Custom preference - When do onSaveInstanceState and onRestoreInstanceState get called?

Custom preference - When do onSaveInstanceState and onRestoreInstanceState
get called?

References

Reference NO 1

http://stackoverflow.com/questions/15186061/custom-preference-when-do-onsaveinstancestate-and-onrestoreinstancestate-get-c

Reference NO 2

http://stackoverflow.com/questions/5574462/why-onrestoreinstancestate-never-gets-called

Reference NO 3

http://developer.android.com/reference/android/preference/DialogPreference.html

Reference NO 4

http://developer.android.com/reference/android/preference/ListPreference.html

Reference NO 5

http://developer.android.com/reference/android/app/Activity.html

Reference NO 6

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Reference NO 7

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Reference NO 8

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