ClassNotFoundException：在 androidx 迁移后未找到 class "android.support.v4.content.FileProvider"

Question

我正在尝试迁移到 androidx。我使用了 Android Studio 中的迁移工具。当我这样做时，我运行我的应用程序

得到以下堆栈跟踪

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.peerke.outdoorpuzzlegame.debug, PID: 10901
    java.lang.RuntimeException: Unable to get provider android.support.v4.content.FileProvider: java.lang.ClassNotFoundException: Didn't find class "android.support.v4.content.FileProvider" on path: DexPathList[[zip file "/data/app/com.peerke.outdoorpuzzlegame.debug-IBtFsngoLqc-cQb_hOO5wQ==/base.apk"],nativeLibraryDirectories=[/data/app/com.peerke.outdoorpuzzlegame.debug-IBtFsngoLqc-cQb_hOO5wQ==/lib/x86, /system/lib]]
        at android.app.ActivityThread.installProvider(ActivityThread.java:6376)
        at android.app.ActivityThread.installContentProviders(ActivityThread.java:5932)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5847)
        at android.app.ActivityThread.access00(ActivityThread.java:198)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1637)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6649)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:826)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v4.content.FileProvider" on path: DexPathList[[zip file "/data/app/com.peerke.outdoorpuzzlegame.debug-IBtFsngoLqc-cQb_hOO5wQ==/base.apk"],nativeLibraryDirectories=[/data/app/com.peerke.outdoorpuzzlegame.debug-IBtFsngoLqc-cQb_hOO5wQ==/lib/x86, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:125)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at android.app.AppComponentFactory.instantiateProvider(AppComponentFactory.java:121)
        at androidx.core.app.CoreComponentFactory.instantiateProvider(CoreComponentFactory.java:62)
        at android.app.ActivityThread.installProvider(ActivityThread.java:6360)
        at android.app.ActivityThread.installContentProviders(ActivityThread.java:5932) 
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5847) 
        at android.app.ActivityThread.access00(ActivityThread.java:198) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1637) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6649) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:826)

异常是正确的。 android.support.v4.content.FileProvider 在我的应用程序中不存在。但是 androidx.core.content.FileProvider 包含在我的应用程序中。最大的问题是为什么它要加载旧版本的 FileProvider？

Answer 1

why does it want to load the old version of FileProvider?

根据堆栈跟踪，您可能仍在清单中的 <provider> 元素中使用旧包名称。

Answer 2

感谢@CommonsWare

更多说明：

怎么办，在 AndroidManifest.xml 中找到 <provider> 中的 android.support.v4.FileProvider。

改为androidx.core.content.FileProvider

Answer 3

在 manifiest.xml 文件中只需更改此

<provider
        android:name="android.support.v4.content.FileProvider"
      .....
</provider>

给这个

<provider
    android:name="androidx.core.content.FileProvider"
    ......
</provider>

或者干脆

转到重构（工作室 -> 菜单 -> 重构）
点击迁移到 AndroidX。
它正在工作。

ClassNotFoundException：在 androidx 迁移后未找到 class "android.support.v4.content.FileProvider"

ClassNotFoundException: Didn't find class "android.support.v4.content.FileProvider" after androidx migration

java

android

android-studio

androidx