title: Unexplainable ClassCastException in android.widget.ProgressBar.onRestoreInstanceState
body: <p>I've had my application out in the store for a while, but it seems it crashes occasionally according to the crash reports in the Developer Console, saying:
  <code>java.lang.ClassCastException in android.widget.ProgressBar.onRestoreInstanceState</code> with the stack trace:</p>
  
  <pre><code>java.lang.RuntimeException: Unable to start activity ComponentInfo{com.company.myapp/com.mycompany.myapp.activity.MyActivity}: java.lang.ClassCastException: android.view.AbsSavedState$1 cannot be cast to android.widget.ProgressBar$SavedState
  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1996)
  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2023)
  at android.app.ActivityThread.access$600(ActivityThread.java:127)
  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1174)
  at android.os.Handler.dispatchMessage(Handler.java:99)
  at android.os.Looper.loop(Looper.java:137)
  at android.app.ActivityThread.main(ActivityThread.java:4503)
  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:809)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
  at dalvik.system.NativeStart.main(Native Method)
  Caused by: java.lang.ClassCastException: android.view.AbsSavedState$1 cannot be cast to android.widget.ProgressBar$SavedState
  at android.widget.ProgressBar.onRestoreInstanceState(ProgressBar.java:1093)
  at android.view.View.dispatchRestoreInstanceState(View.java:9975)
  at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2408)
  at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2408)
  at android.view.View.restoreHierarchyState(View.java:9951)
  at com.android.internal.policy.impl.PhoneWindow.restoreHierarchyState(PhoneWindow.java:1611)
  at android.app.Activity.onRestoreInstanceState(Activity.java:908)
  at android.app.Activity.performRestoreInstanceState(Activity.java:880)
  at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1102)
  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
  ... 11 more
  </code></pre>
  
  <p>The reason for these crashes eludes me, and I can't reproduce it on any of my devices. I don't have a <code>onRestoreInstanceState</code> overridden anywhere either. Can anyone point me in a direction that makes sense?</p>