NullPointerException at android.widget.AbsListView.obtainView.

最新推荐文章于 2021-06-21 02:30:50 发布

原创最新推荐文章于 2021-06-21 02:30:50 发布 · 1.6k 阅读

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#指针 #异常

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本文探讨了使用Adapter更新ListView时出现的空指针异常问题。具体表现为在更新数据并调用notifyDataSetChanged方法后，程序崩溃并抛出空指针异常。通过调试发现getView方法返回null是导致此问题的原因。

使用Adpater更新ListView数据时，莫名奇妙的报了个空指针。内容如下，

java.lang.NullPointerException
at android.widget.AbsListView.obtainView(AbsListView.java:2470)
at android.widget.ListView.makeAndAddView(ListView.java:1775)
at android.widget.ListView.fillDown(ListView.java:678)
at android.widget.ListView.fillFromTop(ListView.java:739)
at android.widget.ListView.layoutChildren(ListView.java:1614)
at android.widget.AbsListView.onLayout(AbsListView.java:2303)
at android.view.View.layout(View.java:14063)
at android.view.ViewGroup.layout(ViewGroup.java:4655)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1655)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1513)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1426)
at android.view.View.layout(View.java:14063)
at android.view.ViewGroup.layout(ViewGroup.java:4655)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14063)
at android.view.ViewGroup.layout(ViewGroup.java:4655)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14063)
at android.view.ViewGroup.layout(ViewGroup.java:4655)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:948)
at android.view.View.layout(View.java:14063)
at android.view.ViewGroup.layout(ViewGroup.java:4655)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14063)
at android.view.ViewGroup.layout(ViewGroup.java:4655)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:948)
at android.view.View.layout(View.java:14063)
at android.view.ViewGroup.layout(ViewGroup.java:4655)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14063)
at android.view.ViewGroup.layout(ViewGroup.java:4655)