An activity, as we have already learned, is given the opportunity to save dynamic state information via a call from the runtime system to the activity’s implementation of the onSaveInstanceState() method. Passed through as an argument to the method is a reference to a Bundle object into which the method will need to store any dynamic data that needs to be saved. The Bundle object is then stored by the runtime system on behalf of the activity and subsequently passed through as an argument to the activity’s onCreate() and onRestoreInstanceState() methods if and when they are called. The data can then be retrieved from the Bundle object within these methods and used to restore the state of the activity.
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