android - How can I fix the duplicate class errors I get when using react-native-splash-screen? - Stack Overflow

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After I "yarn add react-native-splash-screen", when I run 'yarn android' my app fails to build and I get this set of errors:

   > Duplicate class android.support.v4.app.INotificationSideChannel found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.app.INotificationSideChannel$Stub found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.app.INotificationSideChannel$Stub$Proxy found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.os.IResultReceiver found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.os.IResultReceiver$Stub found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> 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-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> 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-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.os.ResultReceiver$1 found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.os.ResultReceiver$MyResultReceiver found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> 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-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)

How can I fix this and why does this happen?

After I "yarn add react-native-splash-screen", when I run 'yarn android' my app fails to build and I get this set of errors:

   > Duplicate class android.support.v4.app.INotificationSideChannel found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.app.INotificationSideChannel$Stub found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.app.INotificationSideChannel$Stub$Proxy found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.os.IResultReceiver found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.os.IResultReceiver$Stub found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> 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-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> 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-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.os.ResultReceiver$1 found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)
     Duplicate class android.support.v4.os.ResultReceiver$MyResultReceiver found in modules core-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> 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-1.9.0.aar -> core-1.9.0-runtime (androidx.core:core:1.9.0) and support-compat-26.1.0.aar -> support-compat-26.1.0-runtime (com.android.support:support-compat:26.1.0)

How can I fix this and why does this happen?

• android
• react-native
• splash-screen

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1 Answer 1

Sorted by: Reset to default 0

The error is caused by conflicting dependencies in the project. Specifically, androidx.core:core:1.9.0 and com.android.support:support-compat:26.1.0 are causing a conflict. This often happens when mixing androidx and android.support dependencies, which are incompatible.

Here's an example build.gradle (android level) to show how to fix it using resolutionStrategy: in the subprojects, just resolve the dependencies in favor of androidX.

buildscript {
    ext {
        buildToolsVersion = "35.0.0"
        minSdkVersion = 24
        compileSdkVersion = 35
        targetSdkVersion = 34
        ndkVersion = "26.1.10909125"
        kotlinVersion = "1.9.24"
    }
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath("com.android.tools.build:gradle")
        classpath("com.facebook.react:react-native-gradle-plugin")
        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin")
    }
 
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

subprojects {
    configurations.all {
        resolutionStrategy {
            force 'androidx.core:core:1.9.0'
            exclude group: 'com.android.support'
        }
    }
}

// React Native plugin
apply plugin: "com.facebook.react.rootproject"

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