Android App Architecture Quiz
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Questions and Answers

What is one purpose of using fragments in Android applications?

  • Restricts UI customization
  • Enables simplified navigation (correct)
  • Decreases app performance
  • Increases device storage

    • Which of the following correctly describes an explicit intent?

  • It broadcasts messages to other applications
  • It starts a service without specifying details
  • It communicates without focusing on a target
  • It launches a specific component within an application (correct)

    • What is a characteristic of implicit intents?

  • They allow inter-app communication without specific targeting (correct)
  • They can only start activities within the same app
  • They are solely used for background operations
  • They require a specific component to be declared

    • Which statement about intents is inaccurate?

    <p>Intents are only for starting activities</p> Signup and view all the answers

    What is NOT a benefit of using fragments in Android apps?

    <p>Reduced memory usage</p> Signup and view all the answers

    What does Mobile App Architecture refer to?

    <p>The structure of an app’s core elements.</p> Signup and view all the answers

    How does Mobile App Architecture impact an app?

    <p>It affects performance, maintainability, and scalability.</p> Signup and view all the answers

    Which architecture pattern is commonly used in Android development?

    <p>MVVM or Clean Architecture.</p> Signup and view all the answers

    What is the primary purpose of the onCreate method in the Android Activity Lifecycle?

    <p>To initialize the Activity's components and UI.</p> Signup and view all the answers

    What happens during the onResume stage of the Android Activity Lifecycle?

    <p>The Activity gains focus and becomes interactive.</p> Signup and view all the answers

    What is one of the key actions performed in the onPause method?

    <p>Stopping animations and saving data.</p> Signup and view all the answers

    Which of the following accurately describes the onStart method?

    <p>It registers resources that are needed every time the Activity becomes visible.</p> Signup and view all the answers

    What does the Android Activity Lifecycle manage?

    <p>User interactions and resource handling.</p> Signup and view all the answers

    What is the purpose of the onStop() method?

    <p>It is called when the Activity is no longer visible.</p> Signup and view all the answers

    When is the onRestart() method invoked?

    <p>When an Activity is launched from the Recent Apps menu.</p> Signup and view all the answers

    What should be done in the onDestroy() method?

    <p>Clean up any remaining resources and end background tasks.</p> Signup and view all the answers

    Which lifecycle method is called immediately after an Activity is created?

    <p>onStart()</p> Signup and view all the answers

    In which method would you typically handle background tasks?

    <p>onDestroy()</p> Signup and view all the answers

    What occurs during the onPause() method?

    <p>The Activity is visible to the user but partially obscured.</p> Signup and view all the answers

    Which method is crucial for initializing resources released in onStop()?

    <p>onStart()</p> Signup and view all the answers

    What is an Activity in the context of Android applications?

    <p>A single screen with user interface elements.</p> Signup and view all the answers

    What method is used to start a new activity with a specific action?

    <p>startActivity()</p> Signup and view all the answers

    How is data passed to another activity in Android?

    <p>Using putExtra() method</p> Signup and view all the answers

    What happens if savedInstanceState is null during the onCreate method?

    <p>The initial fragment is set up</p> Signup and view all the answers

    Which method replaces the current fragment with a new fragment in the ListFragment?

    <p>getParentFragmentManager().replace()</p> Signup and view all the answers

    What is the purpose of addToBackStack(null) in fragment transactions?

    <p>To allow the user to navigate back to the previous fragment</p> Signup and view all the answers

    In the given code, what is the first action taken in the MainActivity?

    <p>Inflating a layout</p> Signup and view all the answers

    Which method is called to register a click listener on the details button in ListFragment?

    <p>setOnClickListener()</p> Signup and view all the answers

    What class does ListFragment extend in the given example?

    <p>Fragment</p> Signup and view all the answers

    What is the primary function of an Activity in an Android app?

    <p>To serve as a single screen with a user interface</p> Signup and view all the answers

    Which lifecycle method is called when an Activity is first created?

    <p>onCreate()</p> Signup and view all the answers

    What happens during the onPause() lifecycle method of an Android Activity?

    <p>The Activity is partially visible but not fully interactive</p> Signup and view all the answers

    How do Fragments enhance the design of an Android app?

    <p>They can be reused and embedded within Activities</p> Signup and view all the answers

    What is typically displayed by a Home Activity in an Android app?

