Android RecyclerView调用notifyDataSetChanged()异常
2015-09-06 14:43
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如题,在使用Android RecyclerView的时候,当在数据改变时我调用了notifyDataSetChanged()来刷新数据,却报如下空指针异常:
09-02 18:09:53.406: W/dalvikvm(1166): threadid=1: thread exiting with uncaught exception (group=0x42291700)
09-02 18:09:53.426: E/AndroidRuntime(1166): FATAL EXCEPTION: main
09-02 18:09:53.426: E/AndroidRuntime(1166): java.lang.NullPointerException
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v4.view.ViewCompat$ICSViewCompatImpl.setAccessibilityDelegate(ViewCompat.java:923)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v4.view.ViewCompat.setAccessibilityDelegate(ViewCompat.java:1343)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView$Recycler.addViewHolderToRecycledViewPool(RecyclerView.java:3900)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView$Recycler.recycleViewHolderInternal(RecyclerView.java:3888)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView$LayoutManager.scrapOrRecycleView(RecyclerView.java:5767)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView$LayoutManager.detachAndScrapAttachedViews(RecyclerView.java:5752)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.StaggeredGridLayoutManager.onLayoutChildren(StaggeredGridLayoutManager.java:571)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2118)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:2415)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2017)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1771)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1045)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5525)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.Choreographer.doFrame(Choreographer.java:532)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.os.Handler.handleCallback(Handler.java:730)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.os.Handler.dispatchMessage(Handler.java:92)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.os.Looper.loop(Looper.java:137)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.app.ActivityThread.main(ActivityThread.java:5103)
09-02 18:09:53.426: E/AndroidRuntime(1166): at java.lang.reflect.Method.invokeNative(Native Method)
09-02 18:09:53.426: E/AndroidRuntime(1166): at java.lang.reflect.Method.invoke(Method.java:525)
09-02 18:09:53.426: E/AndroidRuntime(1166): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:773)
09-02 18:09:53.426: E/AndroidRuntime(1166): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:589)
09-02 18:09:53.426: E/AndroidRuntime(1166): at dalvik.system.NativeStart.main(Native Method)
而调用notifyItemChanged(position);未出现异常。
经网上查阅相关的问题,有一个评论引起了我的注意。
按照评论的说法是没有设置LayoutManager;
于是我在调用setLayoutManager重新设置LayoutManager后再调用notifyDataSetChanged()。经测试果然没有出现异常了。针对这个问题我也是醉了。具体深层次的原因还没了解,先记录下来这个解决办法,如果遇到同样的问题有其他的解决办法还望不吝赐教!
09-02 18:09:53.406: W/dalvikvm(1166): threadid=1: thread exiting with uncaught exception (group=0x42291700)
09-02 18:09:53.426: E/AndroidRuntime(1166): FATAL EXCEPTION: main
09-02 18:09:53.426: E/AndroidRuntime(1166): java.lang.NullPointerException
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v4.view.ViewCompat$ICSViewCompatImpl.setAccessibilityDelegate(ViewCompat.java:923)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v4.view.ViewCompat.setAccessibilityDelegate(ViewCompat.java:1343)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView$Recycler.addViewHolderToRecycledViewPool(RecyclerView.java:3900)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView$Recycler.recycleViewHolderInternal(RecyclerView.java:3888)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView$LayoutManager.scrapOrRecycleView(RecyclerView.java:5767)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView$LayoutManager.detachAndScrapAttachedViews(RecyclerView.java:5752)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.StaggeredGridLayoutManager.onLayoutChildren(StaggeredGridLayoutManager.java:571)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2118)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:2415)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.View.layout(View.java:14298)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewGroup.layout(ViewGroup.java:4562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2017)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1771)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1045)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5525)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.Choreographer.doFrame(Choreographer.java:532)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.os.Handler.handleCallback(Handler.java:730)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.os.Handler.dispatchMessage(Handler.java:92)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.os.Looper.loop(Looper.java:137)
09-02 18:09:53.426: E/AndroidRuntime(1166): at android.app.ActivityThread.main(ActivityThread.java:5103)
09-02 18:09:53.426: E/AndroidRuntime(1166): at java.lang.reflect.Method.invokeNative(Native Method)
09-02 18:09:53.426: E/AndroidRuntime(1166): at java.lang.reflect.Method.invoke(Method.java:525)
09-02 18:09:53.426: E/AndroidRuntime(1166): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:773)
09-02 18:09:53.426: E/AndroidRuntime(1166): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:589)
09-02 18:09:53.426: E/AndroidRuntime(1166): at dalvik.system.NativeStart.main(Native Method)
而调用notifyItemChanged(position);未出现异常。
经网上查阅相关的问题,有一个评论引起了我的注意。
按照评论的说法是没有设置LayoutManager;
于是我在调用setLayoutManager重新设置LayoutManager后再调用notifyDataSetChanged()。经测试果然没有出现异常了。针对这个问题我也是醉了。具体深层次的原因还没了解,先记录下来这个解决办法,如果遇到同样的问题有其他的解决办法还望不吝赐教!
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