Activities and Fragments
-
What is an Activity in Android?
- An Activity represents a single screen with a user interface. It is a key component for creating the user interface and handling user interactions.
-
What is the difference between an explicit and implicit Intent?
- An explicit Intent specifies the component (e.g., Activity) to start, while an implicit Intent describes an action to perform, allowing the system to choose an appropriate component.
-
Explain the purpose of the onActivityResult() method.
- onActivityResult() is used to receive results from child activities started with startActivityForResult(). It’s essential for communication between activities.
-
What is a Fragment in Android, and why is it used?
- A Fragment is a modular component that can be combined to create more complex user interfaces within an Activity. It promotes reusability and flexibility.
-
What is a back stack in Android, and how does it work?
- The back stack is a collection of activities on the device, allowing users to navigate backward through the history of activities. The back stack is managed by the Android system.
-
Explain the differences between onCreate(), onStart(), and onResume() methods in an Android Activity.
- onCreate() is called when the activity is first created, onStart() is called when the activity becomes visible, and onResume() is called when the activity is at the forefront.
-
How can you pass data between Fragments and Activities in Android?
- You can pass data between Fragments and Activities using Bundle objects or interfaces. Additionally, you can use ViewModels to share data between them.
