java.lang.NullPointerException

最新推荐文章于 2021-03-07 05:58:13 发布

原创最新推荐文章于 2021-03-07 05:58:13 发布 · 579 阅读

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一名程序员在实现自定义BaseAdapter时忘记返回convertView，导致应用程序出现NullPointerException异常。通过本文，你可以了解到这一常见错误及其解决办法。

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做了这麽久程序员了居然还犯这个错，真是醉了。大家不要像我这麽糊涂

这是我继承BaseAdapter 重写getView（）方法，忘记返回convertView.


03-25 13:05:19.130: E/AndroidRuntime(7443): java.lang.NullPointerException
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.widget.AbsListView.obtainView(AbsListView.java:2352)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.widget.ListView.measureHeightOfChildren(ListView.java:1409)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.widget.ListView.onMeasure(ListView.java:1273)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at com.wotui.avi.view.MyListView.onMeasure(MyListView.java:28)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.View.measure(View.java:15286)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4832)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.View.measure(View.java:15286)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4832)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.View.measure(View.java:15286)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2094)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1256)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1486)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1154)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4639)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:734)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.Choreographer.doCallbacks(Choreographer.java:560)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.Choreographer.doFrame(Choreographer.java:529)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:719)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.os.Handler.handleCallback(Handler.java:615)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.os.Handler.dispatchMessage(Handler.java:92)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.os.Looper.loop(Looper.java:155)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at android.app.ActivityThread.main(ActivityThread.java:5511)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at java.lang.reflect.Method.invokeNative(Native Method)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at java.lang.reflect.Method.invoke(Method.java:511)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)
03-25 13:05:19.130: E/AndroidRuntime(7443): 	at dalvik.system.NativeStart.main(Native Method)