0. 環境

[Gradle] 5.6.4

1. 問題

こちらの情報を元にFabricからFirebaseへの移行を行いました。

Android プロジェクトに Firebase を追加する

Upgrade to the Firebase Crashlytics SDK

コード修正後、エラーが発生してビルドできず・・・

Duplicate class com.google.android.gms.measurement.AppMeasurement found in modules jetified-firebase-analytics-impl-12.0.1-runtime.jar (com.google.firebase:firebase-analytics-impl:12.0.1) and jetified-play-services-measurement-impl-17.4.3-runtime.jar (com.google.android.gms:play-services-measurement-impl:17.4.3)
Duplicate class com.google.android.gms.measurement.AppMeasurement$ConditionalUserProperty found in modules jetified-firebase-analytics-impl-12.0.1-runtime.jar (com.google.firebase:firebase-analytics-impl:12.0.1) and jetified-play-services-measurement-impl-17.4.3-runtime.jar (com.google.android.gms:play-services-measurement-impl:17.4.3)
Duplicate class com.google.android.gms.measurement.AppMeasurement$Event found in modules jetified-firebase-analytics-impl-12.0.1-runtime.jar (com.google.firebase:firebase-analytics-impl:12.0.1) and jetified-play-services-measurement-impl-17.4.3-runtime.jar (com.google.android.gms:play-services-measurement-impl:17.4.3)
Duplicate class com.google.android.gms.measurement.AppMeasurement$EventInterceptor found in modules jetified-firebase-analytics-impl-12.0.1-runtime.jar (com.google.firebase:firebase-analytics-impl:12.0.1) and jetified-play-services-measurement-impl-17.4.3-runtime.jar (com.google.android.gms:play-services-measurement-impl:17.4.3)
Duplicate class com.google.android.gms.measurement.AppMeasurement$OnEventListener found in modules jetified-firebase-analytics-impl-12.0.1-runtime.jar (com.google.firebase:firebase-analytics-impl:12.0.1) and jetified-play-services-measurement-impl-17.4.3-runtime.jar (com.google.android.gms:play-services-measurement-impl:17.4.3)
Duplicate class com.google.android.gms.measurement.AppMeasurement$Param found in modules jetified-firebase-analytics-impl-12.0.1-runtime.jar (com.google.firebase:firebase-analytics-impl:12.0.1) and jetified-play-services-measurement-impl-17.4.3-runtime.jar (com.google.android.gms:play-services-measurement-impl:17.4.3)
Duplicate class com.google.android.gms.measurement.AppMeasurement$UserProperty found in modules jetified-firebase-analytics-impl-12.0.1-runtime.jar (com.google.firebase:firebase-analytics-impl:12.0.1) and jetified-play-services-measurement-impl-17.4.3-runtime.jar (com.google.android.gms:play-services-measurement-impl:17.4.3)
Duplicate class com.google.firebase.analytics.FirebaseAnalytics found in modules jetified-firebase-analytics-impl-12.0.1-runtime.jar (com.google.firebase:firebase-analytics-impl:12.0.1) and jetified-play-services-measurement-api-17.4.3-runtime.jar (com.google.android.gms:play-services-measurement-api:17.4.3)
Duplicate class com.google.firebase.analytics.FirebaseAnalytics$Event found in modules jetified-firebase-analytics-impl-12.0.1-runtime.jar (com.google.firebase:firebase-analytics-impl:12.0.1) and jetified-play-services-measurement-api-17.4.3-runtime.jar (com.google.android.gms:play-services-measurement-api:17.4.3)
Duplicate class com.google.firebase.analytics.FirebaseAnalytics$Param found in modules jetified-firebase-analytics-impl-12.0.1-runtime.jar (com.google.firebase:firebase-analytics-impl:12.0.1) and jetified-play-services-measurement-api-17.4.3-runtime.jar (com.google.android.gms:play-services-measurement-api:17.4.3)
Duplicate class com.google.firebase.analytics.FirebaseAnalytics$UserProperty found in modules jetified-firebase-analytics-impl-12.0.1-runtime.jar (com.google.firebase:firebase-analytics-impl:12.0.1) and jetified-play-services-measurement-api-17.4.3-runtime.jar (com.google.android.gms:play-services-measurement-api:17.4.3)

Go to the documentation to learn how to Fix dependency resolution errors.

2. 解決

エラーは「com.google.firebase:firebase-analyticsとcom.google.android.gms:play-servicesに含まれているjarがかぶってるよ」という内容に見えます。

Firebase移行で足した下記(a)を削除したらビルドが通るようになりました。

  • [アプリルート]/mobile/build.gradle

    dependencies {
    ...
        
    //(a)
    //implementation 'com.google.firebase:firebase-analytics:17.4.3'

    //(b)
    implementation 'com.google.android.gms:play-services:12.0.1'

    ...
}

こちらのリンクを見ると(b)のパッケージにはfirebase-analyticsが含まれているため、(a)と衝突してしまったと思われます。

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