Activities In Android:
In Android, an activity is an application component that defines a screen of
information and all of the associated actions the user can perform. Your app is a collection of
activities, consisting of both the activities you create and those you re-use from other apps.
Tasks:
A task is the sequence of activities a user follows to accomplish a goal. A
single task can make use of activities from just one app, or may draw on activities from a number
of different apps.
Intents:
An intent is a mechanism for one app to signal it would like another
app's assistance in performing an action. An app's activities can indicate which intents
they can respond to. For common intents such as "Share", the user may have many apps installed
that can fulfill that request.
