异常内容：
07-16 20:21:37.411: ERROR/AndroidRuntime(324): java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(-1, class com.ringcentral.android.utils.ui.widget.PullToRefresh) with Adapter(class android.widget.HeaderViewListAdapter)] 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at android.widget.ListView.layoutChildren(ListView.java:1492) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at android.widget.AbsListView.onTouchModeChanged(AbsListView.java:1960) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at android.view.ViewTreeObserver.dispatchOnTouchModeChanged(ViewTreeObserver.java:591) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at android.view.ViewRoot.ensureTouchModeLocally(ViewRoot.java:2021) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at android.view.ViewRoot.ensureTouchMode(ViewRoot.java:2005) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at android.view.ViewRoot.handleMessage(ViewRoot.java:1774) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at android.os.Handler.dispatchMessage(Handler.java:99) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at android.os.Looper.loop(Looper.java:123) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at android.app.ActivityThread.main(ActivityThread.java:4627) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at java.lang.reflect.Method.invokeNative(Native Method) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at java.lang.reflect.Method.invoke(Method.java:521) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 07-16 20:21:37.411: ERROR/AndroidRuntime(324): at dalvik.system.NativeStart.main(Native Method) 07-16 20:21:37.411: ERROR/AndroidRun
