android 開發中的奇怪空指針

今天測試組突然遇到很奇怪的錯誤。我還是那個態度，有錯誤就拿日誌給我。這樣才能解決。然後日誌就來了。排查一下立馬定位錯誤日誌爲：如下。瞬間懵逼，日誌原因很明確空指針。然後繼續找相關代碼。找到3遍愣是沒找到和我代碼中相關的代碼。都是api層的日誌提醒。這怎麼看。我就在想什麼時候會出現這個問題呢，最終通過各種辦法，終於瞭解到。這個是由於我在adapter的getView（） 中返回了null導致的。至於爲什麼返回null，我也是不想多說了。在此記錄一下。並希望有所幫助。

E/AndroidRuntime(16743): FATAL EXCEPTION: main
09-08 13:34:20.854: E/AndroidRuntime(16743): Process: com.ctc.itv.yueme, PID: 16743
09-08 13:34:20.854: E/AndroidRuntime(16743): java.lang.NullPointerException
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.AbsListView.obtainView(AbsListView.java:2279)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.ListView.measureHeightOfChildren(ListView.java:1263)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.ListView.onMeasure(ListView.java:1175)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.View.measure(View.java:16525)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.View.measure(View.java:16525)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.View.measure(View.java:16525)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.View.measure(View.java:16525)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.View.measure(View.java:16525)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.View.measure(View.java:16525)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.View.measure(View.java:16525)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.View.measure(View.java:16525)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1955)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1152)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1334)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1039)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5648)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.Choreographer.doCallbacks(Choreographer.java:574)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.Choreographer.doFrame(Choreographer.java:544)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.os.Handler.handleCallback(Handler.java:733)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.os.Handler.dispatchMessage(Handler.java:95)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.os.Looper.loop(Looper.java:136)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at android.app.ActivityThread.main(ActivityThread.java:5047)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at java.lang.reflect.Method.invokeNative(Native Method)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at java.lang.reflect.Method.invoke(Method.java:515)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
09-08 13:34:20.854: E/AndroidRuntime(16743):    at dalvik.system.NativeStart.main(Native Method)