在AndroidManifest.xml中加入下面这段话后，
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.boxin.forklift.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
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Devmax。