Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference（Fb）

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关于facebook相关的报错：

 java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference                                                     at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:911)                                                     at com.facebook.internal.Utility.queryAppSettings(Utility.java:846)                                                     at com.facebook.login.widget.LoginButton$1.run(LoginButton.java:491)                                                     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)                                                     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)                                                     at java.lang.Thread.run(Thread.java:811)

在清单文件中：配置appkey时

<!-- FaceBook ApiKey -->        <meta-data            android:name="com.facebook.sdk.ApplicationId"            android:value="@string/face_book_apiid" />

value的位置必须按照上面的写法引用资源文件，

value=“14224542221XXX”此种方式无效

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