Each screen in an Android application is represented within the code as an activity. When you create Android applications, you can create an activity class for each screen you need. If you need to ...

This post explains the Android app lifecycle — showing how an activity will progress through multiple stages as it is open, sent to the background, and then brought to the foreground again.

An Android permission called activity recognition has been used by a number of third-party apps to track a user's location and physical activity.