[android-developers] When to call RemoteViews.setOnClickPendingIntent()?

From examples and tutorials I've seen, this call is normally made when
the app widget is updated. Typically, this happens when the the widget
is added to the Home screen and then also periodically according to
some configured time interval.

But is this really necessary? Isn't once (when the widget is added to
the Home screen) enough or are there some lifecycle issues to consider?
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