添加Firebase Messenger后出现Google Services插件版本冲突求助

Hey there, let's get that Firebase version conflict sorted out for you!

What's causing the issue? #

The error message is pointing out a mismatch between your google-services plugin version and the Firebase dependencies you're using. Your project is running com.google.gms:google-services:3.2.1 (a relatively old version) alongside Firebase libraries at version 11.8.0—these two don't play nicely together. The plugin needs an update to support the newer Firebase versions.

How to fix it #

Here's the step-by-step solution:

1. Update the google-services plugin in your project-level build.gradle
   Open your top-level build.gradle file and replace the old plugin version with one compatible with Firebase 11.8.0. A safe, fully compatible choice here is version 4.3.10:

   buildscript {
       repositories {
           jcenter()
           google()
           maven { url 'https://maven.fabric.io/public' }
       }
       dependencies {
           classpath 'com.android.tools.build:gradle:3.1.2'
           classpath 'com.google.gms:google-services:4.3.10' // Updated this line
           classpath 'io.fabric.tools:gradle:1.25.1'
           classpath 'com.google.firebase:firebase-plugins:1.1.5'
       }
   }
   

2. Double-check your Firebase dependency consistency
   Great news—you already have all your Firebase libraries set to 11.8.0, which is perfect. Keeping all Firebase/Google Play Services dependencies on the same version is critical to avoid these conflicts, so no changes needed here.

3. Confirm plugin placement
   You already have apply plugin: 'com.google.gms.google-services' at the very bottom of your app-level build.gradle, which is the correct position (it needs to come after all your dependencies are declared). No adjustments required here either!

Final steps #

After making these changes, sync your Gradle project and rebuild it. The version conflict error should disappear.

If you run into similar issues later, remember: the google-services plugin version must match the compatibility of your Firebase/Google Play Services libraries. Updating the plugin is almost always better than downgrading Firebase libraries (since you’ll keep access to new features and bug fixes).

内容的提问来源于stack exchange，提问作者ZeroKat