java.lang.NullPointerException

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    • java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getTop()' on a null object reference at com.wenming.weiswift.ui.login.fragment.home.weiboitemdetail.activity.BaseDetailActivity$6.onScrollStateChanged(BaseDetailActivity.java:334) at android.support.v7.widget.RecyclerView.dispatchOnScrollStateChanged(RecyclerView.java:3972) at android.support.v7.widget.RecyclerView.setScrollState(RecyclerView.java:1194) at android.support.v7.widget.RecyclerView.access$3900(RecyclerView.java:147) at android.support.v7.widget.RecyclerView$ViewFlinger.fling(RecyclerView.java:4149) at android.support.v7.widget.RecyclerView.fling(RecyclerView.java:1849) at android.support.v7.widget.RecyclerView.onTouchEvent(RecyclerView.java:2482) at android.view.View.dispatchTouchEvent(View.java:9306) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2548) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2241) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2554) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2255) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2554) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2255) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2554) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2255) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2554) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2255) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2554) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2255) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2554) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2255) at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2403) at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1737) at android.app.Activity.dispatchTouchEvent(Activity.java:2820) at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2364) at android.view.View.dispatchPointerEvent(View.java:9526) at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4262) at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4128) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3669) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3722) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3688) at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3814) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3696) at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3871) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3669) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3722) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3688) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3696) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3669) at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5954) at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5928) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5889) at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6057) at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185) at android.os.MessageQueue.nativePollOnce(Native Method) at android.os.MessageQueue.next(MessageQueue.java:323) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5438) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)
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