Introduction to Android Development
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Introduction to Android Development

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Questions and Answers

What is the purpose of the onResume() method in an Android application lifecycle?

  • It signifies that the activity is no longer visible.
  • It indicates that the user has started interacting with the application. (correct)
  • It is triggered when the activity finishes.
  • It starts the activity after it has been paused.

    • Which method is called before an activity is destroyed?

  • onStop()
  • onRestart()
  • onDestroy() (correct)
  • onPause()

    • What happens when onPause() is called?

  • The activity is no longer visible to the user and cannot execute code. (correct)
  • The activity resumes and becomes visible.
  • The activity can still receive user input.
  • The activity is destroyed, freeing up resources.

    • What event triggers the onRestart() method?

    <p>When the activity is stopped and then restarted.</p> Signup and view all the answers

    Which lifecycle method indicates that an activity is no longer visible?

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

    What is a feature of the Android operating system?

    <p>Provides real-time multitasking capabilities</p> Signup and view all the answers

    Which Android component is responsible for declaring the basic functionalities of an application?

    <p>Android Manifest file</p> Signup and view all the answers

    What is necessary for creating a new activity within an Android application?

    <p>Registering the activity in the Android Manifest file</p> Signup and view all the answers

    In Android UI design, which layout organizes elements in a grid format?

    <p>Table layout</p> Signup and view all the answers

    What is the function of a Broadcast Receiver in an Android application?

    <p>To listen for and respond to broadcast messages from other applications</p> Signup and view all the answers

    Which activity state represents an application that is completely invisible to the user?

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

    When interacting between fragments and activities, what is typically used to communicate data?

    <p>Interface callbacks</p> Signup and view all the answers

    What process is essential for integrating SQLite database operations within an Android application?

    <p>Creating tables, and performing data retrieval and deletion</p> Signup and view all the answers

    What is the default name for the empty activity provided by the template?

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

    Which option must be checked to ensure the app is backwards-compatible with previous Android versions?

    <p>Backwards Compatibility (App Compat)</p> Signup and view all the answers

    Where can you view the layout file in Android Studio?

    <p>activity_main.xml tab</p> Signup and view all the answers

    What does the AndroidManifest.xml file describe?

    <p>The components of the app</p> Signup and view all the answers

    Which menu option do you select to create an Android virtual device?

    <p>Tools &gt; Android &gt; AVD Manager</p> Signup and view all the answers

    What must be declared in the AndroidManifest.xml file for the app to run?

    <p>Each Activity and its components</p> Signup and view all the answers

    What should you do to view the project in the standard Android project hierarchy?

    <p>Select the Android tab from the popup menu</p> Signup and view all the answers

    Which of the following actions is not part of creating a new virtual device?

    <p>Define the screen layout</p> Signup and view all the answers

    What type of compilation does the Android Runtime (ART) use when loading an application onto the device?

    <p>Ahead-of-Time (AOT)</p> Signup and view all the answers

    Which format does the intermediate byte-code of an Android app take when built within Android Studio?

    <p>DEX format</p> Signup and view all the answers

    What is the role of the Dalvik Virtual Machine in the Android environment?

    <p>Serves as a standard Java Virtual Machine for executing Android apps</p> Signup and view all the answers

    What is the relationship between the core libraries and the C/C++ libraries in the Android runtime?

    <p>Core libraries act as Java wrappers around the C/C++ libraries</p> Signup and view all the answers

    What is the primary function of the Application Framework in Android?

    <p>To provide services for running and managing Android applications</p> Signup and view all the answers

    Which of the following best describes the Android Libraries?

    <p>They are a set of Java-based libraries specific to Android development.</p> Signup and view all the answers

    Which key component allows Android applications to utilize multi-threading and memory management?

    <p>Dalvik Virtual Machine (Dalvik VM)</p> Signup and view all the answers

    What is the Executable and Linkable Format (ELF) used for in the Android runtime?

