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Basic Android MCQ

1. If you need your app code to inspect information about the current build, which class should you use?

BuildConfig

BuildInfo

ConfigParams

ConfigInfo

Answer

Correct Answer: BuildConfig

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2. You need to provide your users with certain features of your app on-demand or as instant experiences through Google Play. Which type of module should you create?

Library module

Dynamic feature module

Android app module

Google Cloud module

Answer

Correct Answer: Dynamic feature module

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3. What is the current recommended way to handle long-running background tasks?

WorkManager

AsyncTask

IntentService

Thread

Answer

Correct Answer: WorkManager

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4. To shrink your code in release builds, what tool does Android Studio use?

ProGuard

Shrinker

D8 Explanation: When you build your project using Android Gradle plugin 3.4.0 or higher, the plugin no longer uses ProGuard to perform compile-time code optimization. Instead, the plugin works with the R8 compiler to handle

Answer

Correct Answer: R8

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5. Which attribute of the element is used to specify the minimum API Level required for the application to run?

Android:targetSdkVersion

Android:minSdkVersion

Android:maxSdkVersion

None of the above

Answer

Correct Answer: Android:minSdkVersion

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6. What is the use of AndroidManifest.xml file?

It describes the component of the application

It declares the minimum level of the android API that the application requires

It facilitates to provide a uinque name for the application by specifying package name

All of the above

Answer

Correct Answer: It describes the component of the application

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7. You have created an AboutActivity class that displays details about your app. Which code snippet allows you to launch your activity?

Intent(this, AboutActivity::class).also { intent -> startService(intent) }

Intent(this, AboutActivity::class.java).also { intent -> startActivity(intent) }

Intent(this, AboutActivity::class).also { intent -> activity(intent) }

Intent(this, AboutActivity::class).also { intent -> startActivity(intent) } Explanation: Intent(Context packageContext, Class cls) Notice: Class not KClass

Answer

Correct Answer: Intent(this, AboutActivity::class.java).also { intent -> startActivity(intent) }

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8. What should you use to display a large, scrolling list of elements?

ListView

Recycler View

LinearLayout

Scrollview

Answer

Correct Answer: Recycler View

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9. Which component is not an entry point through which the system or a user can enter your app?

Activity

Content provider

Fragment

Service

Answer

Correct Answer: Fragment

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10. What is not a benefit of externalizing app resources such as image and string from a code?

It allows Android to choose the appropriate resource based on the current configuration during runtime.

It allows you to have more performant applications because the code and resources are separated.

It allows you to provide a different Ul experience based on the user's language settings.

It allows you to provide a different Ul experience based on the user's device size.

Answer

Correct Answer: It allows you to have more performant applications because the code and resources are separated.

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11. Which statement, in build.gradle file, correctly denotes that the corresponding module is an Android library module?

Apply plugin: 'com.module.library'

Apply plugin: 'com.android.library'

Apply plugin: 'com.module.library'

Include plugin: 'com.module.library'

Answer

Correct Answer: Apply plugin: 'com.android.library'

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12. When attempting to build your project, what might the following error indicate? Conversion to Dalvik format filed: Unable to execute dex: method ID not in [0, 0xffff]: 65536

You have included incorect format information in your build.gradle file.

You have added more than 20 dependencies to your build.gradle.

You have exceeded the total number of methods that can be referenced within a single DEX file.

You have a NullPointerException in your code.

Answer

Correct Answer: You have exceeded the total number of methods that can be referenced within a single DEX file.

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13. Given an APK named app-internal-debug.apk produced from the build process, which statement is likely to be true?

This APK is created on a developer machine from the debug product flavor.

This APK is created from the internalDebug product flavor.

This APK created from the debug product flavor and internal build type.

This APK is created from the debug build type and internal product flavor.

Answer

Correct Answer: This APK is created from the debug build type and internal product flavor.

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14. When should you use the androidTest directory to store your test classes?

When the tests consist only of unit tests.

When the number of tests to run is large(500+).

When the tests need to run on your local machine.

When the tests need to run on real or virtual devices.

Answer

Correct Answer: When the tests need to run on real or virtual devices.

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15. What folder should you use for your app's launcher icons?

/drawable

/icon

/mipmap

/launcher

Answer

Correct Answer: /mipmap

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16. Why do developers often put app initialization code in the Application class?

The Application class is instantiated before any other class when the process for the application is created.

