Java 升级安卓版本后获得；重复类android.support.v4.app.INotificationSideChannel“；

在android update 3.4之前，我的应用程序运行良好，但在升级android之后，我的应用程序出现合并错误：

"Duplicate class android.support.v4.app.INotificationSideChannel"

android update 3.4
upgrade gradle 5.1.1 
upgrade sdk

Error:
    Duplicate class android.support.v4.app.INotificationSideChannel found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class android.support.v4.app.INotificationSideChannel$Stub found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class android.support.v4.app.INotificationSideChannel$Stub$Proxy found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class android.support.v4.graphics.drawable.IconCompatParcelizer found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class android.support.v4.os.IResultReceiver found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class android.support.v4.os.IResultReceiver$Stub found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class android.support.v4.os.IResultReceiver$Stub$Proxy found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class android.support.v4.os.ResultReceiver found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class android.support.v4.os.ResultReceiver$1 found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class android.support.v4.os.ResultReceiver$MyResultReceiver found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class android.support.v4.os.ResultReceiver$MyRunnable found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class androidx.core.graphics.drawable.IconCompatParcelizer found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class androidx.core.internal.package-info found in modules classes.jar (androidx.core:core:1.0.0) and classes.jar (com.android.support:support-compat:28.0.0)
    Duplicate class androidx.versionedparcelable.CustomVersionedParcelable found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.NonParcelField found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.ParcelField found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.ParcelImpl found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.ParcelImpl$1 found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.ParcelUtils found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.VersionedParcel found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.VersionedParcel$1 found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.VersionedParcel$ParcelException found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.VersionedParcelParcel found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.VersionedParcelStream found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.VersionedParcelStream$FieldBuffer found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.VersionedParcelStream$InputBuffer found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.VersionedParcelable found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)
    Duplicate class androidx.versionedparcelable.VersionedParcelize found in modules classes.jar (androidx.versionedparcelable:versionedparcelable:1.0.0) and classes.jar (com.android.support:versionedparcelable:28.0.0)

Go to the documentation to learn how to Fix dependency resolution errors.

------------------依赖性------------

---

您的

androidx

库（可能在一个使用过的库中）与

支持

库冲突

将这些行添加到

gradle.properties

文件中：（它位于项目的根目录中）

Jetifier工具将依赖于支持库的库迁移为依赖于等效的AndroidX包。

为什么会发生这种情况？ 因为升级后，

androidx.core:core

会在某个地方被访问，而您的项目仍然没有使用androidx。因此像

INotificationSideChannel

和其他许多类现在可以在两个地方找到-

androidx.core:core

和

com.android.support:support compat

。这就是发生此错误的原因

解决方案 您需要迁移到AndroidX，您应该已经这样做了。如果你不知道AndroidX。请阅读

如何迁移当前项目 在Android Studio 3.2（2018年9月）中，可以直接选择将现有项目迁移到

AndroidX

。这将自动折射所有包

迁移之前，强烈建议备份项目。

现有项目

• Android Studio>重构菜单>迁移到AndroidX
• 它将分析并打开底部的折射器窗口。接受要做的更改

新项目 将这些标志放入您的

gradle.properties

android.enableJetifier=true
android.useAndroidX=true

检查@

---

选中@

首先从顶部栏中选择折射器，然后从该栏中选择折射到androidx，这样它将为您创建一个zip文件，作为备份

之后，它会自动恢复正常，并修复所有阻止手机应用程序运行的bug和错误

---

就这样！！你做到了

我们可以在你的

build.gradle

文件中看到你的

依赖项吗。您可能同时拥有
androidx
库和
com.android.support
库，它们之间存在冲突Sure@user3170251，我在这里更新依赖项，现在您可以看到我的项目依赖项这并没有解决我的问题。还有其他选择吗？你找到解决方案了吗？我也有这个问题。我刚刚将gradle版本从2.3升级到3.4.1。我的应用程序中没有使用或集成androidx。有其他解决方案吗？@civanimahida你确定，您没有使用任何第三方库，如firebase，它正在使用androidx？谢谢，我使用了firebase，当我删除它时，我没有再收到重复错误。谢谢，我认为这是唯一的解决方案，尽管我试图避免它，因为我对androidx没有任何想法。
android.useAndroidX=true
android.enableJetifier=true

android.enableJetifier=true
android.useAndroidX=true