Android - Linkedin Avaliações de competências

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linkedin-skill-assessments-quizzes
Android
Q1. To add features, components, and permissions to your Android app, which file needs to be
edited?
AndroidManifest.xml
Components.xml
AppManifest.xml
ComponentManifest.xml
Q2. Which XML attribute should be used to make an Image View accessible?
android:talkBack
android:labelFor
android:hint
android:contentDescription
Q3. 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.
Q4. Why might push notifications stop working?
all of these answers
The device token is not being sent to push provider correctly.
Google Play Services is not installed on the deivce/emulator.
Battery optimization is turned on on the device.
Q5. What is the correct set of component classes needed to implement a RecyclerView of
items that displays a list of widgets vertically?
[ ]
 RecycleView 
 RecyclerView.Adapter<T extends BaseAdapter> 
https://ebazhanov.github.io/linkedin-skill-assessments-quizzes/
 RecyclerView.ViewHolder<T extends BaseViewHolder> 
 LinearLayoutManager 
[ ]
 RecycleView 
 RecyclerView.Adapter 
 RecyclerView.ViewHolder<T extends BaseViewHolder> 
 LinearLayoutManager 
[ ]
 RecycleView 
 RecyclerView.Adapter 
 RecyclerView.ViewHolder 
 LinearLayoutManager 
[x]
 RecycleView 
 RecyclerView.Adapter<VH extends ViewHolder> 
 RecyclerView.ViewHolder 
 LinearLayoutManager 
Q6. The Android system kills process when it needs to free up memory. The likelihood of the
system killing a given process depends on the state of the process and the activity at the time.
With combination of process and activity state is most likely to be killed?
Process:In the background;Activity:Is stopped
Process:In the background;Activity:Is paused
Process:In the foreground;Activity:Is started
Process:In the foreground;Activity:Is paused
Q7. You have created a NextActivity class that relies on a string containing some data that
pass inside the intent Which code snippet allows you to launch your activity?
[ ]
 Intent(this, NextActivity::class.java).also { intent -> 
 startActivity(intent) 
 } 
[ ]
 Intent(this, NextActivity::class.java).apply { 
 put(EXTRA_NEXT, "some data") 
 }.also { intent -> 
 activityStart(intent) 
 } 
[x]
 Intent(this, NextActivity::class.java).apply { 
 putExtra(EXTRA_NEXT, "some data") 
 }.also { intent -> 
 startActivity(intent) 
 } 
[ ]
 Intent(this, NextActivity::class.java).apply { 
 put(EXTRA_NEXT, "some data") 
 }.also { intent -> 
 activityStart(intent) 
 } 
Q8. 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’
Q9. 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
Q10. How would you specify in your build.gradle file that your app required at least API level
21 to run, but that it can be tested on API level 28?
[ ]
 defaultConfig { 
 ... 
 minApiVersion 21 
 targetApiVersion 28 
 } 
[ ]
 defaultConfig { 
 ... 
 targetSdkVersion 21 
 testSdkVersion 28 
 } 
[ ]
 defaultConfig { 
 ... 
 minSdkVersion 21 
 testApiVersion 28 
 } 
[x]
 defaultConfig { 
 ... 
 minSdkVersion 21 
 targetSdkVersion 28 
 } 
Q11. 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
For more information
Q12. 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
https://developer.android.com/reference/android/app/Activity
@REMOVE(“events/{id}”) fun deleteEvent(@Path(“id”) id: Long): Call
@DELETE(“events/{id}”) fun deleteEvent(@Path(“id”) id: Long): Call
Q13. When would you use a product flavour in your build setup?
when you need to have the app’s strings present in multiple lanuages
when you have to provide different versions of your app based on the physical device size
when you want to provide different versions of your app based on the device screen
density
when you want to provide different version of your app with custom configuration and
resources
Q14. Given the fragment below, how would you get access to a TextView with an ID of
text_home contained in the layout file of a Fragment class?
 private lateinit var textView: TextView 
 override fun onCreateView(...): View? { 
 val root = inflator.inflator(R>layout.fragment_home, container, false) 
 textView = ?? 
 return root 
 } 
root.getById(R.id.text_home)
findViewByID(R.id.text_home)
root.findViewById(R.id.text_home)
root.find(R.id.text_home)
Q15. 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.
Q16. 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
Refrence
Q17. 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)
Q18. IF the main thread is blocked for too long, the system displays the _ dialog?
