Google Associate Android Developer Exam Dumps - Practice Questions - Post 46
1. The Log class allows you to create log messages that appear in logcat. Generally, you could use the following log methods: (Choose five.)
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Option A: Log.e(String, String) (error)
Option B: Log.a(String, String) (all outputs)
Option C: Log.w(String, String) (warning)
Option D: Log.i(String, String) (information)
Answer(s):
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2. Filter logcat messages. If in the filter menu, a filter option “Show only selected application”? means:
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Option A: Display the messages produced by the app code only (the default). Logcat filters the log messages using the PID of the active app.
Option B: Apply no filters. Logcat displays all log messages from the device, regardless of which process you selected.
Option C: Create or modify a custom filter. For example, you could create a filter to view log messages from two apps at the same time.
Answer(s):
Explanation: Not available
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3. Filter logcat messages. If in the filter menu, a filter option “Edit Filter Configuration”? means:
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Option A: Display the messages produced by the app code only (the default). Logcat filters the log messages using the PID of the active app.
Option B: Apply no filters. Logcat displays all log messages from the device, regardless of which process you selected.
Option C: Create or modify a custom filter. For example, you could create a filter to view log messages from two apps at the same time.
Answer(s):
Explanation: Not available
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4. The Layout Inspector in Android Studio allows you to compare your app layout with design mockups, display a magnified or 3D view of your app, and examine details of its layout at runtime. When this is especially useful?
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Option A: when your layout is built entirely in XML rather than runtime and the layout is behaving expectedly.
Option B: when your layout is built at runtime rather than entirely in XML and the layout is behaving unexpectedly.
Answer(s):
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5. If you want the Database Inspector to automatically update the data it presents as you interact with your running app, check the Live updates checkbox at the top of the inspector window. While live updates are enabled, what happens with the table in the inspector window?
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Option A: It is still editable. You can modify data in a table by double-clicking a cell, typing a new value, and pressing Enter.
Option B: It becomes read-only and you cannot modify its values.
Option C: It becomes read-only, but you cannot see its updated values before updating the data by clicking the Refresh table button at the top of the inspector window.
Answer(s):
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6. Enable debugging on your device: If you are using the emulator, this is enabled by default. But for a connected device, you need to
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Option A: enable transfer data from the device in usb connection options.
Option B: enable debugging in the device developer options.
Option C: enable connection in bluetooth options.
Answer(s):
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7. To run a debuggable build variant you must use a build variant that includes
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Option A: minifyEnabled false in the build configuration
Option B: debuggable true or debuggable false in the build configuration
Option C: debuggable true in the build configuration
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8. About running a debuggable build variant. Usually, you can just select the default "debug" variant that's included in every Android Studio project (even though it's not visible in the build.gradle file). But if you define new build types that should be debuggable, you must add ‘debuggable true’ to the build type. Is that mostly true?
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Option A: Yes.
Option B: No, if you define new build types that should be debuggable, you must add ‘debuggable false’
Option C: No, the debug variant should be visible in the build.gradle file anyway.
Answer(s):
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9. With a room database. When performing queries, you'll often want your app's UI to update automatically when the data changes. Can you use a return value of type LiveData in your query method description to achieve this?
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Option A: Yes
Option B: No
Answer(s):
Explanation:
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10. As an example. Our MutableLiveData object, named mLapseTime, is not connected to a Room database, etc. How can we change the value in mLapseTime?
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Option A: mLapseTime.postValue(“new String”)
Option B: mLapseTime.setValue(1000l)
Option C: mLapseTime.changeValue(1000l)
Answer(s):
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11. Interface for a callback to be invoked when a shared preference is changed. Interface is named:
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Option A: android.content.SyncStatusObserver
Option B: android.content.SharedPreferences.Editor
Option C: android.content.SharedPreferences.OnSharedPreferenceChangeListener
Option D: android.content.SharedPreferences
Answer(s):
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12. With our Context we can get SharedPreferences with a method, named: getSharedPreferences (String name, int mode). What value can we transfer in a “mode”parameter?
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Option A: MODE_PRIVATE or MODE_PUBLIC
Option B: combination of MODE_WORLD_READABLE and MODE_WORLD_WRITEABLE
Option C: Value is either 0 or a combination of MODE_PRIVATE, MODE_WORLD_READABLE, D. MODE_WORLD_WRITEABLE, and MODE_MULTI_PROCESS
Answer(s):
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13. What statements about InputStreamReader (java.io.InputStreamReader) are correct? (Choose two.)
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Option A: An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset. The charset that it uses may be specified by name or may be given explicitly, or the platform's default charset may be accepted.
Option B: An InputStreamReader is a bridge from character streams to byte streams: It reads characters using a specified charset and encodes them into bytes. The charset that it uses may be specified by name or may be given explicitly, or the platform's default charset may be accepted.
Option C: Each invocation of one of an InputStreamReader's read() methods may cause one or more bytes to be read from the underlying byte-input stream. To enable the efficient conversion of bytes to characters, more bytes may be read ahead from the underlying stream than are necessary to satisfy the current read operation.
Option D: No any invocation of one of an InputStreamReader's read() methods can cause some bytes to be read from the underlying byte-input stream.
