如何修复使用Firestore和messaging的Flutter android项目的gradle错误

修复使用Firestore和messaging的Flutter android项目的gradle错误，可以按照以下步骤进行操作：

确保Firestore和messaging的依赖已正确添加到项目的pubspec.yaml文件中。例如：

dependencies:
  flutter:
    sdk: flutter
  cloud_firestore: ^2.5.0
  firebase_messaging: ^11.2.0

打开Flutter项目的Android目录，找到android/build.gradle文件，并确保以下内容：

buildscript {
    ext.kotlin_version = '1.5.31'
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:4.2.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.10' // 添加此行
    }
}

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
}

打开Flutter项目的Android目录，找到android/app/build.gradle文件，并确保以下内容：

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'com.google.gms.google-services' // 添加此行

android {
    compileSdkVersion 30

    defaultConfig {
        applicationId "your.application.id"
        minSdkVersion 21
        targetSdkVersion 30
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation 'androidx.appcompat:appcompat:1.3.1'
    implementation 'com.google.firebase:firebase-messaging:22.0.0' // 添加此行
}