小编Ilh*_*mri的帖子

我以前在我的应用程序中有5个月的Facebook登录按钮,它按预期工作......直到今天.这NullPointerException出现了:

java.lang.NullPointerException: Argument 'context' cannot be null
    at com.facebook.internal.Validate.notNull(Validate.java:76)
    at com.facebook.internal.Utility.getMetadataApplicationId(Utility.java:594)
    at com.facebook.appevents.AppEventsLogger.<init>(AppEventsLogger.java:757)
    at com.facebook.appevents.AppEventsLogger.<init>(AppEventsLogger.java:732)
    at com.facebook.appevents.AppEventsLogger.newLogger(AppEventsLogger.java:400)
    at com.facebook.FacebookButtonBase.logButtonCreated(FacebookButtonBase.java:225)
    at com.facebook.FacebookButtonBase.onAttachedToWindow(FacebookButtonBase.java:136)
    at com.facebook.login.widget.LoginButton.onAttachedToWindow(LoginButton.java:452)
    at android.view.View.dispatchAttachedToWindow(View.java:14514)
    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2843)
    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2843)
    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2843)
    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2843)
    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2843)
    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2843)
    at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2843)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1364)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
    at android.view.Choreographer.doCallbacks(Choreographer.java:670)
    at android.view.Choreographer.doFrame(Choreographer.java:606)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5417)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

我怀疑它是由以下清单文件引起的:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="orange.oaca">

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> …