Thread Not Responding
Application Paused
Application Not Responding
Application Blocked
Q19. 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)
Explanation: In Method “getDefaultSharedPrefarances(this).getString()” Second parameter is
passed so that it can be returned, in case key doesn’t exist. So we need to pass an empty string
to be returned in case key doesn’t exist.
Q20. Why is it problematic to define sizes using pixels on Android?
Although screen pixel density varies, this does not impact the use of pixels to define sizes.
Large devices always have more pixels, so your UI elements will be e=affected if you
define them with pixels.
The same number ofpixels may correspond to different physical sizes, affecting the
appearance of your UI elements.
Different devices have different understanding of what a pixel is , affecting the appearance
of your UI elements
Reference
Q21. 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?
https://developer.android.com/topic/libraries/architecture/saving-states
https://developer.android.com/training/multiscreen/screendensities#:~:text=The%20first%20pitfall%20you%20must,physical%20sizes%20on%20different%20devices.
list devices
adb devices
list avd
dir devices
Q22. Which drawable definition allows you to achieve the shape below?
[ ]
 xml 
 <shape xmlns:android="http://schemas.android.com/apk/res/android" 
 android:shape="oval"> 
 <stroke 
 android:width="4dp" 
 android:color="@android:color/white" /> 
 <solid android:color="@android:color/black" /> 
 </shape> 
[ ]
 xml 
 <oval xmlns:android="http://schemas.android.com/apk/res/android"> 
 <stroke android:width="4dp" android:color="@android:color/black"/> 
 <solid android:color="@android:color/white"/> 
 </oval> 
[x]
 xml 
 <shape xmlns:android="http://schemas.android.com/apk/res/android" 
 android:shape="oval"> 
 <stroke 
 android:width="4dp" 
 android:color="@android:color/black" /> 
 <solid android:color="@android:color/white" /> 
 </shape> 
[ ]
 xml 
 <shape xmlns:android="http://schemas.android.com/apk/res/android" 
 android:shape="oval"> 
 <stroke 
 android:width="4dp" 
 android:color="@android:color/white" /> 
 <solid android:color="@android:color/white" /> 
 </shape> 
Q23. To persist a small collection of key-value data, what should you use?
external file storage
SharedPereferences
SQLite
internal file storage
Q24. 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<List>
@GET(“photo”) fun listPhotos() : Call
@GET(“photo”) fun listPhotos() : Call<List>
Q25. 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)
Q26. What tag should you use to add a reusable view component to a layout file?
<merge/>
<include/>
<layout/>
<add/>
Q27. 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
Q28. 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
Q29. Which image best corresponds to the following LinearLayout ?
 xml 
 <LinearLayout 
 android:layout_width="match_parent" 
 android:layout_height="match_parent"
 android:orientation="horizontal" 
 android:gravity="center"> 
 <Button 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content" 
 android:text="Button" /> 
 <Button 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content" 
 android:text="Button" /> 
 </LinearLayout> 
A
B
C
D
Q30. You want to open the default Dialer app on a device. What is wrong with this code?
val dialerIntent = Intent() 
val et = findViewById(R.id.some_edit_text) 
dialerIntent.action = Intent.ACTION_DIAL 
dialerIntent.data = Uri.parse("tel:" + et.getText()?.toString()) 
startActivity(dialerIntent) 
startActivityWithResult() should be used instead of startActivity() when using
Intent.ACTION_DIAL .
For Intent.ACTION_DIAL , the Intent option Intent.FLAG_ACTIVITY_NEW_TASK must be
added when using this dialerIntent .
The dialerIntent will cause an ActivityNotFoundException to be thrown on devices that
do not support Intent.ACTION_DIAL .
The permission android.permission.CALL_PHONE must be requested first before
Intent.ACTION_DIAL can be used.
Q31. When should you store files in the /assets directory?
when you need access to the original file names and file hierarchy (Reference)
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()
Q32. 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.
Q33. When would you use the
ActivityCompat.shouldShowRequestPermissionRationale() function?
when a user first opens your app and you want to provide an explanation for the use of a
given permission
when a user has previously denied the request for a given permission and selects “Tell me
more”
when a user has previously denied the request for a given permission and you want to
provide an explanation for its use
when a user has previously denied the request for a given permission and selected “Don’t
ask again,” but you need the permission for your app to function
Q34. You would like to enable analytics tracking only in release builds. How can you create
a new field in the generated BuildConfig class to store that value?
