Create a new activity in your Android project. In Eclipse, select your project and then choose "File," "New" and "Class." Enter a name for your class and click "Finish." ...

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.

With Live Activity, incoming food deliveries, sports games, and more can be tracked from the ‌iPhone‌'s Lock Screen or with the Dynamic Island, and Google's feature works in a similar way.