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POandroid.view.ViewRootImpl.performTraversals
 

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    <p>I have activity with MediaPlayer. But lots of users don`t like it because of crashes with exception:</p> <pre><code>java.lang.NullPointerException at android.os.Parcel.readException(Parcel.java:1333) at android.os.Parcel.readException(Parcel.java:1281) at android.view.IWindowSession$Stub$Proxy.relayout(IWindowSession.java:634) at android.view.ViewRootImpl.relayoutWindow(ViewRootImpl.java:3751) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1321) at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2587) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4424) 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:784) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>I can not reproduce this bug on my device, but according to the user messages I am a bad developer:)) and this exception appear after few seconds when video playback starts. It is interesting that it keeps working even after Error report dialog was shown. </p> <p>Looking for a reason in android source code I found that it happens after transaction using iBinder.</p> <pre><code>mRemote.transact(Stub.TRANSACTION_relayout, _data, _reply, 0); _reply.readException(); </code></pre> <p>This code executed in performTraversalsMethod in ViewRootImpl using Runnable that scheduled in scheduleTraversals method. And it is hard to get context of execution of it. scheduleTraversals called in lots of methods (invalidate,handleScreenStateChange....).</p> <p>Any ideas?</p>
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    1. COWhich version is it running on, which versions is it crashing on, what are you sending to the service -- sounds as if it were unknown data -- could it be you've tested it with a newer Android version than that of those customers where it crashes? Wild guessing without further information.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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