Dart Flutter连续firebase_auth错误

我的目标是使登录系统与电子邮件和密码与Firebase认证。为此，我安装了firebase_auth包，并设置所有Firebase设置。
当我运行firebase_auth已安装项目时，我收到了许多类似以下的错误：

The plugin `firebase_auth` uses a deprecated version of the Android embedding.
To avoid unexpected runtime failures, or future build failures, try to see if this plugin supports the Android V2 embedding. Otherwise, consider removing it since a future release of Flutter will remove these deprecated APIs.
If you are plugin author, take a look at the docs for migrating the plugin to the V2 embedding: https://flutter.dev/go/android-plugin-migration.
Launching lib\main.dart on Android SDK built for x86 in debug mode...
C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.6.2+1\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:8: error: package android.support.annotation does not exist
import android.support.annotation.NonNull;
                                 ^
C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.6.2+1\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:538: error: cannot find symbol

    public void onComplete(@NonNull Task<AuthResult> task) {
                            ^
  symbol:   class NonNull
  location: class FirebaseAuthPlugin.SignInCompleteListener
C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.6.2+1\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:558: error: cannot find symbol
    public void onComplete(@NonNull Task<Void> task) {

                            ^
  symbol:   class NonNull
  location: class FirebaseAuthPlugin.TaskVoidCompleteListener
C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.6.2+1\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:576: error: cannot find symbol
    public void onComplete(@NonNull Task<ProviderQueryResult> task) {
                            ^

  symbol:   class NonNull
  location: class FirebaseAuthPlugin.ProvidersCompleteListener
C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.6.2+1\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:175: error: cannot find symbol

                      public void onComplete(@NonNull Task<AuthResult> task) {
                                              ^
  symbol: class NonNull
C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.6.2+1\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:270: error: cannot find symbol
          public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                                          ^
  symbol: class NonNull
C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.6.2+1\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:435: error: cannot find symbol
              public void onComplete(@NonNull Task<GetTokenResult> task) {

                                      ^
  symbol: class NonNull
C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.6.2+1\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java:487: error: cannot find symbol
          public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                                          ^
  symbol: class NonNull
Note: C:\src\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_auth-0.6.2+1\android\src\main\java\io\flutter\plugins\firebaseauth\FirebaseAuthPlugin.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
8 errors

FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':firebase_auth:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org

BU�LD FAILED in 20s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

pubspec.yaml:

name: simto_todolist
description: A new Flutter project.
publish_to: 'none'
version: 1.0.0+1

module:
  androidX: true

environment:
  sdk: '>=2.7.0 <3.0.0'

dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^1.0.2

dev_dependencies:
  flutter_test:
    sdk: flutter
  global_configuration: ^1.6.0
  flutter_lints: ^1.0.0
  get_storage: ^2.0.3
  carousel_slider: ^4.0.0
  cool_alert: ^1.1.0
  timer_count_down: ^2.2.1
  modal_bottom_sheet: ^2.0.1
  persistent_bottom_nav_bar: ^4.0.2
  group_button: ^4.6.0
  flutter_signin_button: ^2.0.0
  google_sign_in: ^5.2.4
  firebase_core: ^1.13.1
  firebase_auth: ^0.6.2+1

flutter:
  uses-material-design: true
  assets:
  - splash1.png
  - splash2.png
  - splash3.png
  - splash4.png
  - logo.png
  
  fonts:
  - family: Roboto
    fonts:
    - asset: fonts/Roboto-Bold.ttf
    - asset: fonts/Roboto-Light.ttf
    - asset: fonts/Roboto-Medium.ttf
    - asset: fonts/Roboto-Thin.ttf

android/build.gradle:

buildscript {
    ext.kotlin_version = '1.6.10'
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:4.1.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.10'
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

android/app/build.gradle:

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'com.google.gms.google-services'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion flutter.compileSdkVersion

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        applicationId "io.simto.todolist.app"
        minSdkVersion 23
        targetSdkVersion flutter.targetSdkVersion
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation 'com.google.firebase:firebase-analytics-ktx'
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.google.firebase:firebase-analytics-ktx'
}

今天我已经处理这个错误几乎一整天了，我快疯了。我该如何修复这些重叠的错误呢？非常感谢你的帮助。

Dart Flutter连续firebase_auth错误

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