Unexplainable ClassCastException in android.widget.ProgressBar.onRestoreInstanceState

Question

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: java.lang.ClassCastException in android.widget.ProgressBar.onRestoreInstanceState with the stack trace:

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 

The reason for these crashes eludes me, and I can't reproduce it on any of my devices. I don't have a onRestoreInstanceState overridden anywhere either. Can anyone point me in a direction that makes sense?

Answer 1

I've seen similar issues to this before, and it's because you have two id's that share the same name.

The onRestoreInstanceState has performed the findViewById method and the first view to be found was not the ProgressView.

Double check that your application does not reuse the same ID in two different places