google-services:4.1.0似乎有一个问题。要么降级为

classpath 'com.google.gms:google-services:4.0.0'

或将其升级为

classpath 'com.google.gms:google-services:4.2.0'

dependencies {
    classpath 'com.android.tools.build:gradle:3.3.0-alpha08'
    classpath 'com.google.gms:google-services:4.2.0'
    /*classpath 'com.google.gms:google-services:4.1.0' <-- this was the problem */
}

希望能有所帮助

在我的例子中，我从我的一个项目中复制并粘贴了firebase依赖项。 所以，我的build.gradle(:app)有crashlytics依赖，但我没有在build.gradle(根)中添加crashlytics类路径。

验证你以这种方式添加了这些依赖项:

build.gradle(根):

// Top-level build file where you can add configuration options 
//  common to all sub-projects/modules.

buildscript {
    repositories {
        mavenCentral()
        google()
    }

    dependencies {
        classpath "com.android.tools.build:gradle:${project.GRADLE_VERSION}"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${project.KOTLIN_VERSION}"
        classpath "com.google.gms:google-services:4.3.14"
        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.9.2'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

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

build.gradle(应用):

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
    id 'com.google.gms.google-services'
    id 'com.google.firebase.crashlytics'

}

android {
  .......
  depencies {
      ........
    //firebase
    implementation platform("com.google.firebase:firebase-bom:31.1.1")
    implementation "com.google.firebase:firebase-crashlytics-ktx:18.3.2"
    implementation "com.google.firebase:firebase-analytics-ktx:21.2.0"
    implementation 'com.google.firebase:firebase-messaging-ktx:23.1.1'
    implementation 'com.google.firebase:firebase-config-ktx:21.2.0'
  }
}

去应用类或第一个稳定类(MainActivity):

// initialize firebase:
FirebaseApp.initializeApp(context)

我们必须在应用程序类的onCreate函数中初始化Firebase。

 package com.rocks.music.videoplayer;

 import android.app.Application;
 import android.content.Context;

 import com.google.firebase.FirebaseApp;


/**
* Created by ashish123 on 22/8/15.
  */
 public class MyApplication extends Application {

private static MyApplication mInstance;

@Override
public void onCreate() {
    super.onCreate();
    mInstance = this;
    try {
        FirebaseApp.initializeApp(this);
    }
    catch (Exception e) {
    }
}

public static Context getInstance() {
    return mInstance;
}

}

清单文件中的代码:-

  <application
    android:name="com.rocks.music.videoplayer.MyApplication"
    android:allowBackup="true"
    android:icon="@drawable/app_icon"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

我把项目gms:google_services降级为 类路径的com.google.gms:谷歌服务:4.0.1 这对我很管用。

我在我的app/build中漏掉了下面这一行。gradle文件

apply plugin: 'com.google.gms.google-services'

并且一旦清理项目并再次运行。这为我解决了问题。

    classpath 'com.google.gms:google-services:4.1.0'

有个问题。而不是使用:

    classpath 'com.google.gms:google-services:4.2.0'