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QUESTION: 51 Topic: KOTLIN only

SharedPreferences.Editor is an interface used for modifying values in a SharedPreferences object. All changes you make in an editor are batched, and not copied back to the original SharedPreferences until you call:

commit()
apply()
commit() or apply()

Answer(s): C

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QUESTION: 52 Topic: KOTLIN only

SharedPreferences.Editor is an interface used for modifying values in a SharedPreferences object. To mark in the editor that a preference value should be removed, which will be done in the actual preferences once commit() or apply() is called, what method in SharedPreferences.Editor should we use?

delete(String key)
clear()
remove(String key)
removeAll()

Answer(s): B

Explanation:

clear() method marks in the editor to remove ALL values from the preferences. Once commit is called, the only remaining preferences will be any that you have defined in this editor.
And no delete and removeAll method exists in SharedPreferences.Editor

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QUESTION: 53 Topic: KOTLIN only

What is the incorrect statement about Data Access Object (androidx.room.Dao)?

Data Access Objects are the main classes where you define your database interactions. They can include a variety of query methods.
The class marked with @Dao should either be an interface or an abstract class. At compile time, Room will generate an implementation of this class when it is referenced by a Database.
An abstract @Dao class can optionally have a constructor that takes a Database as its only parameter.
It is recommended to have only one Dao class in your codebase for all tables.

Answer(s): D

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QUESTION: 54 Topic: KOTLIN only

By adding a RoomDatabase.Callback to the room database builder RoomDatabase.Builder (method
addCallback(RoomDatabase.Callback callback)), we can: (Choose two.)