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我已经在我的应用程序中完成了Facebook集成，它对我来说工作正常。但是，当我点击清除凭证按钮，然后又想登录共享应用程序崩溃并给出异常的内容。以下是例外细节。我在谷歌搜索，但没有得到任何满意的答案。在Facebook共享得到异常android.webkit.WebView.onWindowFocusChanged
11-06 17:25:32.074: E/AndroidRuntime(410): java.lang.NullPointerException
11-06 17:25:32.074: E/AndroidRuntime(410): at android.webkit.WebView.onWindowFocusChanged(WebView.java:4177)
11-06 17:25:32.074: E/AndroidRuntime(410): at android.view.View.dispatchWindowFocusChanged(View.java:3788)
11-06 17:25:32.074: E/AndroidRuntime(410): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:658)
11-06 17:25:32.074: E/AndroidRuntime(410): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:662)
11-06 17:25:32.074: E/AndroidRuntime(410): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:662)
11-06 17:25:32.074: E/AndroidRuntime(410): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:662)
11-06 17:25:32.074: E/AndroidRuntime(410): at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:662)
11-06 17:25:32.074: E/AndroidRuntime(410): at android.view.ViewRoot.handleMessage(ViewRoot.java:1921)
11-06 17:25:32.074: E/AndroidRuntime(410): at android.os.Handler.dispatchMessage(Handler.java:99)
11-06 17:25:32.074: E/AndroidRuntime(410): at android.os.Looper.loop(Looper.java:123)
11-06 17:25:32.074: E/AndroidRuntime(410): at android.app.ActivityThread.main(ActivityThread.java:4627)
11-06 17:25:32.074: E/AndroidRuntime(410): at java.lang.reflect.Method.invokeNative(Native Method)
11-06 17:25:32.074: E/AndroidRuntime(410): at java.lang.reflect.Method.invoke(Method.java:521)
11-06 17:25:32.074: E/AndroidRuntime(410): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-06 17:25:32.074: E/AndroidRuntime(410): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-06 17:25:32.074: E/AndroidRuntime(410): at dalvik.system.NativeStart.main(Native Method)
请帮我找出为什么这个例外即将到来以及如何解决这个问题。任何帮助表示赞赏。