Failed to resolve: com.google.firebase:firebase-core:16.0.1

问题

I\'m trying to add firebase cloud storage to my app. Below is the app build.gradle. But it says: Failed to resolve: com.google.firebase:firebase-core:16.0.1. Why? There is no firebase-core in the dependencies at all.

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\'

回答1:

From the docs:-

Your app gradle file now has to explicitly list com.google.firebase:firebase-core as a dependency for Firebase services to work as expected.

Add:

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

and in top level gradle file use the latest version of google play services:

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

Note:

You need to add the google() repo in the top level gradle file, as specified in the firebase docs and also it should be before 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

回答2:

Since May 23, 2018 update, when you're using a firebase dependency, you must include the firebase-core dependency, too.

If adding it, you still having the error, trying to update the gradle plugin in your gradle-wrapper.properties to 4.5 version:

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

and resync the project.

回答3:

Add maven { url "https://maven.google.com" } to your root level build.gradle file

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

回答4:

I get the same issue and i solved it by replacing :

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

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

and everything solved and worked well.

回答5:

As @Peter Haddad mentioned above,

To fix this issue I followed Google firebase integration guidelines and did the following changes in my app/build.gradle and project/build.gradle

Follow below mentioned link if you have any doubts

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

changes in app/build.gradle

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"

Changes in Project/build.gradle

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"
        }
        
    }
}

回答6:

I was able to solve the issue by following these steps-

1.) This error occurs when you didn't connect your project to firebase. Do that from Tools->Firebase if you are using Android studio version 2.2 or above.

2.) Make sure you have replaced the compile with implementation in dependencies in app/build.gradle

3.) Include your firebase dependency from the firebase docs. Everything should work fine now

回答7:

This is rare, but there is a chance your project's gradle offline mode is enable, disable offline mode with the following steps;

In android studio, locate the file tab of the header and click
In the drop own menu, select settings
In the dialog produced, select "Build, Execution, Deploy" and then select "Gradle"
Finally uncheck the "offline work" check box and apply changes

If this doesn't work leave a comment describing your Logcat response and i'll try to help more.

回答8:

What actually was missing for me and what made it work then was downloading'Google Play services' and 'Google Repository'

Go to: Settings -> Android SDK -> SDK Tools -> check/install Google Play services + repository

Hope it helps.

回答9:

In my case it was resolved by changing the compileSdkVersion and targetSdkVersion from 26 to 27

回答10:

If you use Firebase in a library module, you need to apply the google play services gradle plugin to it in addition to the app(s) module(s), but also, you need to beware of version 4.2.0 (and 4.1.0) which are broken, and use version 4.0.2 instead.

Here's the issue: https://github.com/google/play-services-plugins/issues/22

回答11:

if you are using

compileSdkVersion 23

in app-level gradle, and

classpath 'com.android.tools.build:gradle:2.1.0'

in project-level gradle and you have added the google-services.json file to your project.

you need to add just below code

maven {
   url "https://maven.google.com"
}

at below of jcenter() in repositories blocks in project-level gradle file here are my gradle files:

project-level gradle file:

buildscript {
    repositories {
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.0'
        classpath 'com.google.gms:google-services:4.0.1'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
}

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

and app-level gradle file:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "com.example.moslem.amazonlikeapp"
        minSdkVersion 21
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.3.0'
    compile 'com.google.firebase:firebase-core:16.0.1'
}
apply plugin: 'com.google.gms.google-services'

回答12:

Just add below code and update all firebase versions that will work

 implementation 'com.google.firebase:firebase-core:17.2.0'

回答13:

If you receive an error stating the library cannot be found, check the Google maven repo for your library and version. I had a version suddenly disappear and make my builds fail.

https://maven.google.com/web/index.html

来源：https://stackoverflow.com/questions/50586177/failed-to-resolve-com-google-firebasefirebase-core16-0-1

标签

android

firebase

gradle

android-gradle-plugin

cloud-storage