1. Which Android component lets an app share structured data with other apps?
- Service
- Content Provider
- Fragment
- BroadcastReceiver
Answer: B) Content Provider
Explanation: Content providers expose data through content URIs.
MCQs / Computer Science / UI Events, Views, Preferences and Data Storage
UI Events, Views, Preferences and Data Storage MCQs — Computer Science
39 multiple-choice questions on UI Events, Views, Preferences and Data Storage from Computer Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
2. Which class detects fling and double-tap gestures?
- ScaleGestureDetector
- TouchDelegate
- GestureDetector
- MotionLayout
Answer: C) GestureDetector
Explanation: GestureDetector recognises common gestures.
3. Which data type can NOT be stored directly in SharedPreferences?
- A Bitmap image
- Set of Strings
- Float
- Boolean
Answer: A) A Bitmap image
Explanation: Only primitives, Strings and String sets are supported.
4. Which RecyclerView adapter method inflates a row layout?
- onCreateViewHolder()
- getItemCount()
- onBindViewHolder()
- onAttachedToRecyclerView()
Answer: A) onCreateViewHolder()
Explanation: onCreateViewHolder creates the ViewHolder with an inflated row.
5. Scoped storage (Android 10/11+) means apps:
- Cannot save any files
- Have free access to their own folders but use MediaStore/SAF for shared files
- Can read every file on the SD card
- Need root access
Answer: B) Have free access to their own folders but use MediaStore/SAF for shared files
Explanation: Scoped storage limits broad file access.
6. The listener notified when a CheckBox is ticked or unticked is:
- OnKeyListener
- TextWatcher
- OnCheckedChangeListener
- OnFocusChangeListener
Answer: C) OnCheckedChangeListener
Explanation: CompoundButton.OnCheckedChangeListener reports state changes.
7. Which class helps create and upgrade an SQLite database?
- SQLiteOpenHelper
- ContentResolver
- CursorAdapter
- SharedPreferences
Answer: A) SQLiteOpenHelper
Explanation: SQLiteOpenHelper provides onCreate and onUpgrade.
8. In Room, a class annotated with @Entity represents a:
- Database connection
- Table
- Query
- Activity
Answer: B) Table
Explanation: Each entity becomes a table.
9. To display items in a two-column grid, use:
- ScrollView
- LinearLayoutManager
- GridLayoutManager(context, 2)
- FrameLayout
Answer: C) GridLayoutManager(context, 2)
Explanation: GridLayoutManager arranges rows in a grid with a given span count.
10. Which method fills a row with data for a given position?
- inflate()
- onBindViewHolder()
- notifyAll()
- onCreateViewHolder()
Answer: B) onBindViewHolder()
Explanation: onBindViewHolder binds data to the row views.
11. Which is the correct way to read a string preference with a default value?
- prefs.getString("username", "Guest")
- prefs.read("username")
- prefs.username
- prefs.getString("username")
Answer: A) prefs.getString("username", "Guest")
Explanation: The second parameter is returned if the key is missing.
12. Settings screens built from XML preferences are displayed with:
- DialogFragment only
- NotificationCompat
- PreferenceFragmentCompat
- RecyclerView only
Answer: C) PreferenceFragmentCompat
Explanation: The AndroidX Preference library uses PreferenceFragmentCompat.
13. A content URI begins with:
- file://
- content://
- data://
- http://
Answer: B) content://
Explanation: Content providers use the content:// scheme.
14. Running a Room query on the main (UI) thread by default:
- Is recommended
- Throws an exception, because database work must be off the main thread
- Is faster
- Deletes the table
Answer: B) Throws an exception, because database work must be off the main thread
Explanation: Room blocks main-thread access to keep the UI responsive.
15. Apps access a content provider through a:
- PackageInstaller
- LayoutInflater
- FragmentManager
- ContentResolver
Answer: D) ContentResolver
Explanation: ContentResolver sends query/insert/update/delete calls to providers.
16. Room methods that read or write the database are declared in a:
- Manifest
- Layout
- DAO (Data Access Object) interface
- ViewModel
Answer: C) DAO (Data Access Object) interface
Explanation: DAOs contain annotated query methods.
17. DiffUtil with ListAdapter helps by:
- Saving to SQLite
- Updating only the rows that changed
- Translating text
- Encrypting data
Answer: B) Updating only the rows that changed
Explanation: DiffUtil computes the difference between old and new lists.
18. Returning true from onLongClick() means:
- The long press repeats
- The click is ignored
- The app closes
- The event is consumed and no further click is triggered
Answer: D) The event is consumed and no further click is triggered
Explanation: true consumes the event.
19. Which listener is used with a Spinner?
- OnClickListener only
- OnCheckedChangeListener
- OnItemSelectedListener
- OnEditorActionListener
Answer: C) OnItemSelectedListener
Explanation: AdapterView.OnItemSelectedListener reports the chosen item.
20. SharedPreferences data is removed when:
- The app is uninstalled or its data is cleared
- The activity rotates
- The app goes to the background
- The phone restarts
Answer: A) The app is uninstalled or its data is cleared
Explanation: Preferences persist across restarts until uninstall or clear data.
21. To share a private file (e.g. a PDF) with another app securely, use:
- A file:// URI
- SharedPreferences
- FileProvider with a temporary content:// URI
- A public static variable
Answer: C) FileProvider with a temporary content:// URI
Explanation: FileProvider grants temporary read access; file:// URIs are blocked since Android 7.
22. SharedPreferences store data as:
- JSON documents in the cloud
- Tables with rows
- Key–value pairs
- Images
Answer: C) Key–value pairs
Explanation: SharedPreferences hold simple key–value data.
23. Which listener responds when a button is tapped?
- OnClickListener
- OnFocusChangeListener
- TextWatcher
- OnSeekBarChangeListener
Answer: A) OnClickListener
Explanation: OnClickListener's onClick is called on a tap.
24. Which widget shows a star rating?
- RatingBar
- SeekBar
- Chip
- Switch
Answer: A) RatingBar
Explanation: RatingBar shows and selects star ratings.
25. Which MotionEvent action is reported when the finger is lifted?
- ACTIONDOWN
- ACTIONMOVE
- ACTIONUP
- ACTIONHOVER
Answer: C) ACTIONUP
Explanation: ACTIONUP is sent when the touch ends.
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Practise UI Events, Views, Preferences and Data Storage MCQs
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