![]() The Android OS provides a framework for handling events. User interaction is at the core of any business logic implemented for an Android app. Simple Android apps can be built around a single activity, all other components being optional. Subsequently, when the screen becomes invisible due to the transition to another screen, the onStop( ) callback is triggered.įor a better understanding of all the lifecycle events on an activity, refer to the official documentation on activity lifecycle. For example, when the app is launched, and the UI screen corresponding to the main activity is displayed, the onCreate( ) callback is triggered on the main activity. These callbacks provide developers with the means to handle events triggered in the activities. They also follow a strict sequence of lifecycle events, which are triggered as callbacks. Activities are themselves composed of many kinds of UI components. Most of the Android apps are built around a series of activities with one screen transitioning to/from the other. These can be filesystem resources, a database, or any form of persistent storage provided by the phone hardware.įor more detailed coverage on these components, check out the official application fundamentals guide in the Android developer portal.
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