Facebook整合上下文空错误

Question

  

java.lang.NullPointerException：Argument＆＃39; context＆＃39;不能为空                                                                                            在com.facebook.internal.Validate.notNull（Validate.java:76）                                                                                            在   com.facebook.internal.Utility.getMetadataApplicationId（Utility.java:594）                                                                                            在   com.facebook.appevents.AppEventsLogger。（AppEventsLogger.java:757）                                                                                            在   com.facebook.appevents.AppEventsLogger。（AppEventsLogger.java:732）                                                                                            在   com.facebook.appevents.AppEventsLogger.newLogger（AppEventsLogger.java:400）                                                                                            在   com.facebook.FacebookButtonBase.logBu​​ttonCreated（FacebookButtonBase.java:225）                                                                                            在   com.facebook.FacebookButtonBase.onAttachedToWindow（FacebookButtonBase.java:136）                                                                                            在   com.facebook.login.widget.LoginButton.onAttachedToWindow（LoginButton.java:452）                                                                                            在android.view.View.dispatchAttachedToWindow（View.java:14514）                                                                                            在   android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）                                                                                            在   android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）                                                                                            在   android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）                                                                                            在   android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）                                                                                            在   android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）                                                                                            在   android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）                                                                                            在   android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）                                                                                            在   android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）                                                                                            在   android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）                                                                                            在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1364）                                                                                            在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1107）                                                                                            在   android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:6013）                                                                                            在   android.view.Choreographer $ CallbackRecord.run（Choreographer.java:858）                                                                                            在android.view.Choreographer.doCallbacks（Choreographer.java:670）                                                                                            在android.view.Choreographer.doFrame（Choreographer.java:606）                                                                                            在   android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:844）                                                                                            在android.os.Handler.handleCallback（Handler.java:739）                                                                                            在android.os.Handler.dispatchMessage（Handler.java:95）                                                                                            在android.os.Looper.loop（Looper.java:148）                                                                                            在android.app.ActivityThread.main（ActivityThread.java:5417）                                                                                            at java.lang.reflect.Method.invoke（Native Method）                                                                                            在   com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:726）                                                                                            在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616）