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com.android.dex.DexException: Multiple dex files define Lorg/androidpn/demoapp/BuildConfig

先说下本项目中导致此问题的步骤，创建一个Library父项目，之后创建依赖此项目的子项目，之后将Library父项目打成jar，放入子项目中，删除Library父项目的所有代码，将打成的jar放入子项目中,clean 成功，build失败。

- 以下是完整报错日志

Executing tasks: [:androidpush:assembleDebug]

Configuration on demand is an incubating feature.
Incremental java compilation is an incubating feature.
:preBuild UP-TO-DATE
:preReleaseBuild UP-TO-DATE
:checkReleaseManifest
:prepareReleaseDependencies
:compileReleaseAidl UP-TO-DATE
:compileReleaseNdk UP-TO-DATE
:compileLint UP-TO-DATE
:copyReleaseLint UP-TO-DATE
:mergeReleaseShaders UP-TO-DATE
:compileReleaseShaders UP-TO-DATE
:generateReleaseAssets UP-TO-DATE
:mergeReleaseAssets UP-TO-DATE
:mergeReleaseProguardFiles UP-TO-DATE
:packageReleaseRenderscript UP-TO-DATE
:compileReleaseRenderscript UP-TO-DATE
:generateReleaseResValues UP-TO-DATE
:generateReleaseResources UP-TO-DATE
:packageReleaseResources UP-TO-DATE
:processReleaseManifest
:generateReleaseBuildConfig
:processReleaseResources
:generateReleaseSources
:incrementalReleaseJavaCompilationSafeguard
:javaPreCompileRelease
:compileReleaseJavaWithJavac
:processReleaseJavaRes UP-TO-DATE
:transformResourcesWithMergeJavaResForRelease UP-TO-DATE
:transformClassesAndResourcesWithSyncLibJarsForRelease
:mergeReleaseJniLibFolders UP-TO-DATE
:transformNativeLibsWithMergeJniLibsForRelease UP-TO-DATE
:transformNativeLibsWithStripDebugSymbolForRelease UP-TO-DATE
:transformNativeLibsWithSyncJniLibsForRelease UP-TO-DATE
:bundleRelease
:androidpush:preBuild UP-TO-DATE
:androidpush:preDebugBuild UP-TO-DATE
:androidpush:checkDebugManifest
:androidpush:preReleaseBuild UP-TO-DATE
:androidpush:prepareComAfollestadMaterialDialogsCore0902Library
:androidpush:prepareComAndroidSupportAnimatedVectorDrawable2421Library
:androidpush:prepareComAndroidSupportAppcompatV72421Library
:androidpush:prepareComAndroidSupportCardviewV72340Library
:androidpush:prepareComAndroidSupportDesign2340Library
:androidpush:prepareComAndroidSupportRecyclerviewV72421Library
:androidpush:prepareComAndroidSupportSupportCompat2421Library
:androidpush:prepareComAndroidSupportSupportCoreUi2421Library
:androidpush:prepareComAndroidSupportSupportCoreUtils2421Library
:androidpush:prepareComAndroidSupportSupportFragment2421Library
:androidpush:prepareComAndroidSupportSupportMediaCompat2421Library
:androidpush:prepareComAndroidSupportSupportV42421Library
:androidpush:prepareComAndroidSupportSupportVectorDrawable2421Library
:androidpush:prepareComDaimajiaAndroidanimationsLibrary113Library
:androidpush:prepareComDaimajiaEasingLibrary101Library
:androidpush:prepareComGithubChaossssBadgedView111Library
:androidpush:prepareComGithubClansFab164Library
:androidpush:prepareComWdullaerMaterialdatetimepicker250Library
:androidpush:prepareComZzhoujayMarkdownMarkdown100Library
:androidpush:prepareComZzhoujayRichtextRichtext211Library
:androidpush:prepareMeZhanghaiAndroidMaterialprogressbarLibrary117Library
:androidpush:prepareDebugDependencies
:androidpush:compileDebugAidl UP-TO-DATE
:androidpush:compileDebugRenderscript UP-TO-DATE
:androidpush:generateDebugBuildConfig UP-TO-DATE
:androidpush:generateDebugResValues UP-TO-DATE
:androidpush:generateDebugResources UP-TO-DATE
:androidpush:mergeDebugResources UP-TO-DATE
:androidpush:processDebugManifest
:androidpush:processDebugResources
:androidpush:generateDebugSources
:androidpush:incrementalDebugJavaCompilationSafeguard
:androidpush:javaPreCompileDebug
:androidpush:compileDebugJavaWithJavac
:androidpush:compileDebugJavaWithJavac - is not incremental (e.g. outputs have changed, no previous execution, etc.).
:androidpush:compileDebugNdk UP-TO-DATE
:androidpush:compileDebugSources
:androidpush:mergeDebugShaders UP-TO-DATE
:androidpush:compileDebugShaders UP-TO-DATE
:androidpush:generateDebugAssets UP-TO-DATE
:androidpush:mergeDebugAssets UP-TO-DATE
:androidpush:transformClassesWithDexForDebug FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':androidpush:transformClassesWithDexForDebug'.
> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.dex.DexException: Multiple dex files define Lorg/androidpn/demoapp/BuildConfig;

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 2.966 secs

- 经分析，是BuildConfig重复导致，但是清除Library父项目的BuildConfig或者更改Library父项目的build.gradle中config配置都试过，没用，想到只要这样使用肯定会出现BuildConfig重复，所以修改Library父项目的包名，这样就可以绕过解决这个问题

• 第一篇博客，审美有偏差，markdown用的不熟练，望指正。