RecognizerIntent: how to add a bundle to a pending intent

I am implementing an activity that responds to the RecognizerIntent. Among others this activity must handle two incoming extras that specify a pending intent and its extras-bundle:

• EXTRA_RESULTS_PENDINGINTENT
• EXTRA_RESULTS_PENDINGINTENT_BUNDLE

Paraphrasing the documentation:

• If you use EXTRA_RESULTS_PENDINGINTENT to supply a PendingIntent, the results will be added to its bundle and the PendingIntent will be sent to its target.

• If you use EXTRA_RESULTS_PENDINGINTENT to supply a forwarding intent, you can also use EXTRA_RESULTS_PENDINGINTENT_BUNDLE to supply additional extras for the final intent. The search results will be added to this bundle, and the combined bundle will be sent to the target.

I have been looking in vain for sample code that would demonstrate the following.

What is the best way of extracting a PendingIntent from a bundle?

Should I do:

(PendingIntent)
        extras.getParcelable(RecognizerIntent.EXTRA_RESULTS_PENDINGINTENT)

How to add extras to the set of existing extras of a PendingIntent?

How to launch the modified PendingIntent?