    <p>To provide a native format for executing applications</p> Signup and view all the answers

    What is the primary role of a Fragment in an Android application?

    <p>To represent a portion of the user interface</p> Signup and view all the answers

    Which of the following best describes the purpose of the AndroidManifest.xml file?

    <p>It defines permissions, components, and API usage.</p> Signup and view all the answers

    What are resources in an Android application?

    <p>Static content such as images and layout definitions</p> Signup and view all the answers

    What do Intents do in Android development?

    <p>Send messages to different components of the application</p> Signup and view all the answers

    What is stored in the 'res/' directory of an Android project?

    <p>Various static resources like images and strings</p> Signup and view all the answers

    Why is the AndroidManifest.xml file necessary for all Android applications?

    <p>It declares components and their permissions.</p> Signup and view all the answers

    What role do instrumentation classes play in an Android application?

    <p>They provide profiling and testing information.</p> Signup and view all the answers

    What might be found under the additional components category in an Android application?

    <p>Fragments and views for user interface elements</p> Signup and view all the answers

    Study Notes

    Introduction to Android

    • Android is a mobile operating system based on a modified version of the Linux kernel.
    • Android uses a Java-based framework for application development.
    • Android Studio is the official integrated development environment (IDE) for Android app development.
    • Android applications are built and compiled into an intermediate byte-code format called DEX.
    • Android runtime uses Ahead-of-Time (AOT) compilation to translate DEX code into native instructions for the device processor.

    Android Development Framework

    • Android Runtime (ART) is responsible for executing Android applications.
    • Dalvik Virtual Machine (DVM) is a virtual machine designed and optimized for Android.
    • Android applications run in their own process with their own instance of the Dalvik VM.
    • Android provides a set of core libraries that enable app developers to write applications using Java.

    Android Application Components

    • Android applications are built from reusable components.
    • The AndroidManifest.xml file defines the application's components, permissions, and other metadata.
    • Activities: The building blocks of an application's user interface, each activity representing a single screen.
    • Services: Components that run in the background, performing long-running tasks.
    • Broadcast Receivers: Components that respond to system-wide broadcasts, such as battery level changes.
    • Content Providers: Components that manage and share data with other applications.

    Activity Lifecycle

    • onCreate(): Called when the activity is first created.
    • onStart(): Called when the activity becomes visible.
    • onResume(): Called when the activity is ready to interact with the user.
    • onPause(): Called when the activity is no longer in the foreground.
    • onStop(): Called when the activity is no longer visible.
    • onDestroy(): Called before the activity is destroyed.
    • onRestart(): Called when the activity is restarted after being stopped.

    Building User Interfaces

    • Layouts: Define the structure and arrangement of UI elements.
    • Linear Layout: Arranges elements in a single row or column.
    • Relative Layout: Positions children relative to each other or the parent.
    • Grid Layout: Arranges children in a grid layout.
    • Table Layout: Similar to HTML tables, uses rows and columns.

    Fragments

    • Fragments: Represent self-contained portions of an activity's UI.
    • Fragment Lifecycle: Fragments have their own lifecycle similar to Activities.

    Intents and Broadcasts

    • Intents: Objects that carry information between components.
    • Explicit Intents: Explicitly specify the target component.
    • Implicit Intents: Allow system to find a suitable component.
    • Broadcast Receivers: Components that listen for broadcasts and respond accordingly.

    SQLite Database

    • SQLite: A lightweight database engine embedded in Android.
    • Database Operations: Creating tables, inserting, retrieving, updating, and deleting data.

    Externalizing Resources

    • Resource Files: Contain static content such as images, strings, and layout definitions.
    • res/ Directory: The root directory for storing application resources.
    • Alternative Resources: Provide different resources for different device configurations.

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    Description

    This quiz covers the fundamentals of Android, including its architecture, development framework, and key components. Understand the role of the Android Runtime, Dalvik Virtual Machine, and how applications are structured in Android. Test your knowledge about the essential elements of Android development.

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