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AGPBI: {
   "kind":"error","text":"Program type already present: android.support.v4.app.INotificationSideChannel$Stub$Proxy","sources":[{
   }],"tool":"D8"}:app:transformDexArchiveWithExternalLibsDexMergerForDevDebug FAILEDFAILURE: Build failed with an exception.* What went wrong:Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDevDebug'.> com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: D:\demo_retrofit\RxHttpUtils-2.x\app\build\intermediates\transforms\dexBuilder\dev\debug\0.jar, D:\demo_retrofit\RxHttpUtils-2.x\app\build\intermediates\transforms\dexBuilder\dev\debug\1.jar, D:\demo_retrofit\RxHttpUtils-  Learn how to resolve the issue at https://developer.android.com/studio/build/dependencies#duplicate_classes.  Program type already present: android.support.v4.app.INotificationSideChannel$Stub$Proxy* Try:Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.* Get more help at https://help.gradle.orgBUILD FAILED in 18s

原因1：包冲突

android.enableJetifier=trueandroid.useAndroidX=true

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