Android Gradle库“无法解决”

Question

I'm trying to coax a number of android libraries to play nicely together but I'm becoming frustrated with the versioning system.

I've managed to get the firebase version of crashlytics working but I cannot currently get this to work well with admob:

in my app 'build.gradle' I have the following dependency section:

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')    
    implementation 'com.google.firebase:firebase-core:16.0.1'
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'    
    implementation 'com.crashlytics.sdk.android:crashlytics-ndk:2.0.5'
    implementation 'com.crashlytics.sdk.android:crashlytics:2.9.6'
    implementation 'com.google.android.gms:play-services-ads:16.0.1'    
}

Which produces this error:

Failed to resolve: com.google.android.gms:play-services-ads:16.0.1

'16.0.4' also fails whereas '17.1.1' produces this error:

The following dependencies are project dependencies that are direct or have transitive dependencies that lead to the art
ifact with the issue.
-- Project 'app' depends onto com.google.firebase:firebase-core@16.0.1
-- Project 'app' depends onto com.google.android.gms:play-services-ads@17.1.1

thinking that maybe all of the dependencies need to be '17.1.1' results in gradle not finding 'com.google.firebase:firebase-core:17.1.1'

I doubt I'm alone in finding this version soup somewhat opaque. Is there an easier way to ensure a set of libraries that work well together?

Answer 1

Add:

 implementation 'com.google.firebase:firebase-core:16.0.4'
 implementation 'com.google.android.gms:play-services-ads:17.1.1'

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

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

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:3.2.1'
  classpath 'com.google.gms:google-services:4.0.2'
   }
}

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

Answer 2

Please use the following version:

implementation 'com.google.android.gms:play-services-ads:17.1.1'

Also update the firebase-core library to version 16.0.4 :

implementation 'com.google.firebase:firebase-core:16.0.4'