在AndroidManifest.xml中加入下面这段话后，

android:name="android.support.v4.content.FileProvider"

android:authorities="com.boxin.forklift.fileprovider"

android:exported="false"

android:grantUriPermissions="true">

android:name="android.support.FILE_PROVIDER_PATHS"

android:resource="@xml/file_paths" />

在Android4.4.2版本的手机出现了下面的错误提示

E/AndroidRuntime: FATAL EXCEPTION: main

Process: com.boxin.forklift, PID: 7106

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.boxin.forklift-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.boxin.forklift-1, /vendor/lib, /system/lib, /data/datalib]]

at android.app.ActivityThread.installProvider(ActivityThread.java:5045)

at android.app.ActivityThread.installContentProviders(ActivityThread.java:4631)

at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4571)

at android.app.ActivityThread.access$1700(ActivityThread.java:143)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1304)

at android.os.Handler.dispatchMessage(Handler.java:102)

at android.os.Looper.loop(Looper.java:136)

at android.app.ActivityThread.main(ActivityThread.java:5291)

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:849)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)

at dalvik.system.NativeStart.main(Native Method)

Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v4.content.FileProvider" on path: DexPathList[[zip file "/data/app/com.boxin.forklift-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.boxin.forklift-1, /vendor/lib, /system/lib, /data/datalib]]

at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)

at java.lang.ClassLoader.loadClass(ClassLoader.java:497)

at java.lang.ClassLoader.loadClass(ClassLoader.java:457)

at android.app.ActivityThread.installProvider(ActivityThread.java:5030)

at android.app.ActivityThread.installContentProviders(ActivityThread.java:4631)

at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4571)

at android.app.ActivityThread.access$1700(ActivityThread.java:143)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1304)

at android.os.Handler.dispatchMessage(Handler.java:102)

at android.os.Looper.loop(Looper.java:136)

at android.app.ActivityThread.main(ActivityThread.java:5291)

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:849)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)

at dalvik.system.NativeStart.main(Native Method)

解决方案：

第一：可能是添加MultiDex分包，但未初始化的原因，在Application中重写attachBaseContext函数，对MultiDex初始化即可。

1)首先修改Gradle配置文件，启用MultiDex并包含MultiDex支持：

defaultConfig {

multiDexEnabled true

}

项目完整写法：

android {

compileSdkVersion 27

defaultConfig {

applicationId "com.boxin.forklift"

minSdkVersion 19

targetSdkVersion 27

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

multiDexEnabled true

}

2)修改BoXinApplication,重写attachBaseContext方法

BoxinApplication默认的命名方式是：BaseApplication

@Override

protected void attachBaseContext(Context base) {

super.attachBaseContext(base);

MultiDex.install(base);

}

加入后成功运行项目到手机。

以上这篇解决android.support.v4.content.FileProvide找不到的问题就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。