Mobile App Architecture and Android Lifecycle
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Questions and Answers

What is one primary purpose of using fragments in Android applications?

  • Reusability (correct)
  • Enhancing security protocols
  • Increasing app memory usage
  • Reducing user interface complexity

    • Which type of intent is used to launch a specific component within the same application?

  • Implicit Intent
  • Explicit Intent (correct)
  • Service Intent
  • Broadcast Intent

    • What does an Implicit Intent allow in Android applications?

  • To communicate between different applications (correct)
  • To perform scheduled tasks
  • To specify the exact component to launch
  • To start a background service

    • Which of the following is NOT a component of Android app intents?

    <p>Binding services to activities</p> Signup and view all the answers

    Which aspect of fragments enhances user experience by allowing lifecycle awareness?

    <p>Dynamic UI Design</p> Signup and view all the answers

    What is the primary purpose of Mobile App Architecture?

    <p>To structure the app's core elements</p> Signup and view all the answers

    Which architectures are commonly used for Android applications?

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

    During which lifecycle stage is the Activity first created?

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

    What happens when the onPause() method is called in an Android Activity?

    <p>Data is saved and changes are committed</p> Signup and view all the answers

    Which lifecycle stage precedes the onResume() method?

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

    In which lifecycle method should you set up UI components and initialize data?

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

    What is the main function of the onStart() method?

    <p>To make the Activity visible to the user</p> Signup and view all the answers

    What should be done when onPause() is called to maintain app performance?

    <p>Pause updates and save important data</p> Signup and view all the answers

    What is the purpose of an Activity in an Android app?

    <p>To display a user interface for user interaction</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 does the onPause() lifecycle method signify about the Activity?

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

    How do Fragments enhance UI design in Android apps?

    <p>By enabling reusable portions of UI within an Activity</p> Signup and view all the answers

    Which of the following best describes the relationship between Activities and Fragments?

    <p>Each Activity contains one or more Fragments</p> Signup and view all the answers

    What is the purpose of the onStop() method in the Android activity lifecycle?

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

    What happens during the onStop() lifecycle method?

    <p>The Activity is no longer visible to the user</p> Signup and view all the answers

    Which of the following describes an example of an Activity?

    <p>The screen that allows users to view their account settings</p> Signup and view all the answers

    When is the onRestart() method called in the activity lifecycle?

    <p>When the user returns to the activity from a stopped state.</p> Signup and view all the answers

    What is a primary feature of Fragments in an Android app?

    <p>They can be reused across multiple Activities</p> Signup and view all the answers

    What should be done in the onDestroy() method of an activity?

    <p>Persist any unsaved data and cleanup resources.</p> Signup and view all the answers

    Which method is called immediately after an activity becomes visible to the user?

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

    What is expected to happen in the onPause() method of an activity?

    <p>The activity may be partially hidden and must save state.</p> Signup and view all the answers

    Which method indicates that the activity is no longer in the foreground?

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

    What is the role of the onCreate() method in an activity?

    <p>It initializes the activity and its user interface.</p> Signup and view all the answers

    How would you best describe an Activity in Android?

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

    What method is used to send data with an Intent in Android?

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

    In the onCreate() method of MainActivity, which line ensures that the ListFragment is displayed?

    <p>getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new ListFragment()).commit();</p> Signup and view all the answers

    What key is used to retrieve the 'username' extra in SecondActivity?

    <p>getIntent().getStringExtra('username');</p> Signup and view all the answers

    How is a button set up to handle a click in the ListFragment?

    <p>detailsButton.setOnClickListener(v -&gt; { ... });</p> Signup and view all the answers

    What is the purpose of the addToBackStack(null) method in the ListFragment?

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

    What is the first step in creating an Intent to view a website?

    <p>intent.setData(Uri.parse('http://...'));</p> Signup and view all the answers

    What does the replace() method achieve when working with fragments?

    <p>Replaces the existing fragment with a new one.</p> Signup and view all the answers

    Which Android component is responsible for handling the lifecycle of an application UI?

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

    Study Notes

    Mobile App Architecture

    • Mobile app architecture structures core app elements (data, presentation, navigation)
    • Good architecture improves performance, maintainability, and scalability
    • Different platforms (Android, iOS) use various architectures (MVVM, Clean, MVC)

    Android Activity Lifecycle

    • Manages user interactions & resource handling
    • Lifecycle stages govern app behavior during different user actions
      • onCreate: Initial setup, UI creation, data binding, component initialization
      • onStart: Makes Activity visible to the user, but not in foreground
      • onResume: Activity gains focus, becomes interactive, animating, updating data
      • onPause: Activity partially blocked, pauses updates, animations, saves data
      • onStop: Activity is no longer visible, user switches to another activity, releases resources
      • onRestart: Activity is resumed after being stopped
      • onDestroy: Final method, cleaned resources, final state persistence

    Components of Android Apps - Activities

    • An Activity is a single screen with a user interface (like a webpage)
      • Examples: news feed, editing a document, navigating a map

    Components of Android Apps - Fragments

    • Reusable UI portion of an Activity
    • Designed to be embedded within an Activity and occupy parts of it, allowing modular designs.
      • Examples: news feed, article content, app settings

    Components of Android Apps - Intents

    • Intents are abstract descriptions of operations
    • Enable Android apps to perform various tasks, such as starting new activities, services, broadcasting messages, and exchanging data between components
      • Types include Explicit Intents (specifying target components) and Implicit Intents (allowing communication between different apps)

    Passing Data with Intent Extras

    • Passing data between activities via Intent Extras
      • Example: Passing user data between activities

    Implementing Activities and Fragments in Android

    • Methods for activity and fragment implementation (including Java code snippets)

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    Related Documents

    Mobile App Architecture PDF

    Description

    Explore the fundamental aspects of mobile app architecture, focusing on core elements like data, presentation, and navigation across platforms such as Android and iOS. Understand the Android activity lifecycle and its stages, which govern app behavior during various user interactions.

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