android – 由于LayoutManager为NULL,RecycleView在Fragment中崩溃

概述我有三个选项卡都在tablayout中,在Tab1中,有一个RecycleView. 今天我想向它添加SwipeRefreshLayout： <android.support.v4.widget.SwipeRefreshLayout android:id="@+id/swiperefreshlayout" android:layout_width="match_parent" 我有三个选项卡都在tablayout中,在Tab1中,有一个RecycleVIEw.

今天我想向它添加SwipeRefreshLayout：

<androID.support.v4.Widget.SwipeRefreshLayout    androID:ID="@+ID/swiperefreshlayout"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent">    <androID.support.v7.Widget.RecyclerVIEw        androID:ID="@+ID/recyclerVIEw"        androID:layout_wIDth="match_parent"        androID:layout_height="match_parent">    </androID.support.v7.Widget.RecyclerVIEw></androID.support.v4.Widget.SwipeRefreshLayout>

在Tab1Fragment中：

@OverrIDepublic VIEw onCreateVIEw(LayoutInflater inflater,VIEwGroup container,Bundle savedInstanceState) {    VIEw vIEw = inflater.inflate(R.layout.activity_main_List,container,false);    recyclerVIEw = (RecyclerVIEw) vIEw.findVIEwByID(R.ID.recyclerVIEw);    staggeredGrIDLayoutManager = new StaggeredGrIDLayoutManager(3,StaggeredGrIDLayoutManager.VERTICAL);    recyclerVIEw.setLayoutManager(staggeredGrIDLayoutManager);     swipeRefreshLayout = (SwipeRefreshLayout) vIEw.findVIEwByID(R.ID.swiperefreshlayout);    swipeRefreshLayout.setcolorSchemeResources(androID.R.color.holo_blue_bright,androID.R.color.holo_green_light,androID.R.color.holo_orange_light,androID.R.color.holo_red_light);    return vIEw;}

不幸的是,当我从tab1滚动到tab2,然后回到tab1时,活动崩溃：

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean  androID.support.v7.Widget.RecyclerVIEw$LayoutManager.canScrollVertically()' on a null object reference  at androID.support.v7.Widget.RecyclerVIEw.computeVerticalScrollOffset(RecyclerVIEw.java:1613)  at androID.vIEw.VIEw.canScrollVertically(VIEw.java:12880)

但显然我已经设置了Layoutmanger！似乎交错的网格布局已经消失了……

更多Weired是,当我只是单击tab1,tab2时,Activity不会崩溃,但是当我从tab2滚动到tab1时,它崩溃了

发生了什么？谢谢！

加上整个错误日志：

12-02 16:57:59.857 28189-28189/xyz.doutu.doutu E/AndroIDRuntime: Process: xyz.doutu.doutu,PID: 28189        ava.lang.NullPointerException: Attempt to invoke virtual method 'boolean androID.support.v7.Widget.RecyclerVIEw$LayoutManager.canScrollVertically()' on a null object reference  at androID.support.v7.Widget.RecyclerVIEw.computeVerticalScrollOffset(RecyclerVIEw.java:1613)  at androID.vIEw.VIEw.canScrollVertically(VIEw.java:12880)  at androID.support.v4.vIEw.VIEwCompatICS.canScrollVertically(VIEwCompatICS.java:35)  at androID.support.v4.vIEw.VIEwCompat$ICSVIEwCompatImpl.canScrollVertically(VIEwCompat.java:1253)  at androID.support.v4.vIEw.VIEwCompat.canScrollVertically(VIEwCompat.java:1695)  at androID.support.v4.Widget.SwipeRefreshLayout.canChildScrollUp(SwipeRefreshLayout.java:646)  at androID.support.v4.Widget.SwipeRefreshLayout.onIntercepttouchEvent(SwipeRefreshLayout.java:660)  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:1961)  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2408)  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:2050)  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2408)  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:2050)  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2408)  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:2050)  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2408)  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:2050)  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2408)  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:2050)  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2408)  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:2050)  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2408)  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:2050)  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2408)  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:2050)  at com.androID.internal.policy.impl.PhoneWindow$DecorVIEw.superdispatchtouchEvent(PhoneWindow.java:2390)  at com.androID.internal.policy.impl.PhoneWindow.superdispatchtouchEvent(PhoneWindow.java:1734)  at androID.app.Activity.dispatchtouchEvent(Activity.java:2833)  at androID.support.v7.vIEw.WindowCallbackWrapper.dispatchtouchEvent(WindowCallbackWrapper.java:60)  at androID.support.v7.vIEw.WindowCallbackWrapper.dispatchtouchEvent(WindowCallbackWrapper.java:60)  at com.androID.internal.policy.impl.PhoneWindow$DecorVIEw.dispatchtouchEvent(PhoneWindow.java:2351)  at androID.vIEw.VIEw.dispatchPointerEvent(VIEw.java:8700)

解决方法 将recyclerVIEw分配移动到onVIEwCreated()而不是onCreateVIEw().问题是当您的TabFragment分离并重新附加到vIEwPager滚动时. 总结

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