Kotlin and Android From Scratch Practice Test

These questions are part of the practice quiz. Start practicing

• What is the name of the thread responsible for updating the screen in an Android app?
• What does the `lateinit` keyword do in Kotlin?
• What are the main differences between `ArrayList` and `List` in Kotlin?
• Which statement is true about abstract classes?
• What does the MutableLiveData class allow you to do?
• What happens if an abstract function is not implemented in a subclass?
• How do you define a variable in Kotlin that can only be assigned once?
• What is a key difference between a class and an instance?
• In which method should you handle the actions when a button in the app bar is pressed?
• What is a key benefit of class inheritance in programming?
• What is similar to a promise or future in other languages and serves as a placeholder for a return value?
• Which of the following can be serialized using Moshi?
• Which of the following is NOT a characteristic of Snackbar?
• What does `super.onCreate(savedInstanceState)` do in Android development?
• Which of the following is NOT a way to create a comment in Kotlin?
• How would you modify the main() function to print a 6-layer cake for a 4th birthday?
• What happens if you do not call `super.onCreate(savedInstanceState)` in an Activity?
• In most apps, would you create coroutines using the global scope?
• Which of the following is an example of a "constraint" in a ConstraintLayout?
• How can you serialize data in Kotlin?
• What does API level signify in the Android development environment?
• Which of the following are characteristics of a RESTful service?
• What is the purpose of Gradle in Android development?
• True or False: Retrofit creates the code required to make network requests based on a web service.
• What is the output type of the `observe` method in LiveData?
• In the fragment lifecycle, which task is performed in the onViewCreated() method?
• What is the primary use of the `ViewModel` in Android architecture components?
• What is the main purpose of a ViewGroup?
• Which of the following is true about Kotlin?
• Which of the following statements is false about async() and runBlocking() in Kotlin?
• Which statement is true about coroutines?
• Is it recommended to execute time-consuming tasks in your Activity/Fragment?
• What keyword is used to declare a property that can be initialized later in Kotlin?
• What type of data can a class property hold?
• What can you create multiple of from a single class in object-oriented programming?
• What is the function of the activity_main.xml file in an Android project?
• Which of the following best describes a Fragment in Android?
• What are characteristics of app icons for Android apps?
• Which function is needed to print output in Kotlin?
• What is a benefit of using fragments in Android development?
• How can you start a new activity in Kotlin?
• Which annotation is used to define a custom Binding Adapter?
• How do you define a data class in Kotlin?
• What step can be taken to change the color of your app's theme?
• What scope do coroutines run in by default?
• Which of the following are considered pitfalls of directly using threads in your code?
• What is a good reason for adding comments to your code?
• What is the role of a MoshiConverterFactory in Retrofit?
• What is the primary purpose of using Retrofit in Android?
• How do you define a variable in Kotlin?
• What does the KotlinJsonAdapterFactory() function do in relation to Moshi?
• Which component in Android provides lightweight feedback messages?
• Which of the following is NOT a density qualifier for Android icon resources?
• What is the correct purpose of the LiveData class in MVVM architecture?
• What is responsible for determining which thread is used behind the scenes by a coroutine?
• Which option correctly calls the function and passes valid input arguments?
• How do sealed classes work in Kotlin?
• How do you create a new Android project in Android Studio?
• What is a BroadcastReceiver in Android?
• What can you use to observe LiveData changes in Kotlin?
• In the context of ViewModels, what does 'survive configuration changes' mean?
• Which keywords are valid in conditional statements in Kotlin?
• When is a ViewModel destroyed?
• What class is typically used to customize the appearance of a Dialog in Android?
• What would you use to handle permissions in a modern Android application?
• Which of the following lifecycle methods can be called when the app returns to the foreground?
• What can lead to a memory leak in Android applications regarding ViewModels?
• What keyword is used in Kotlin to declare a suspended function?
• What is the main purpose of the `init` block in Kotlin?
• How can you restrict a property's access to only within its class?
• Which of the following statements correctly defines a variable in Kotlin?
• What is the purpose of the ActivityCompat class in Android?
• Which tasks can be performed in onCreate()?
• Which of the following statements about Retrofit is false?
• In Android, what is a graphic that can be drawn to the screen referred to as?
• What error may occur in improperly written XML code for a TextView?
• What is the function of an Intent in Android?
• Where do you specify dependencies in Android Studio?
• Which of the following is NOT a benefit of using grid layouts?
• What is the main purpose of using LiveData in Android applications?
• Which statement about binding adapters is correct?
• What is the correct order of activity lifecycle methods called when an app is opened and then exited using the back button?
• Which ViewType is used for creating a segmented view in Android?
• What is the Fragment in the context of Android development?
• Which method in Activity class is called when the activity is no longer visible to the user?
• How do you implement a RecyclerView Adapter in Kotlin?
• What does 'println()' do in Kotlin?
• Which of the following are Kotlin data types?
• Is it okay for a ViewModel to directly reference a View class?
• Why is the Material Components for Android library used?
• What does "Minimum SDK" refer to in an Android Studio project?
• Which statement is true regarding the navigation graph file in a note-taking app?
• If a function already calls a suspend function, must it be marked as a suspend function itself?
• What is the purpose of using a virtual device or emulator in Android Studio?
• How do you use Retrofit for network calls in Android?
• Which keyword is used to define a function in Kotlin?
• What does the await() function do when used with async in Kotlin?
• What is the role of the `by lazy` delegation in Kotlin?
• How does the apply function in Kotlin help in configuring an object?
