Application Lifecycle: Android OS

摘要

The application lifecycle is an important concept to understand when programming tablet devices. To understand application lifecycle, let's look at the Android OS.Android defines four program components, and we will focus on two: "activities" and "services." An activity represents a single screen with a user interface, which may be closed at any time. A service is a component that, when set to foreground mode, can run without interruption to perform long-running operations.