The Application class is instantiated after any permissions requests when the process for the application is created.

The Application class is created each time a new Activity is launched, making it ideal for initialization code.

The Application class is created each time a background service is called, making it ideal for initialization code.

Answer

Correct Answer: The Application class is instantiated before any other class when the process for the application is created.

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17. You need to upgrade to the latest version of the Android Gradle plugin. Which file should you modify?

Root_project_dir/app/build.gradle.

Root_project_dir/settings.gradle.

Root_project_dir/build.gradle.

Root_project_dir/app/gradle.properties.

Answer

Correct Answer: Root_project_dir/build.gradle.

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18. Which layout is best for large, complex hierarchies?

LinearLayout

ConstraintLayout

FrameLayout

RelativeLayout

Answer

Correct Answer: ConstraintLayout

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19. What is _not_ a good way to reuse Android code?

Use a common Gradle module shared by different Android projects.

Prefer to build custom views or fragments over activities.

Prefer to build activities instead of fragments.

Break down UI layouts into common elements and use to include them in other layout XML files.

Answer

Correct Answer: Prefer to build activities instead of fragments.

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20. Which source set is _not_ available to you by default when Android Studio creates a new project?

Test

AndroidTest

App

Main

Answer

Correct Answer: Main

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21. You have built code to make a network call and tested that it works in your development environment. However, when you publish it to the Play console, the networking call fails to work. What will not help you troubleshoot this issue?

Checking whether ProGuard -keepclassmembers have been added to the network data transfer objects (DTOs) in question

Using the profiler tools in Android Studio to detect anomalies in CPU, memory, and network usage

Checking for exceptions in the server logs or server console

Checking that the network data transfer object has @SerizlizedName applied to its member properties

Answer

Correct Answer: Using the profiler tools in Android Studio to detect anomalies in CPU, memory, and network usage

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22. You want to allow users to take pictures in your app. Which is not an advantage of creating an appropriate intent, instead of requesting the camera permission directly?

Users can select their favorite photo apps to take pictures.

You do not have to make a permission request in your app to take a picture.

You have full control over the user experience. The app that handles the camera intent will respect your design choices.

You do not have to design the UI. The app that handles the camera intent will provide the UI.

Answer

Correct Answer: You have full control over the user experience. The app that handles the camera intent will respect your design choices.

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23. When should you store files in the /assets directory?

When you need access to the original file names and file hierarchy

When you need access to the file with its resource ID, like R.assets.filename

When you have XML files that define tween animations

When you need to access the file in its raw form using Resources.openRawResource()

Answer

Correct Answer: When you need access to the original file names and file hierarchy

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24. Why might you need to include the following permission to your app?

Android.permission.ACCESS_NETWORK_STATE

To monitor the location of the devices so that you don't attempt to make network calls when the user is stationary

To request the ability to make network calls from your app

To monitor the network state of the device so that you can display an in-app banner to the user

To monitor the network state of the devices so that you don't attempt to make network calls when the network is unavailable

Answer

Correct Answer: To monitor the network state of the devices so that you don't attempt to make network calls when the network is unavailable

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25. You want to provide a different drawable for devices that are in landscape mode and whose language is set to French. which directory is named correctly?

Fr-land-drawable

Drawable-fr-land

Drawable-french-land

French-land-drawable

Answer

Correct Answer: Drawable-fr-land

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26. What tag should you use to add a reusable view component to a layout file?

Answer

Correct Answer:

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27. Given the test class below, which code snippet would be a correct assertion?

AssertThat(resultAdd).is(2.0)

AssertNotNull(resultAdd)

AssertThat(resultAdd).isWqualTo(2.0)

AssertThat(resultAdd)

Answer

Correct Answer: AssertNotNull(resultAdd)

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28. You need to retrieve a list of photos from an API. Which code snippet defines an HTML GET request in Retrofit?

@GET("photo/{id}"} fun listPhotos(@Path("id") id:Long?) : Call

@LIST("photo") fun listPhotos() : Call

@GET("photo") fun listPhotos() : Call

Answer

Correct Answer: @GET("photo") fun listPhotos() : Call

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29. To persist a small collection of key-value data, what should you use?

External file storage

SharedPereferences

SQLite

Internal file storage

Answer

Correct Answer: SharedPereferences

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30. You need to get a list of devices that are attached to your computer with USB debugging enable. Which command would execute using the Android Debug Bridge?

