What are the purposes of using Fragments in Android?

In Android, Fragments are primarily used for the following aspects:

1. Creating a flexible user interface: Fragments allow developers to divide the user interface into multiple modular parts, each with its own layout and behavior. This makes the user interface more flexible and adaptable to different screen sizes and orientations.
2. Creating reusable components: Fragments can be reused by multiple Activities, reducing the amount of repetitive coding work. By encapsulating certain reusable UI elements within a Fragment, they can be reused in different Activities.
3. Handling user interactions: Fragments can independently manage user input events, such as touch events and key events. This allows Fragments to respond to user interactions on their own and easily switch and reuse them across different activities.
4. Implementing multi-window support: In Android versions 7.0 and above, you can use Fragments to achieve multi-window support. By placing the content of each window in a separate Fragment, you can switch and interact between multiple windows.

In conclusion, Fragment is a very important component in Android that can help developers build flexible, reusable, and interactive user interfaces.