[ ]
https://medium.com/mobile-app-development-publication/assets-or-resource-raw-folder-of-android-5bdc042570e0
buildTypes { 
 debug { 
 buildConfig 'boolean', 'ENABLE_ANALYTICS', 'false' 
 } 
 release { 
 buildConfig 'boolean', 'ENABLE_ANALYTICS', 'true' 
 } 
} 
[ ]
buildTypes { 
 debug { 
 buildConfig 'String', 'ENABLE_ANALYTICS', 'false' 
 } 
 release { 
 buildConfig 'String', 'ENABLE_ANALYTICS', 'true' 
 } 
} 
[x]
buildTypes { 
 debug { 
 buildConfigField 'boolean', 'ENABLE_ANALYTICS', 'false' 
 } 
 release { 
 buildConfigField 'boolean', 'ENABLE_ANALYTICS', 'true' 
 } 
} 
[ ]
buildTypes { 
 debug { 
 buildConfigField 'boolean', 'ENABLE_ANALYTICS', 'true' 
 } 
 release { 
 buildConfigField 'boolean', 'ENABLE_ANALYTICS', 'false' 
 } 
} 
Q35. To optimize your APK size, what image codec should you use?
JPG
PNG
MPEG
WebP (Reference)
Q36. 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
Q37. Which code snippet would achieve the layout displayed below?
[ ]
xml 
 <androidx.constraintlayout.widget.ConstraintLayout 
 ...> 
 <TextView 
 android:id="@+id/text_dashboard" 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content"android:layout_marginTop="16dp" 
https://developer.android.com/topic/performance/reduce-apk-size#:~:text=packJPG%20and%20guetzli.-,Use%20WebP%20file%20format,than%20either%20JPEG%20or%20PNG.
 android:padding="8dp" 
 android:textAlignment="center" 
 android:text="Dashboard" 
 app:layout_constraintEnd_toEndOf="parent" 
 app:layout_constraintStart_toStartOf="parent" 
 app:layout_constraintTop_toTopOf="parent" /> 
 </androidx.constraintlayout.widget.ConstraintLayout> 
[x]
xml 
 <androidx.constraintlayout.widget.ConstraintLayout 
 ...> 
 <TextView 
 android:id="@+id/text_dashboard" 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content" 
 android:layout_marginStart="8dp" 
 android:layout_marginEnd="8dp" 
 android:textAlignment="center" 
 android:text="Dashboard" 
 app:layout_constraintEnd_toEndOf="parent" 
 app:layout_constraintStart_toStartOf="parent" 
 app:layout_constraintTop_toTopOf="parent" /> 
 </androidx.constraintlayout.widget.ConstraintLayout> 
[ ]
xml 
 <androidx.constraintlayout.widget.ConstraintLayout 
 ...> 
 <TextView 
 android:id="@+id/text_dashboard" 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content" 
 android:layout_marginStart="8dp" 
 android:layout_marginTop="16dp" 
 android:layout_marginEnd="8dp" 
 android:padding="8dp" 
 android:textAlignment="center" 
 android:text="Dashboard" 
 app:layout_constraintEnd_toEndOf="parent" 
 app:layout_constraintStart_toStartOf="parent" 
 app:layout_constraintTop_toTopOf="parent" /> 
 </androidx.constraintlayout.widget.ConstraintLayout> 
[ ]
xml 
 <androidx.constraintlayout.widget.ConstraintLayout 
 ...> 
 <TextView 
 android:id="@+id/text_dashboard" 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content" 
 android:layout_marginStart="8dp" 
 android:layout_marginTop="16dp" 
 android:layout_marginEnd="8dp" 
 android:padding="8dp" 
 android:text="Dashboard" 
 app:layout_constraintEnd_toEndOf="parent" 
 app:layout_constraintStart_toStartOf="parent" 
 /> 
</androidx.constraintlayout.widget.ConstraintLayout> 
Q38. Which source set is _not_ available to you by default when Android Studio creates a
new project?
test
androidTest
app
main
Q39. Which definition will prevent other apps from accessing your Activity class via an
intent ?
[x]
xml 
 <activity android:name=".ExampleActivity" /> 
[ ]
xml 
 <activity android:name=".ExampleActivity"> 
 <intent-filter> 
 <action android:name="android.intent.action.SEND" /> 
 </intent-filter> 
 </activity> 
[ ]
xml 
 <activity android:name=".ExampleActivity"> 
 <intent-filter> 
 <action android:name="android.intent.action.MAIN" /> 
 <category android:name="android.intent.category.LAUNCHER" /> 
 </intent-filter> 
 </activity> 
[ ]
xml 
 <activity android:name=".ExampleActivity"> 
 <intent-filter> 
 <action android:name="android.intent.action.VIEW" /> 
 </intent-filter> 
 </activity> 
Explanation: Intent filters are used to make activities accessible to other apps using intents. So
we have to choose option which have no intent filter to make sure it is not accessible by intent
Q40. To preserve on-device memory, how might you determine that the user’s device has
limited storage capabilities?
