在AndroidManifest.xml中加入下面這段話后，

<provider android:name='android.support.v4.content.FileProvider' android:authorities='com.boxin.forklift.fileprovider' android:exported='false' android:grantUriPermissions='true'> <meta-dataandroid:name='android.support.FILE_PROVIDER_PATHS'android:resource='@xml/file_paths' /> </provider>

在Android4.4.2版本的手機出現了下面的錯誤提示

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)

解決方案：

第一：可能是添加MultiDex分包，但未初始化的原因，在Application中重寫attachBaseContext函數，對MultiDex初始化即可。

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

defaultConfig { multiDexEnabled true }

項目完整寫法：

android { compileSdkVersion 27 defaultConfig { applicationId 'com.boxin.forklift' minSdkVersion 19 targetSdkVersion 27 testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner' multiDexEnabled true }

2）修改BoXinApplication,重寫attachBaseContext方法

BoxinApplication默認的命名方式是：BaseApplication

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

加入后成功運行項目到手機。

以上這篇解決android.support.v4.content.FileProvide找不到的問題就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持好吧啦網。