[已解決] Attempt to invoke virtual method 'int android.view.View.getImportantForAccessibility()' on a n
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportantForAccessibility()' on a null object reference
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.widget.AbsListView.obtainView(AbsListView.java:2363)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.widget.ListView.measureHeightOfChildren(ListView.java:1270)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.widget.ListView.onMeasure(ListView.java:1182)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.View.measure(View.java:17565)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:727)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:463)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.View.measure(View.java:17565)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5537)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.View.measure(View.java:17565)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5537)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:391)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.View.measure(View.java:17565)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5537)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.View.measure(View.java:17565)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5537)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.View.measure(View.java:17565)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5537)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2615)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.View.measure(View.java:17565)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2045)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1196)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1409)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1084)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5990)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.Choreographer.doCallbacks(Choreographer.java:580)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.Choreographer.doFrame(Choreographer.java:550)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:739)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:95)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5343)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
05-29 11:45:24.014 12678-12678/tech.androidstudio.cartdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
原因分析：
ListView 的getView 方法裡面返回的為空了，檢查一下返回的view 就可以了
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