List devices

Adb devices

List avd

Dir devices

Answer

Correct Answer: Adb devices

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31. How would you retrieve the value of a user's email from SharedPreferences while ensuring that the returned value is not null?

GetPreferances(this).getString(Email,

GetDefaultSharedPrefarances(this).getString(EMAIL,null)

GetDefaultSharedPreferances(this).getString(EMAIL,

GetPreferances(this).getString(EMAIL,null)

Answer

Correct Answer: GetDefaultSharedPreferances(this).getString(EMAIL,

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32. IF the main thread is blocked for too long, the system displays the _ dialog?

Thread Not Responding

Application Paused

Application Not Responding

Application Blocked

Answer

Correct Answer: Application Not Responding

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33. Given the definition below. how would you get access a TextView with an ID of text_home contained in thr layout file of a Fragment class?

Root.find(R.id.text_home)

FindViewById(R.id.text_home)

Root.getById(R.id.text_home)

Root.findViewById(R.id.text_home)

Answer

Correct Answer: Root.findViewById(R.id.text_home)

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34. What allows you to properly restore a user's state when an activity is restarted?

The onSaveInstance()method

All of these answers

Persistent storage

ViewModel objects

Answer

Correct Answer: All of these answers

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35. Why do you use the AndroidJUnitRunner when running UI tests? Notice: AndroidJUnitRunner lets us run JUnit3/4-style tests on Android Devices

The test runner facilitates loading your test package and the app under test onto a device or emulator, runs the test, and reports the results.

The test runner creating screenshots of each screen that displayed while tests are executed.

The test runner facilitates parallelization of test classes by providing for each test class.

The test runner facilitates interacting with visible elements on a device, regardless of the activity or fragment that has focus.

Answer

Correct Answer: The test runner facilitates loading your test package and the app under test onto a device or emulator, runs the test, and reports the results.

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36. You need to remove an Event based on it;s id from your API, Which code snippet defines that request in Retrofit?

@DELETE("events) fun deleteEvent(@Path("id") id: Long): Call

@DELETE("events/{id}") fun deleteEvent(@Path("id") id: Long): Call

@REMOVE("events/{id}") fun deleteEvent(@Path("id") id: Long): Call

@DELETE("events/{id}") fun deleteEvent(@Path("id") id: Long): Call

Answer

Correct Answer: @DELETE("events/{id}") fun deleteEvent(@Path("id") id: Long): Call
@DELETE("events/{id}") fun deleteEvent(@Path("id") id: Long): Call

Note: This question has more than 1 correct answers

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37. When will an activity's onActivityResult()be called?

When calling finish()in the parent activity

When placing an app into the background by sitching to another app

When onStop() is called in the target activity

When calling finish() in the target activity

Answer

Correct Answer: When calling finish() in the target activity

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38. What is the benifit of using @VisibleForTesting annotation?

To denote that a class, methos, or field has its visibility relaxed to make code testable

To denote that a class, method, or field is visible only in the test code

To denote that a class, method, or field has its visibility increased to make code less testable

To throw a run-time error if a class, methos, or field with this annotation is accessed improperly

Answer

Correct Answer: To denote that a class, methos, or field has its visibility relaxed to make code testable

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39. You want to include about and setting modules in your project. Which files accurately reflects their inclusion?

In build.gradle:include ':app',':about' ':settings'

In settings.gradle:include ':app',':about' ':settings'

In settings.gradle:include ':about',':settings'

In gradle.properties:include ':app',':about' ':settings'

Answer

Correct Answer: In settings.gradle:include ':app',':about' ':settings'

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40. You launch your app, and when you navigate to a new screen it crashes, Which action will NOT help you diagnose the issue?

Set breakpoints and then step through the code line by line

Use the profiler tools in Android Studio to detect anomalies CPU, and network usage.

Add a Thread.sleep() call before you start the new activity.

Inspect the logs in Logcat.

Answer

Correct Answer: Add a Thread.sleep() call before you start the new activity.

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41. Which XML attribute should be used to make an Image View accessible?

Android:talkBack

Android:labelFor

Android:hint

Android:contentDescription

Answer

Correct Answer: Android:contentDescription

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42. To add features, components, and permissions to your Android app, which file needs to be edited?

AndroidManifest.xml

Components.xml

AppManifest.xml

ComponentManifest.xml

Answer

Correct Answer: AndroidManifest.xml

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