ColorWheelView incorrect state handling leads to crash

[mtotschnig]

When ColorWhellView tries to restore its state, app crashes, with below stacktrace.

Steps to reproduce

1. Activate Developer options and switch on option "Don't keep activities"
2. Open a SimpleColorWheelDialog. Put app into background, e.g by clicking on system UI Home button. Bring app back into foreground via task switcher.

App crashes

Test Environment

Property	Value
Library version	3.1-androidx
Android version	API 25

Stack Trace

    java.lang.RuntimeException: Unable to start activity ComponentInfo{org.totschnig.myexpenses.debug/org.totschnig.myexpenses.activity.AccountEdit}: java.lang.NullPointerException: Attempt to get length of null array
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
        at android.app.ActivityThread.-wrap12(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6119)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
     Caused by: java.lang.NullPointerException: Attempt to get length of null array
        at android.os.Parcel.readFloatArray(Parcel.java:1048)
        at eltos.simpledialogfragment.color.ColorWheelView$SavedState.<init>(ColorWheelView.java:398)
        at eltos.simpledialogfragment.color.ColorWheelView$SavedState.<init>(ColorWheelView.java:388)
        at eltos.simpledialogfragment.color.ColorWheelView$SavedState$1.createFromParcel(ColorWheelView.java:412)
        at eltos.simpledialogfragment.color.ColorWheelView$SavedState$1.createFromParcel(ColorWheelView.java:410)
        at android.os.Parcel.readParcelable(Parcel.java:2471)
        at android.os.Parcel.readValue(Parcel.java:2365)
        at android.os.Parcel.readSparseArrayInternal(Parcel.java:2813)
        at android.os.Parcel.readSparseArray(Parcel.java:2068)
        at android.os.Parcel.readValue(Parcel.java:2422)
        at android.os.Parcel.readArrayMapInternal(Parcel.java:2732)
        at android.os.BaseBundle.unparcel(BaseBundle.java:269)
        at android.os.Bundle.getSparseParcelableArray(Bundle.java:934)
        at com.android.internal.policy.PhoneWindow.restoreHierarchyState(PhoneWindow.java:2104)
        at android.app.Dialog.onRestoreInstanceState(Dialog.java:462)
        at androidx.fragment.app.DialogFragment.onActivityCreated(DialogFragment.java:475)
        at androidx.fragment.app.Fragment.performActivityCreated(Fragment.java:2619)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:904)
        at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
        at androidx.fragment.app.FragmentManagerImpl.dispatchStateChange(FragmentManagerImpl.java:2659)
        at androidx.fragment.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManagerImpl.java:2613)
        at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:246)
        at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:542)
        at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:201)
        at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1248)
        at android.app.Activity.performStart(Activity.java:6696)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2628)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
        at android.app.ActivityThread.-wrap12(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:154) 
        at android.app.ActivityThread.main(ActivityThread.java:6119) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 

[eltos]

Thanks a lot! 👍