Answer(s):
Explanation: Not available
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14. In a class extended PreferenceFragmentCompat. What method is used to inflate the given XML resource and add the preference hierarchy to the current preference hierarchy?
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Option A: findPreference
Option B: getPreferenceManager
Option C: addPreferencesFromResource
Option D: setPreferenceScreen
Answer(s):
Explanation: Not available
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15. In a class PreferenceFragmentCompat. What method is called during onCreate(Bundle) to supply the preferences for this fragment. And where subclasses are expected to call setPreferenceScreen (PreferenceScreen) either directly or via helper methods such as addPreferencesFromResource (int)?
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Option A: onCreateLayoutManager
Option B: onCreatePreferences
Option C: onCreateRecyclerView
Option D: onCreateView
Answer(s):
Explanation: Not available
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16. In a class PreferenceFragmentCompat. As a convenience, this fragment implements a click listener for any preference in the current hierarchy. So, in what overridden method we can handle that a preference in the tree rooted at this PreferenceScreen has been clicked?
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Option A: onCreateLayoutManager
Option B: onCreatePreferences
Option C: onCreateRecyclerView
Option D: onPreferenceTreeClick
Answer(s):
Explanation: Not available
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17. 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:
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Option A: commit()
Option B: apply()
Option C: commit() or apply()
Answer(s):
Explanation: Not available
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18. 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?
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Option A: delete(String key)
Option B: clear()
Option C: remove(String key)
Option D: removeAll()
Answer(s):
Explanation:
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19. What is the incorrect statement about Data Access Object (androidx.room.Dao)?
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Option A: Data Access Objects are the main classes where you define your database interactions. They can include a variety of query methods.
Option B: 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.
Option C: An abstract @Dao class can optionally have a constructor that takes a Database as its only parameter.
Option D: It is recommended to have only one Dao class in your codebase for all tables.
Answer(s):
Explanation: Not available
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20. By adding a RoomDatabase.Callback to the room database builder RoomDatabase.Builder (method addCallback(RoomDatabase.Callback callback)), we can: (Choose two.)
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Option A: set the database factory
Option B: handle database first time creation
Option C: handle database opening
Option D: disable the main thread query check for Room
Answer(s):
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21. By executing an allowMainThreadQueries() method to the room database builder RoomDatabase.Builder, we can:
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Option A: set the database factory
Option B: handle database first time creation
Option C: handle database opening
Option D: disable the main thread query check for Room
Answer(s):
Explanation: Not available
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22. Room can export your database's schema information into a JSON file at compile time. What annotation processor property you should set in your app/build.gradle file to export the schema?
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Option A: room.expandProjection
Option B: room.incremental
Option C: room.schemaLocation
Answer(s):
Explanation:
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23. If you added to your build.gradle file a room.schemaLocation: android { defaultConfig { javaCompileOptions { annotationProcessorOptions { arguments = ["room.schemaLocation": "$projectDir/schemas".toString()] } } } } Then, you build your app or module. As a result you got a json file, with such path to it: app/schemas/your_app_package/db_package/DbClass/DB_VERSION.json What are the correct statements about this file? (Choose all that apply.)
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Option A: It’s a file with Room-exported schema
Option B: Main JSONObject in this file usually should contain a number "formatVersion" and a JSONObject "database"
Option C: The JSONObject "database" in this file usually should contain such objects, like "entities", "views", "setupQueries", ets.
Answer(s):
Explanation:
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24. Select 3 major components of the Room. (Choose three.)
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Option A: @Entity
Option B: @Query
Option C: @RawQuery
Option D: @DAO
Answer(s):
Explanation: Not available
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25. With recommended app architecture. Fill the following diagram, which shows how all the modules usually should interact with one another after designing the app (drag modules to correct places). Select and Place: Exhibit A: Exhibit B:
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Option A: Please refer to Exhibit B for answer.
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26. A class that you create for managing multiple data sources. In addition to a Room database, this class could manage remote data sources such as a web server. It is about:
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Option A: Activity/Fragment
Option B: ViewModel
Option C: Repository
Option D: Room database
Answer(s):
Explanation: Not available
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27. The diagram below shows a basic form of the recommended architecture for apps that use Architecture Components. The architecture consists of a UI controller, a ViewModel that serves LiveData, a Repository, and a Room database. Drag modules to correct places. Select and Place: Exhibit A: Exhibit B:
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Option A: Please refer to Exhibit B for answer.
Answer(s):
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28. @Query is the main annotation used in DAO classes. It allows you to perform read/write operations on a database. Each @Query method is verified at compile time, so what happens if there is a problem with the query?
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Option A: a runtime error occurs instead of a compilation failure.
Option B: a compilation error occurs instead of a runtime failure.
Option C: both compilation error and runtime failure occurs.
Answer(s):
Explanation: Not available
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29. About queries in DAO classes. Room verifies the return value of the query such that if the name of the field in the returned object doesn't match the corresponding column names in the query response, Room alerts you in one of the following two ways: (Choose two.)
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Option A: It gives a warning if no field names match.
Option B: It gives a warning if only some field names match.
Option C: It gives an error if no field names match.
Option D: It gives an error if only some field names match.
Answer(s):
Explanation: Not available
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30. Select four different types of app components. (Choose four.)
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Option A: Application
Option B: Layouts
Option C: Activities
Option D: Services
Answer(s):
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