找不到类"androidx.core.content.FileProvider" [英] Didn't find class "androidx.core.content.FileProvider"

问题描述

我将我的应用程序迁移到AndroidX，并且在API级别21上启动时崩溃.我的应用程序抛出此异常:

I migrated my app to AndroidX and it's crashing on launch on API level 21. My application throws this exception:

10-08 09:42:50.930 11346-11346/com.example.test E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.test, PID: 11346
java.lang.RuntimeException: Unable to get provider androidx.core.content.FileProvider: java.lang.ClassNotFoundException: Didn't find class "androidx.core.content.FileProvider" on path: DexPathList[[zip file "/data/app/com.example.test-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.test-1, /vendor/lib, /system/lib]]
    at android.app.ActivityThread.installProvider(ActivityThread.java:5121)
    at android.app.ActivityThread.installContentProviders(ActivityThread.java:4713)
    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4596)
    at android.app.ActivityThread.access$1600(ActivityThread.java:169)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1340)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:146)
    at android.app.ActivityThread.main(ActivityThread.java:5487)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
    at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.core.content.FileProvider" on path: DexPathList[[zip file "/data/app/com.example.test.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.test-1, /vendor/lib, /system/lib]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:67)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
    at android.app.ActivityThread.installProvider(ActivityThread.java:5106)
    at android.app.ActivityThread.installContentProviders(ActivityThread.java:4713) 
    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4596) 
    at android.app.ActivityThread.access$1600(ActivityThread.java:169) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1340) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:146) 
    at android.app.ActivityThread.main(ActivityThread.java:5487) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) 
    at dalvik.system.NativeStart.main(Native Method)

这是我的AndroidManifest.xml文件中的provider定义:

And here is the provider definition in my AndroidManifest.xml file:

<provider
    android:name="androidx.core.content.FileProvider"
    android:authorities="${applicationId}.fileProvider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/provider_paths" />
</provider>

在最新的API级别上，它可以正常工作.任何建议都会有用，在此先感谢.

On the latest API level it works fine. Any suggestions would be useful, thanks in advance.

推荐答案

似乎此错误是由于您的应用中的MultiDex配置不完整引起的. 此处，您可能会发现类似的问题，并且

It seems that this error came from incomplete configuration of MultiDex in your app. Here you may find the similar issue and here is an article answering it.

我建议您检查以下内容(扩展App类对我有帮助):

I suggest you to check the following (extending App class helped me):

您的Application类(例如，如果使用App.class，则应从MultiDexApplication类扩展):

Your Application class (App.class, for instance, if you use it) should extend from MultiDexApplication class:

public class BaseApplication extends MultiDexApplication {}

或者如果您不使用Application类，请检查清单:

or if you don't use Application class check your manifest:

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.android.multidex.myapplication">
        <application
            ...
            android:name="android.support.multidex.MultiDexApplication">
            ...
        </application>
    </manifest>

这篇关于找不到类"androidx.core.content.FileProvider"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！