6.2. If using the gradle wrapper, try editing the distributionUrl in /Users/yuya/FlutterProjects/lett/android/gradle/wrapper/gradle-wrapper.properties to gradle-6.5-all.zip

distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip

package アプリ名
import io.flutter.app.FlutterApplication
import io.flutter.plugin.common.PluginRegistry

import io.flutter.plugins.firebase.messaging.FlutterFirebaseMessagingPlugin

class Application() : FlutterApplication(), PluginRegistry.PluginRegistrantCallback {
  override fun registerWith(registry: PluginRegistry?) {
      val key: String? = FlutterFirebaseMessagingPlugin::class.java.canonicalName
      if (!registry?.hasPlugin(key)!!) {
          FlutterFirebaseMessagingPlugin.registerWith(registry?.registrarFor("io.flutter.plugins.firebase.messaging.FlutterFirebaseMessagingPlugin"));
        }
    }
}

android{
    compileSdkVersion 30 //変更
    ......
    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "app.name"
        minSdkVersion 23  //変更
        targetSdkVersion 30 //変更
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }
}

flutter clean
flutter pub cathe repair
flutter pub get