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

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

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

What does Mobile App Architecture refer to?

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

How does Mobile App Architecture impact an app?

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

Which architecture pattern is commonly used in Android development?

<p>MVVM or Clean Architecture. (B)</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. (D)</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. (A)</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. (D)</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. (C)</p> Signup and view all the answers

What does the Android Activity Lifecycle manage?

<p>User interactions and resource handling. (D)</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. (C)</p> Signup and view all the answers

When is the onRestart() method invoked?

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

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

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

In which method would you typically handle background tasks?

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

What occurs during the onPause() method?

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

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

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

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

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

How is data passed to another activity in Android?

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

What happens if savedInstanceState is null during the onCreate method?

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

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

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

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

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

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

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

What class does ListFragment extend in the given example?

<p>Fragment (C)</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 (B)</p> Signup and view all the answers

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

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

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

<p>List of news articles (C)</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 (B)</p> Signup and view all the answers

In what situation would an Activity call onDestroy()?

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

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Flashcards

What is Mobile App Architecture?

The structure of an app's core elements including data, presentation, and navigation.

Why is Mobile App Architecture important?

It affects app performance, maintainability, and scalability.

What is the Android Activity Lifecycle?

A mechanism in Android apps to manage interactions with the user and resources.

What are the Lifecycle Stages?

The different stages an Activity goes through during its lifecycle.

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What does the onCreate() method do?

It's called when an Activity is first created. You use it to initialize the Activity, set up the UI, bind data, and initialize components.

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What does the onStart() method do?

It's called after onCreate and made the Activity visible to the user but not yet in the front. Used for re-initiating things when the Activity becomes visible, like registering receivers or starting animations.

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What does the onResume() method do?

It's called when the Activity gains focus and becomes interactive. Start updates that need to happen when the Activity is active, like starting animations, refreshing UI or updating data.

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What does the onPause() method do?

It's called when the Activity is partially blocked such as when a dialog appears or the user navigates away. You should pause updates, animations, or audio playback, save data, and commit changes.

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onStop()

Called when the Activity is no longer visible, often when the user opens a new Activity.

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onRestart()

Called if an Activity is stopped and then restarted, such as when a user returns to the Activity from the Recent Apps menu.  Use this to re-initialize any resources released in onStop.

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onDestroy()

Final method called before the Activity is destroyed, either due to user or system-initiated actions.  Clean up any remaining resources, end background tasks, and perform any final state persistence if it has not already been handled.

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onCreate()

Called when the Activity is created for the first time. It’s where you set up the Activity’s content, usually by calling setContentView(R.layout.activity_main)

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onStart()

Called when the Activity becomes visible to the user. This is where you can start animations, load data, or perform other tasks that need to happen when the Activity is visible.

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onResume()

Called when the Activity is in the foreground and ready to interact with the user. This is where you can perform tasks that need to happen when the Activity is in the foreground.

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onPause()

Called when the Activity is no longer running. This is where you can save any changes the user has made or release any resources that are no longer needed.

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What is an Android Activity?

This Activity serves as a single screen in an Android app, similar to a web page on a website.

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Fragment

A reusable piece of UI code that can be included in multiple places within an app.

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Intent

A mechanism for launching an activity or service within the same or another application.

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Explicit Intent

An intent that specifies the exact component to be launched, typically within the same application.

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Implicit Intent

An intent that does not specify a specific component, allowing for communication between different apps.

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What is an Activity in Android?

A single screen within an Android app with a user interface, similar to a web page.

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What is the purpose of Activities?

Activities allow users to interact with specific parts of an app, such as viewing a list of news articles or configuring settings.

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What is Activity Lifecycle?

The lifecycle of an Activity describes the different states it can be in, from creation to destruction.

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What is the purpose of onCreate() in Activity Lifecycle?

This method is called when the Activity is first created. It's where you typically initialize the layout and components.

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What is the purpose of onResume() in Activity Lifecycle?

This method is called when the Activity becomes fully visible to the user and can be interacted with.

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What is a Fragment in Android?

A reusable part of an app's user interface, often embedded within an Activity to create modular UI designs.

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What is the benefit of using Fragments?

Fragments allow you to create flexible and reusable UI elements that can be used across different screens or sections within your app.

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Why are Fragments useful?

Fragments are a great way to create smaller, more focused UI components that provide a better user experience.

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Intent Extras

A way to pass data between different activities (screens) in your app, using key-value pairs.

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Android Activity

A fundamental building block in Android apps. Each Activity represents a single screen or UI component.

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Android Fragment

A UI element that makes your app more modular and re-usable. Imagine them as self-contained pieces of your user interface.

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Android Activity Lifecycle

A method called when the user interacts with your Activity. It's a lifecycle event for Activity management.

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onCreate() Method (Activity)

The first method called when your Activity is launched or recreated. It's where you set up the UI, bind data, and initialize your Activity.

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onCreateView() Method (Fragment)

A method called when the user interacts with your Activity to display data or create visual elements. It's where you interact with the user interface.

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Fragment Manager

A container that holds and manages Fragments within an Activity. They provide a way to switch between different Fragments.

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Fragment Back Stack

A way to navigate back and forth through Fragments, preserving past views or settings.

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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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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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