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1. 
What is the primary programming language used for Android app development?

2. 
Which integrated development environment (IDE) is widely used for Android app development?

3. 
What is the essential file for configuring an Android app's properties and settings?

4. 
What is the entry point of an Android app, defining its user interface and behavior?

5. 
Which phase of the Android app lifecycle is responsible for preparing the app to receive user interaction?

6. 
What is the purpose of the 'onDestroy()' method in the Android app lifecycle?

7. 
In Android, what is the role of the 'R.java' file generated by the system?

8. 
What is the purpose of the 'adb' tool in Android development?

9. 
Which component is responsible for managing the app's user interface?

10. 
What does the 'findViewById()' method do in Android development?

11. 
Which layout manager is used to arrange UI elements in a grid format?

12. 
What is the role of the 'Intent' in Android development?

13. 
Which folder in the Android project structure contains localized resources for different languages?

14. 
What is the purpose of the 'onSaveInstanceState()' method in Android development?

15. 
Which class is responsible for handling database operations in Android?

16. 
What is the role of the 'AsyncTask' class in Android development?

17. 
What is the purpose of the 'contentProvider' in Android?

18. 
Which permission is required to access the internet in an Android app?

19. 
What is the purpose of the 'RecyclerView' in Android?

20. 
Which method is used to explicitly finish an activity in Android?