Activities

• An Activity represents a single window in your application

• The UI for that activity is described using a “Layoutâ€� which is an XML document describing a single screen and its controls

• A SMS app would have an activity for sending texts and an activity for checking your inbox/outbox

• Activities can be launched from outside your application if it permits it

• Activities can also be launched from other activities, when a user clicks a button for instance in a different activity