AAD AAD Android Architecture & App Components 1 — Questions and Answers
Question 1: Which Android component serves as the primary entry point for user interaction and displays a single screen with a user interface?
- Service
- Activity (Correct answer)
- BroadcastReceiver
- ContentProvider
Correct answer: Activity
An Activity represents a single screen with a UI and is the primary entry point for user interaction in an Android app.
Question 2: Which Android component is designed to perform long-running background operations without a user interface?
- Fragment
- Activity
- Service (Correct answer)
- Intent
Correct answer: Service
A Service runs in the background to perform long-running operations without providing a user interface.
Question 3: In the Activity lifecycle, which method is called when the Activity is first created?
- onStart()
- onResume()
- onCreate() (Correct answer)
- onRestart()
Correct answer: onCreate()
onCreate() is the first lifecycle callback called when an Activity is created, where you initialize the UI and data.
Question 4: What is the primary purpose of an Intent in Android?
- To store persistent data
- To define UI layouts
- To schedule background tasks
- To facilitate communication between components (Correct answer)
Correct answer: To facilitate communication between components
An Intent is a messaging object used to request an action from another component, facilitating communication between Activities, Services, and BroadcastReceivers.
Question 5: Which Activity lifecycle method is called when the Activity becomes visible to the user but may not yet be in the foreground?
- onResume()
- onStart() (Correct answer)
- onRestart()
- onPause()
Correct answer: onStart()
onStart() is called when the Activity becomes visible to the user, before it enters the foreground interactive state.
Question 6: What is a Fragment in Android?
- A standalone app process
- A reusable UI portion that lives inside an Activity (Correct answer)
- A background service component
- A type of Intent
Correct answer: A reusable UI portion that lives inside an Activity
A Fragment is a reusable portion of your app's UI that has its own lifecycle and can be embedded in an Activity.
AAD AAD Android Architecture & App Components 1
Which Android component serves as the primary entry point for user interaction and displays a single screen with a user interface?