An Android app typically has several activities. Each activity displays a
user interface that allows the user to perform a specific task (such as view a map or take a photo).
To take the user from one activity to another, your app must use an
Intent to define your app's "intent" to do something. When you pass an
Intent to the system with a method such as
startActivity(), the system uses the
Intent to identify and start the appropriate app component. Using intents even
allows your app to start an activity that is contained in a separate app.
Intent can be explicit in order to start a specific component
Activity instance) or implicit in order to start any
component that can handle the intended action (such as "capture a photo").
This class shows you how to use an
Intent to perform some basic
interactions with other apps, such as start another app, receive a result from that app, and
make your app able to respond to intents from other apps.