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Return the name of the activity that invoked this activity. This is who the data in Activity.SetResult(Result) will be sent to. You can use this information to validate that the recipient is allowed to receive the data.
Note: if the calling activity is not expecting a result (that is it did not use the Activity.StartActivityForResult(Android.Content.Intent, System.Int32) form that includes a request code), then the calling package will be null.