Chapter 22. Launching Activities and Subactivities
The theory behind the Android UI architecture is that developers should decompose their application into distinct activities. For example, a calendar application could have activities for viewing the calendar, viewing a single event, editing an event (including adding a new one), and so forth. This implies that one of your activities has the means to start up another activity. For example, if a user selects an event from the view-calendar activity, you might want to show the view-event activity for that event. This means that you need to be able to cause the view-event activity to launch and show a specific event (the one the user chose).
This can be further broken down into two scenarios:
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