Android 的报错具体内容如下
> 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-27.0.1-runtime (com.android.support:support-compat:27.0.1)
Duplicate class android.support.v4.app.INotificationSideChannel$Stub found in modules core-1.7.0-runtime (androidx.core:core:1.7.0) and support-compat-27.0.1-runtime (com.android.support:support-compat:27.0.1)
Duplicate class android.support.v4.app.INotificationSideChannel$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)
* Try:
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
解决办法：在gradle.properties中插入"android.enableJetifier=true"
完整的代码文件如下