Use the ActivityManager.isLowRamDevice() method to find out whether a device defines
itself as “low RAM.”
Use the Activity.islowRam() method to find out whether a device defines itself as “low
RAM.”
Use the ConnectivityManager.hasLowMemory() method to find out whether a device
defines itself as “low RAM.”
Make an image download request and check the remaining device storage usage.
Q41. 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 <include/> to include them in
other layout XML files.
Q42. Which layout is best for large, complex hierarchies?
LinearLayout
ConstraintLayout
FrameLayout
RelativeLayout
Q43. 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.
reference
Q44. 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.
reference
Q45. What folder should you use for your app’s launcher icons?
/drawable
/icon
/mipmap
/launcher
Q46. Which drawable definition allows you to achieve the shape below?
https://developer.android.com/studio/releases/gradle-plugin#updating-plugin
https://developer.android.com/reference/android/app/Application
[ ]
xml 
 <shape xmlns:android-"http://schemas.android.com/apk/res/android" 
 android:shape-"oval"> 
 <gradient 
 android:startColor-"@android:color/white" 
 android:endColor-"@android:color/black" 
 android:angle-"45"/> 
 </shape> 
[ ]
xml 
 <rectangle xmlns:android-"http://schemas.android.com/apk/res/android"> 
 <gradient 
 android:startColor-"@android:color/white" 
 android:endColor-"android:color/black" 
 android:angle-"135"/> 
 </rectangle> 
[x]
xml 
 <shape xmlns:android-"http://schemas.android.com/apk/res/android" 
 android:shape-"rectangle"> 
 <gradient 
 android:startColor-"@android:color/white" 
 android:endColor-"@android:color/black" 
 android:angle-"135"/> 
 </shape> 
[ ]
xml 
 <shape xmlns:android-"http://schemas.android.com/apk/res/android" 
 android:shape-"rectangle"> 
 <gradient 
 android:startColor-"@android:color/white" 
 android:endColor-"@android:color/black" 
 android:angle-"98"/> 
 </shape> 
Q47. Given the ConstraintLayout below, which statement is true?
View B is not horizontally constrained.
View C has too many constraints.
View B is not vertically constrained.
View C is constrained to the parent.
Q48. Given this code snippey from a build.gradle file, which choice is not a possible build
variant?
android { 
 ... 
 defaultConfig{...} 
 buildTypes{ 
 debug{...} 
 releasae{...} 
} 
 flavorDimensions "environment" 
 productFlavors { 
 producation {...} 
 staging {...} 
 } 
} 
productionDebug.
developmentDebug.
stagingDebug.
stagingRelease.
Reference
Q49. 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.
Reference
Q50. 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.
Q51. 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.
https://developer.android.com/studio/build/build-variants#flavor-dimensions
https://developer.android.com/studio/test#test_types_and_locationYou have exceeded the total number of methods that can be referenced within a single
DEX file.
You have a NullPointerException in your code.
Q52. 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’
Q53. Given the following dimens.xml file, how would you define an ImageView with medium
spacing at the bottom?
<?xml version=1.0 encoding="utf-8"?> 
<resources> 
 <dimen name="spacing_medium">8dp</dimen>
 <dimen name="spacing_large">12dp</dimen>
</resources> 
[ ]
<ImageView 
 android:id=@+id/image_map_pin" 
 android:layout_width="wrap_content" 
 android:layout_heignt="wrap_content" 
 android:src=@drawable/map_pin /> 
[ ]
 android:id=@+id/image_map_pin" 
 android:layout_width="wrap_content" 
 android:layout_heignt="wrap_content" 
 androi:layout_botttom="@dimen/spacing_medium" 
 android:src=@drawable/map_pin /> 
[ ]
<ImageView 
 android:id=@+id/image_map_pin" 
 android:layout_width="wrap_content" 
 android:layout_heignt="wrap_content" 
 android:layout_marginBottom="@resources/spacing_medium" 
 android:src=@drawable/map_pin /> 
[x]
<ImageView 
 android:id=@+id/image_map_pin" 
 android:layout_width="wrap_content" 
 android:layout_heignt="wrap_content" 
 android:layout_marginBottom="@dimen/spacing_medium" 
 android:src=@drawable/map_pin /> 
Q54. 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.
