Android NullPointerException at android.text.BoringLayout.isBoring

最近遇到个很奇怪的问题，如题，下面是详细报错信息：

E/AndroidRuntime: FATAL EXCEPTION: main                  java.lang.NullPointerException                      at android.text.BoringLayout.isBoring(BoringLayout.java:260)                      at android.widget.TextView.onMeasure(TextView.java:6158)                      at android.view.View.measure(View.java:15518)                      at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681)                      at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)                      at android.view.View.measure(View.java:15518)                      at android.widget.ListView.setupChild(ListView.java:1909)                      at android.widget.ListView.makeAndAddView(ListView.java:1834)                      at android.widget.ListView.fillSpecific(ListView.java:1320)                      at android.widget.ListView.layoutChildren(ListView.java:1642)                      at android.widget.AbsListView.onLayout(AbsListView.java:1994)                      at android.view.View.layout(View.java:14008)                      at android.view.ViewGroup.layout(ViewGroup.java:4373)                      at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1663)                      at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1521)                      at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)                      at android.view.View.layout(View.java:14008)                      at android.view.ViewGroup.layout(ViewGroup.java:4373)                      at android.widget.FrameLayout.onLayout(FrameLayout.java:448)                      at android.view.View.layout(View.java:14008)                      at android.view.ViewGroup.layout(ViewGroup.java:4373)                      at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1663)                      at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1521)                      at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)                      at android.view.View.layout(View.java:14008)                      at android.view.ViewGroup.layout(ViewGroup.java:4373)                      at android.widget.FrameLayout.onLayout(FrameLayout.java:448)                      at android.view.View.layout(View.java:14008)                      at android.view.ViewGroup.layout(ViewGroup.java:4373)                      at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1663)                      at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1521)                      at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)                      at android.view.View.layout(View.java:14008)                      at android.view.ViewGroup.layout(ViewGroup.java:4373)                      at android.widget.FrameLayout.onLayout(FrameLayout.java:448)                      at android.view.View.layout(View.java:14008)                      at android.view.ViewGroup.layout(ViewGroup.java:4373)                      at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1892)                      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1711)                      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)                      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)                      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)                      at android.view.Choreographer.doCallbacks(Choreographer.java:562)                      at android.view.Choreographer.doFrame(Choreographer.java:532)                      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)                      at android.os.Handler.handleCallback(Handler.java:725)                      at android.os.Handler.dispatchMessage(Handler.java:92)                      at android.os.Looper.loop(Looper.java:137)                      at android.app.ActivityThread.main(ActivityThread.java:5041)                      at java.lang.reflect.Method.invokeNative(Native Method)                      at java.lang.reflect.Method.invoke(Method.java:511)                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)                      at dalvik.system.NativeStart.main(Native Method)

经过排查，是因为项目中用了一个继承自 TextView 的自定义控件，在 setText 方法里面，某些情况直接 return 掉了，然后导致的异常。当重写了 setText 方法的时候，如果调用它，它必须被设值，不能中途强行中断。

http://stackoverflow.com/questions/18214450/nullpointerexception-at-boringlayout-isboring-is-anything-but-boring

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