當我嘗試登錄Facebook Android時應用崩潰

Question

我不知道為什么當我單擊Facebook登錄按鈕時，我的應用程序崩潰時會拋出NPE。 我已經添加並檢查了所有必要的庫文件。 但仍然崩潰。 請幫助我。

我的LogCat

05-29 13:28:58.770: E/AndroidRuntime(4161): FATAL EXCEPTION: main
05-29 13:28:58.770: E/AndroidRuntime(4161): java.lang.NullPointerException
05-29 13:28:58.770: E/AndroidRuntime(4161):     at android.support.v4.content.LocalBroadcastManager.<init>(LocalBroadcastManager.java:110)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at android.support.v4.content.LocalBroadcastManager.getInstance(LocalBroadcastManager.java:102)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at com.facebook.Session.postActiveSessionAction(Session.java:1574)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at com.facebook.Session.setActiveSession(Session.java:971)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at com.facebook.Session.openActiveSession(Session.java:1126)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at com.facebook.Session.openActiveSession(Session.java:1035)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at com.trimex.amadora.FlipperRegister.intialiseFBLogin(FlipperRegister.java:398)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at com.trimex.amadora.FlipperRegister.onClick(FlipperRegister.java:292)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at android.view.View.performClick(View.java:4475)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at android.view.View$PerformClick.run(View.java:18786)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at android.os.Handler.handleCallback(Handler.java:730)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at android.os.Handler.dispatchMessage(Handler.java:92)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at android.os.Looper.loop(Looper.java:137)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at android.app.ActivityThread.main(ActivityThread.java:5454)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at java.lang.reflect.Method.invokeNative(Native Method)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at java.lang.reflect.Method.invoke(Method.java:525)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
05-29 13:28:58.770: E/AndroidRuntime(4161):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

因此您擁有了廣播時，接收方收聽的廣播。

但是，如果您要響應此廣播的內容在廣播過程中立即為空，那該怎么辦。

因此，請檢查您在定義監聽器的活動或片段是否在調用之前實例化了。