에러핸들링 - Duplicate class android.support.v4.app.INotificationSideChannel found in modules

• :app:checkDebugDuplicateClasses
• Duplicate class android.support.v4.app.INotificationSideChannel found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
• Duplicate class android.support.v4.app.INotificationSideChannel found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)

> Task :app:checkDebugDuplicateClasses FAILED Execution failed for task ':app:checkDebugDuplicateClasses'. > A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable    > Duplicate class android.support.v4.app.INotificationSideChannel found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)      Duplicate class android.support.v4.app.INotificationSideChannel$Stub found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)      Duplicate class android.support.v4.app.INotificationSideChannel$Stub$Proxy found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)      Duplicate class android.support.v4.os.IResultReceiver found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)      Duplicate class android.support.v4.os.IResultReceiver$Stub found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)      Duplicate class android.support.v4.os.IResultReceiver$Stub$Proxy found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)      Duplicate class android.support.v4.os.ResultReceiver found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)      Duplicate class android.support.v4.os.ResultReceiver$1 found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)      Duplicate class android.support.v4.os.ResultReceiver$MyResultReceiver found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)      Duplicate class android.support.v4.os.ResultReceiver$MyRunnable found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)

dependencies 설정 하다 보면 위와 같은 에러를 만나기도 한다.

 

gradle.properties 파일에 아래 두 줄을 추가 하자.

 

android.useAndroidX=true
android.enableJetifier=true

android.userAndroidX : true 이면, Support Library 대신 AndroidX library를 사용하게된다. 추가 하지 않으면 기본 false.

android.enableJetifier : true 이면, Android plugin은 기존 서드파티 라이브러리 binary를 다시 작성해서 AndroidX 종속성을 사용하도록 자동으로 마이그레이션 한다. 추가 하지 않으면 기본은 false.