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Google Developers Certification - Associate Android Developer (Kotlin and Java Exam) Questions and Answers

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Viewing questions 21-30 out of questions

Questions # 21:

What happens when you create a DAO method and annotate it with @Insert?

Example:

@Dao

interface MyDao {

@Insert(onConflict = OnConflictStrategy.REPLACE)

fun insertUsers(vararg users: User)

}

Options:

Room generates an implementation that inserts all parameters into the database in a single transaction.

Room modifies a set of entities, given as parameters, in the database. It uses a query that matches against the primary key of each entity.

Room removes a set of entities, given as parameters, from the database. It uses the primary keys to find the entities to delete.

Answer

Questions # 22:

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:

Options:

commit()

apply()

commit() or apply()

Answer

Questions # 23:

For example, our preferences.xml file was added by addPreferencesFromResource (R.xml.preferences). Our preferences.xml file contains such item:

android:title="@string/pref_notification_title" android:summary="@string/pref_notification_summary" android:defaultValue="@bool/pref_notification_default_value" app:iconSpaceReserved="false"/>

In our Fragment, we can dynamically get current notification preference value in this way:

Options:

val isNotificationOn = PreferenceManager.getDefaultSharedPreferences (context).getBoolean(

context!!.getString(R.string.pref_notification_key), context!!.resources.getBoolean(R.bool.pref_notification_default_value)

)

val isNotificationOn = PreferenceManager.getSharedPreferences (context).getBoolean(

context!!.getString(R.string.pref_notification_default_value), context!!.getString(R.string.pref_notification_key),

)

val isNotificationOn = PreferenceManager.getSharedPreferences (context).getBoolean(

context!!.resources.getBoolean(R.bool.pref_notification_default_value), context!!.getString(R.string.pref_notification_key)

)

Answer

Questions # 24:

To run a debuggable build variant you must use a build variant that includes

Options:

minifyEnabled false in the build configuration

debuggable true or debuggable false in the build configuration

debuggable true in the build configuration

Answer

Questions # 25:

What is a correct part of an Implicit Intent for sharing data implementation?

Options:

val sendIntent = Intent(this, UploadService::class.java).apply { putExtra(Intent.EXTRA_TEXT, textMessage)

...

val sendIntent = Intent().apply { type = Intent.ACTION_SEND;

...

val sendIntent = Intent(this, UploadService::class.java).apply { data = Uri.parse(fileUrl)

...

val sendIntent = Intent().apply { action = Intent.ACTION_SEND

...

Answer

Explanation

Create the text message with a string

val sendIntent = Intent().apply { action = Intent.ACTION_SEND

putExtra(Intent.EXTRA_TEXT, textMessage) type = "text/plain"

}

[Reference:, https://developer.android.com/guide/components/fundamentals, ]

Questions # 26:

Filter logcat messages. If in the filter menu, a filter option “Edit Filter Configuration”? means:

Options:

Display the messages produced by the app code only (the default). Logcat filters the log messages using the PID of the active app.

Apply no filters. Logcat displays all log messages from the device, regardless of which process you selected.

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

Questions # 27:

Interface for a callback to be invoked when a shared preference is changed. Interface is named:

Options:

android.content.SyncStatusObserver

android.content.SharedPreferences.Editor

android.content.SharedPreferences.OnSharedPreferenceChangeListener

android.content.SharedPreferences

Answer

Questions # 28:

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?