• Which of the following are required to load and display an image with Coil?
• What does the 'fun' keyword represent in Kotlin?
• What do attributes such as textSize and textColor refer to in Android?
• What is the primary benefit of using LiveData in an Android app?
• What concept does a class represent in programming?
• What is the purpose of the AndroidManifest.xml file?
• What does IDE stand for in a development context?
• How can you handle errors in a coroutine?
• Which of the following are considered Attributes in Android? (Select all that apply)
• Is it true that onCreateView() is only called once for a fragment's entire lifecycle?
• Why is it beneficial to use string resources instead of hard-coded strings?
• What is the primary function of the `@BindingAdapter` annotation?
• What feature does Kotlin provide for handling nullable types?
• What is a program in computing?
• What does the 'override' keyword indicate when used in a subclass?
• What is the primary use of Shared Preferences in Android?
• How can you define custom attributes for a View in XML in Android?
• Which of the following accurately describes the purpose of a ViewModel in Android architecture?
• Which of the following describes how to create a new project in Android Studio?
• How can you initiate a long-running task in Kotlin?
• What type of ViewGroup helps arrange the views in a flexible way?
• What is an Android Service?
• What is the purpose of the `object` keyword in Kotlin?
• How can you create a custom Dialog in Android?
• In what scenario would you use Local Storage instead of Shared Preferences?
• What is the correct way to access the shared view model using the Kotlin property delegate approach?
• In Kotlin, how do you denote a comment in your code?
• What is primarily stored in the res/layout folder of an Android project?
• What format is typically used for defining resources in an Android application?
• Which statement about methods in relation to classes is true?
• Which statement accurately describes a conditional statement?
• Why should LiveData be initialized and stored in a ViewModel?
• In the URL https://google.com/search?q=android, what is '/search' classified as?
• Which method is typically used to inflate the UI for a fragment?
• What defines the specifics about a property in an object-oriented context?
• Which component helps to manage UI-related data lifecycle-consciously in Android?
• What does the lifecycle method onPause() signify in an activity?
• How do you handle lifecycle events in Android?
• What method should be overridden to manage back navigation in an Android Activity?
• What task should you perform in the onCreateView() method?
• How do you parse JSON in Kotlin using Kotlinx.serialization?
• True or False: Every MainActivity class in Android must have a main() function.
• What is the purpose of a constructor in a class?
• Which of the following elements is considered a View in an Android app?
• Which statement about XML layouts in Android is correct?
• What does the `override` keyword indicate in Kotlin?
• Which of the following is required for the Moshi library to successfully process JSON in Kotlin?
• Which task should NOT be done in the onCreateView() method?
• What does a class describe in object-oriented programming?
• What does observe allow you to monitor changes in?
• What is one key advantage of using binding adapters in Android development?
• In which scenario would the onStop() method be executed for an activity?
• Which of the following is another benefit of using string resources?
• Why is DataProviderManager declared with the object keyword?
• How is LiveData observed in an Activity?
• In Kotlin, what is the purpose of using data classes in relation to JSON processing?
• What is the primary purpose of Kotlin in Android development?
• Which activity lifecycle method is triggered when a dialog obscures an activity?
• What are Kotlin coroutines used for in Android?
• What is the purpose of a ViewModel in an Android application?
• Which of the following cannot be defined in an interface?
• How do you typically end a block comment in Kotlin?
• In what way does Kotlin handle nullability?
• What is the significance of null safety in Kotlin?
• How do you implement the ViewHolder pattern in RecyclerView?
• Which of the following can be classified as suspend functions?
• A Job in Kotlin is defined as what type of unit?
• What is an Activity in Android?
• What is a common use for the 'when' keyword in Kotlin?
• What does the method onDestroy() indicate about an activity?
• What does Retrofit primarily simplify in Android development?
• Which Kotlin feature allows extending existing classes without modifying them?
• What happens when the following code is executed if the intent property is null? val message = intent.extras?.getString("message").toString()
• Which of the following statements about Gradle is true?
• In Android, what does `adb` stand for?
• What is needed to make a network request with Retrofit?
• How do you create a custom View in Android?
• Which component is primarily responsible for managing UI in Kotlin Android applications?
• Which of the following statements about grid layouts is true?
• What are Kotlin extension functions?
• Match the HTTP request elements to their corresponding responses: Status Messages, Status Code, HTTP Verb, Content-Type
• Is it possible to use the same ViewModel for multiple Activities or Fragments to share data?
• Which of the following statements is false regarding intents?
• Which of the following is an example of a class?
• How can you declare a constant in Kotlin?
• What type of LiveData is used to return a different LiveData instance based on the value of another instance?
• Which of the following statements is true about the lifecycle of a single activity?
• How do you achieve dependency injection in Android with Dagger?
• How does the Android system handle configuration changes like screen rotations?
• What is the main purpose of a CoroutineScope in Kotlin?
• What is the difference between `MutableLiveData` and `LiveData`?
• What is the purpose of the `with` keyword in Kotlin?
• In Android, what is the primary function of an Adapter?
• What is the function of the `onCreate` method in an Activity?
• What is a primary benefit of using a project template in Android Studio?
• What is a Content Provider in the Android framework?
• What are reasons to use a ViewModel?
• In the context of data binding layout expression, what is the correct syntax for adding a click listener attribute to a button?
• What is the expected output of the given Kotlin code?
• Which method must be overridden in the host activity for fragment-based navigation?
• What does `apply` do in Kotlin?
• In Kotlin coroutines, what represents a lightweight thread?