无法解决:com.google.firebase:firebase-core:16.0.1

Question

我正在尝试将firebase云存储添加到我的应用程序中.下面是app build.gradle.但它说:无法解决:com.google.firebase:firebase-core:16.0.1.为什么？依赖项中根本没有firebase-core.

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.louise.udacity.mydict"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    implementation 'com.google.firebase:firebase-storage:16.0.1'
    implementation 'com.google.firebase:firebase-auth:16.0.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

    implementation 'com.google.cloud:google-cloud-storage:1.31.0'
    implementation 'com.firebase:firebase-jobdispatcher:0.8.5'
}

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

Answer 1

来自文档: -

您的应用程序gradle文件现在必须明确列出com.google.firebase:firebase-core作为Firebase服务的依赖项才能按预期工作.

加:

 implementation 'com.google.firebase:firebase-core:16.0.1'

在顶级gradle文件中使用最新版本的google play服务:

classpath 'com.google.gms:google-services:4.0.2'

https://firebase.google.com/support/release-notes/android

https://bintray.com/android/android-tools/com.google.gms.google-services

注意:

您需要google()在顶级gradle文件中添加repo,如firebase文档中所指定的那样,它应该在之前jcenter():

 buildscript {
  repositories {
          google()
          jcenter()
      }



dependencies {
  classpath 'com.android.tools.build:gradle:3.1.3'
  classpath 'com.google.gms:google-services:4.0.2'
   }
}

allprojects {
     repositories {
              google()
             jcenter()
  }
}

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

https://firebase.google.com/docs/android/setup

Answer 2

自2018年5月23日更新以来,当您使用firebase依赖项时,您也必须包含firebase-core依赖项.

如果添加它,您仍然有错误,尝试更新您gradle-wrapper.properties的4.5版本中的gradle插件:

distributionUrl=https\://services.gradle.org/distributions/gradle-4.5-all.zip

并重新同步项目.

Answer 3

我得到了同样的问题,我通过替换解决了它:

implementation 'com.google.firebase:firebase-core:16.0.1'

至

implementation 'com.google.firebase:firebase-core:15.0.2'

一切都解决了,运作良好.

Answer 4

将maven {url" https://maven.google.com "}添加到根级build.gradle文件中

repositories {
    maven { url "https://maven.google.com" }
    flatDir {
        dirs 'libs'
    }
}

Answer 5

正如@Peter Haddad所述，

为了解决此问题，我遵循了Google Firebase集成准则，并对我的app / build.gradle和project / build.gradle进行了以下更改

如果您有任何疑问，请点击以下提到的链接

https://firebase.google.com/docs/android/setup

app / build.gradle中的更改

implementation 'com.google.android.gms:play-services-base:15.0.2'
implementation "com.google.firebase:firebase-core:16.0.1"
implementation "com.google.firebase:firebase-messaging:17.4.0"

Project / build.gradle中的更改

repositories {

        google()
        jcenter()
        mavenCentral()
        maven {
            url 'https://maven.fabric.io/public'
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.4'
        classpath 'com.google.gms:google-services:4.2.0'// // google-services plugin it should be latest if you are using firebase version 16.0 +
       
    }
    allprojects {
    repositories {
         google()// add it to top instead of bottom or somewhere in middle
        mavenLocal()
        mavenCentral()
        maven {
            url 'https://maven.google.com'
        }
       
        jcenter()
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url "$rootDir/../node_modules/react-native/android"
        }
        
    }
}