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Solution when Duplicate class error occurs in android

Duplicate class android.support.v4.app.INotificationSideChannel found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
Duplicate class android.support.v4.app.INotificationSideChannel$Stub found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
Duplicate class android.support.v4.app.INotificationSideChannel$Stub$Proxy found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
Duplicate class android.support.v4.os.IResultReceiver found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
Duplicate class android.support.v4.os.IResultReceiver$Stub found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
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-27.1.1-runtime (com.android.support:support-compat:27.1.1)
Duplicate class android.support.v4.os.ResultReceiver found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
Duplicate class android.support.v4.os.ResultReceiver$1 found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
Duplicate class android.support.v4.os.ResultReceiver$MyResultReceiver found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.1.1-runtime (com.android.support:support-compat:27.1.1)
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-27.1.1-runtime (com.android.support:support-compat:27.1.1)
 
 
 
 
> 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$Stub found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.0.1-runtime (com.android.support:support-compat:27.0.1)
     Duplicate class android.support.v4.app.INotificationSideChannel$Stub$Proxy found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.0.1-runtime (com.android.support:support-compat:27.0.1)
     Duplicate class android.support.v4.os.IResultReceiver found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.0.1-runtime (com.android.support:support-compat:27.0.1)
     Duplicate class android.support.v4.os.IResultReceiver$Stub found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.0.1-runtime (com.android.support:support-compat:27.0.1)
     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-27.0.1-runtime (com.android.support:support-compat:27.0.1)
     Duplicate class android.support.v4.os.ResultReceiver found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.0.1-runtime (com.android.support:support-compat:27.0.1)
     Duplicate class android.support.v4.os.ResultReceiver$1 found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.0.1-runtime (com.android.support:support-compat:27.0.1)
     Duplicate class android.support.v4.os.ResultReceiver$MyResultReceiver found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.0.1-runtime (com.android.support:support-compat:27.0.1)
     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-27.0.1-runtime (com.android.support:support-compat:27.0.1)

**When errors like the above appear, remember: Open the gradle.properties file **

1.png

Add the last line of code "android.enableJetifier=true" like I did

You can choose to copy my title directly and sync it and it will be ok.

Why is an error reported? Why can this be solved? Configuring android.useAndroidX and android.enableJetifier in gradle enables the application's dependence on the support library to be automatically converted to dependence on androidx.

android.useAndroidX=true means "the Android plug-in will use the corresponding AndroidX library instead of the Support library";

Defaults to false when not set;

android.enableJetifier=true indicates that the Android plug-in will automatically migrate existing third-party libraries to use AndroidX dependencies by rewriting their binaries ; defaults to false when not set;

To sum up, it is

useAndroidX just uses the androidx library without support

enableJetfilter is the function of migrating third-party libraries androidX dependencies

Because you want to use things in the androidX library, you need to use enableJetfilter to migrate his library to adapt to yours.