java.lang.RuntimeException: Unable to get provider android.support.v4.content.FileProvider

项目运行到其他手机没发现问题，运行到OPPOR8107时报以下错误：

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/***.apk"],nativeLibraryDirectories=[/data/app-lib/***-1, /vendor/lib, /system/lib]]at android.app.ActivityThread.installProvider(ActivityThread.java:4892)at android.app.ActivityThread.installContentProviders(ActivityThread.java:4484)at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4424)at android.app.ActivityThread.access$1500(ActivityThread.java:143)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269)at android.os.Handler.dispatchMessage(Handler.java:102)at android.os.Looper.loop(Looper.java:136)at android.app.ActivityThread.main(ActivityThread.java:5120)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:818)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:634)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/***-1.apk"],nativeLibraryDirectories=[/data/app-lib/***-1, /vendor/lib, /system/lib]]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:4877)at android.app.ActivityThread.installContentProviders(ActivityThread.java:4484) at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4424) at android.app.ActivityThread.access$1500(ActivityThread.java:143) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5120) at java.lang.reflect.Method.invokeNative(Native Method)

本来以为是引入聊天sdk的问题，后来发现是MultiDex未初始化的问题：
1）首先修改Gradle配置文件，启用MultiDex并包含MultiDex支持：

defaultConfig {multiDexEnabled true}

2）在Application中重写attachBaseContext方法

@Overrideprotected void attachBaseContext(Context base) {super.attachBaseContext(base);MultiDex.install(base);}

问题解决。

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