Q55. What is the chief purpose of line five in this code snippet?
override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) se
 if (savedInstanceState != null) return 
 val fragment = CreatePostFragment() 
 supportFragmentManager 
 .beginTransaction() 
 .add(R.id. fragment_container, fragment) 
 .commit() 
} 
to make sure that the activity finishes when the savedInstanceState is not null
to make sure that the activity creates a new fragment each time it is restored from a
previous state
to prevent the display of two fragments side by side in cases where the activity is restored
from a previous state
to prevent the creation of overlapping fragments in cases where the activity is restored
from a previous state
Q56. Which component is not an entry point through which the system or a user can enter
your app?
activity
content provider
fragment
service
Q57. What should you use to display a large, scrolling list of elements?
ListView
Recycler View
LinearLayout
Scrollview
Q58. 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
Q59. 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
Q60. 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
Q61. To shrink your code in release builds, what tool does Android Studio use?
R8
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
Reference
Q62. Which layout hierarchy is likely to be drawn the most quickly?
A
B
https://developer.android.com/studio/build/shrink-code
C
D
Q63. What is the current recommended way to handle long-running background tasks?
WorkManager
AsyncTask
IntentService
Thread
Reference
Q64. 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?
https://developer.android.com/guide/background
library module
dynamic feature module
Android app module
Google Cloud module
1. Reference
2. Reference
Q65. Which approach is not recommended for providing a useful offline state in your app?
caching data
storing data locally
queuing outbound requests to action when connectivity has been lost
always notifying users that connectivity has been lost
Reference
Q66. If you need your app code to inspect information about the current build, which class
should you use?
BuildConfig
BuildInfo
ConfigParams
ConfigInfo
Q67. In the ConstraintLayout below, why wouldn’t button expand to fill the width of parent?
 xml 
 <androidx.constraintlayout.widget.ConstrantLayout 
 ...> 
 <Button 
 android:layout_width="0dp" 
 android:layout_height="wrap_content" 
 android:text="Button" 
 app:layout_constraintStart_toStartOf="parent" 
 app:layout_constraintTop_toTopOf="parent"/> 
 </androidx.constraintlayout.widget.ConstrantLayout> 
The button does not have a size
The button is not constrained to the end of the parent container
Buttons cannot expand beyond their default size
The button should have its height set to 0dp as well
https://youtu.be/QdfStuj-MuA?t=86
https://developer.android.com/guidgite/playcore/feature-delivery/on-demand
https://developer.android.com/docs/quality-guidelines/build-for-billions/connectivity#network-offline
Q68. What is not a use case for idling resources in your Espresso tests?
managing system services
processing user input events
loading data from the internet or a local data source
perfoming bitmap transformatinos
Q69. What is not a type of resource for providing your app with strings?
String
Text
String-array
Plurals
Q70. What is not in the activity lifecycle?
onPause()
onResume()
onOpen()
onStart()
Q71. You want to allow users to take a picture in your app. Which code snippet is the correct
approach?
[ ]
 fun showCamera(view: View) { 
 Log.i(TAG, "Show camera button pressed.") 
 if (ContextCompat.shouldShowRequestPermissionRationale(thisActivity, 
 Manifest.permission.CAMERA) { 
 showCameraPreview() 
 } 
 else { 
 requestPermissionLauncher.launch(Manifest.permission.CAMERA) 
 } 
 } 
[x]
 fun showCamera(view: View) { 
 Log.i(TAG, "Show camera button pressed.") 
 if (ContextCompat.checkSelfPermission(thisActivity, 
 Manifest.permission.CAMERA) 
 == PackageManager.PERMISSION_GRANTED) { 
 showCameraPreview() 
 } 
 else { 
 requestPermissionLauncher.launch(Manifest.permission.CAMERA) 
 } 
 } 
[]
 fun showCamera(view: View) { 
 Log.i(TAG, "Show camera button pressed.") 
 showCameraPreview() 
 } 
[ ]
 fun showCamera(view: View) { 
 Log.i(TAG, "Show camera button pressed.") 
 if (ContextCompat.checkSelfPermission(thisActivity, 
 Manifest.permission.CAMERA) 
 != PackageManager.PERMISSION_GRANTED) { 
 showCameraPreview() 
 } 
 else { 
 requestPermissionLauncher.launch(Manifest.permission.CAMERA) 
 } 
 } 
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