Duplicate Class error when adding com.google.android.gms:play-services-ads:22.0.0

[Abhishek Pundir]

Hi Everyone, 

I was trying to add the google admob dependency in the project 

( com.google.android.gms:play-services-ads:22.0.0) but getting 

Duplicate class com.google.android.gms.internal.measurement.zzbu 

found in modules jetified-play-services-measurement-17.4.3-runtime 

(com.google.android.gms:play-services-measurement:17.4.3) and 

jetified-play-services-measurement-sdk-api-20.1.2-runtime 

(com.google.android.gms:play-services-measurement-sdk-api:20.1.2) exception, 

I think this is getting logged as i am using com.google.firebase:firebase-core:17.4.3

as it is also adding com.google.android.gms internally which has a different version which gets imported by play-services-ads 

 

Does anyone knows how to resolve this?

[Mobile Ads SDK Forum Advisor]

Hello Abhishek,

Thank you for reaching out to us.

For us to properly troubleshoot your issue, kindly provide us the following information below privately:

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[Abhishek Pundir]

Sharing the link of the apk uploaded to github : https://github.com/pundirAbhishek/GoogleAdsIssueApp

Steps to replicate: 

Just compile the project and you will see the compile time error mentioned above. 

[Mobile Ads SDK Forum Advisor]

Hello Abhishek,

Thank you for the information.

To fix this issue, simply add this to your dependencies in your build.gradle: implementation platform('com.google.firebase:firebase-bom:30.1.0'). Feel free to reach back to us if you have any further inquiries or concerns.

[Abhishek Pundir]

Hi 

Thanks for the quick response but i have a couple of queries on this

1. Couldn't find a documentation regarding the same on why we would require to add this dependency. 

2. As per the documentation of the firebase-bom, it will keep the versions of all firebase libraries imported in sync, but as i am using a lot of individual firebase dependencies in my app, wouldn't this update those libraries version and create an issue at production?

[Mobile Ads SDK Forum Advisor]

Hello Abhishek,

With regards to your inquiry, the Firebase Android BoM (Bill of Materials) enables you to manage all your Firebase library versions by specifying only one version — the BoM's version.

When you use the Firebase BoM in your app, the BoM automatically pulls in the individual library versions mapped to BoM's version. All the individual library versions will be compatible. When you update the BoM's version in your app, all the Firebase libraries that you use in your app will update to the versions mapped to that BoM version.

The BoM acts like a sort of manifest for all your Firebase libraries. This prevents Duplicate Class error you encountered. This will not cause problems to those libraries version and create an issue at production. You can read more in this documentation for more information (https://firebase.google.com/docs/android/learn-more#bom)