    <p>List of news articles</p> Signup and view all the answers

    Which statement best describes the relationship between Activities and the entry point of an Android app?

    <p>An app starts at its main Activity as the entry point</p> Signup and view all the answers

    In what situation would an Activity call onDestroy()?

    <p>When the Activity is no longer visible</p> Signup and view all the answers

    Which of the following best describes a Fragment in an Android application?

    <p>A reusable portion of an app's user interface</p> Signup and view all the answers

    Signup and view all the answers

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    Study Notes

    Mobile App Architecture

    • Mobile app architecture is the structure of an app's core elements, including data, presentation, and navigation.

    Why Mobile App Architecture?

    • Mobile app architecture affects app performance, maintainability, and scalability.
    • Architecture differs by platform (Android and iOS). Android uses MVVM or Clean Architecture, while iOS uses MVC or MVVM.

    Android Activity Lifecycle

    • The Android activity lifecycle manages user interactions and resource handling.
    • Examples of interactions include pausing an activity during a phone call.

    Android Activity Lifecycle Stages and Methods

    • onCreate(): Called when an activity is first created. This involves initializing the activity, setting up the UI, binding data, and initializing components.
    • onStart(): Called after onCreate, making the activity visible to the user, but not yet the front. This sets up things needing to be re-initiated whenever the activity becomes visible, such as receivers or animations.
    • onResume(): Called when the activity gains focus and becomes interactive. This starts updates needing to occur while the activity is active, like animations, UI refreshes, or data updates.
    • onPause(): Occurs when the activity is partially blocked, such as a dialog appearing or the user navigating away. Pauses updates, animations, or audio, saves data, and commits changes.
    • onStop(): Called when the activity is no longer visible, often when the user opens a new activity.
    • onRestart(): Called if an activity is stopped and then restarted. Useful for re-initializing resources released during onStop.
    • onDestroy(): The final method called before the activity is destroyed, either due to user or system actions. Resources are cleaned up, background tasks end, and final persistence is handled.

    Components of Android Apps - Activities

    • An activity is a single screen with a user interface (e.g., a web page).
    • Examples of activities include a news feed, document editor, and map navigator.
    • Another example of an activity is the home activity that shows a list of news articles, a detail activity that shows the content of a selected article, and a settings activity allowing users to configure app settings.

    Purpose of Activities

    • Displays the user interface for user interaction.
    • Handles user input and responds to touch, keyboard, or system events.
    • Manages transitions between different screens within an app.
    • Is the entry point to the app. When launching an app, it starts with its main activity.

    Activity Lifecycle

    • onCreate(): Called when the Activity is first created.
    • onStart(): The Activity becomes visible to the user, but not in the foreground.
    • onResume(): The Activity becomes interactive in the foreground.
    • onPause(): The Activity is about to lose focus, is partially visible, but not fully interactive.
    • onStop(): The Activity is no longer visible, with another Activity now visible.
    • onDestroy(): Occurs before the Activity is removed from memory.

    Components of Android Apps - Fragments

    • A fragment represents a reusable portion of an app's user interface within an activity.
    • Fragments are designed to be embedded within an activity, taking part or all of its screen.
    • Fragments enable a modular UI design, often reusable across screens or sections of an app.
    • Examples include displaying a list of articles in a news app, or displaying the details of the selected article.

    Purpose of Fragments

    • Enables reusability.
    • Allows dynamic UI design.
    • Simplifies navigation.
    • Provides lifecycle awareness.

    Components of Android Apps - Intents

    • An intent is an abstract description of an operation to be performed.
    • Intents enable Android apps to perform various tasks: launching new activities, starting services for background tasks, broadcasting messages to other apps, receiving or passing data between components.

    Types of Intents

    • Explicit Intent: Used to launch a specific component (activity or service) within the same application.
    • Implicit Intent: Doesn't specify a target component, facilitating communication between different applications.

    Passing Data with Intent Extras

    • Enables passing data between activities using intent extras; one example includes passing a username (string) between two specific activities.

    Implementing Activities and Fragments in Android

    • Demonstrates how to implement activities and fragments within an Android application, including examples that show creating activities, implementing fragments, using buttons, and navigation.

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    Related Documents

    Mobile App Architecture PDF

    Description

    Test your knowledge on mobile app architecture focusing on Android. This quiz covers key concepts such as the Android activity lifecycle, architecture patterns, and their impact on app performance. Understand the various stages and methods involved in managing activities.

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