What is the function of an activity in Android?
In Android, an Activity is a fundamental component of an application, used to represent a screen within the application. Each Activity has a user interface through which users can interact with the application.
The main function of Activity includes:
- Activity is responsible for displaying the user interface of the application, such as showing layouts, buttons, text boxes, etc. Users can interact with the interface to carry out various operations.
- Handling user input: Activities can process user input by listening to touch, key press, and other interactions. For example, when a user clicks a button, the Activity can perform the corresponding action.
- Lifecycle Management: Activities have their own lifecycle, which includes stages such as creation, starting, pausing, resuming, stopping, and destroying. During each stage, Activities can perform relevant operations, such as initializing data, saving, and restoring states.
- Launching other Activities: One Activity can start another Activity, enabling the switching and interaction between different interfaces. For example, by clicking a button, you can start another Activity to display a different interface.
- Interacting with other components: Activity can interact with other Android components such as Service, BroadcastReceiver, and ContentProvider. By interacting with these components, Activity can accomplish more complex functions.
In short, Activity is one of the core components of an Android app, responsible for providing the user interface, handling user input, managing the app’s life cycle, and interacting with other components to make the app interactive and scalable.
