Android Common Controls Quiz
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What type of objects are used to build all user interface elements in an Android app?

  • Activity and Intent objects
  • Model and Controller objects
  • Service and Broadcast objects
  • View and ViewGroup objects (correct)

    • Which type of object in Android is responsible for defining the position of views in the interface?

  • Intent
  • View
  • Activity
  • ViewGroup (correct)

    • What are ViewGroups also commonly referred to as in Android?

  • Output groups
  • Container views (correct)
  • Input groups
  • Control views

    • Which type of object in Android draws something on the screen that the user can interact with?

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

    What type of object is a layout in Android?

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

    What is the purpose of an event listener in Android?

    <p>To capture user interaction with the UI</p> Signup and view all the answers

    Which class in Android contains a range of event listener interfaces?

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

    What is the role of a callback method in Android event handling?

    <p>To respond to a specific type of event</p> Signup and view all the answers

    How are events handled in Android applications?

    <p>Handled sequentially as they occur</p> Signup and view all the answers

    Why must a view have an event listener and callback method in Android?

    <p>To allow the view to respond to user interactions</p> Signup and view all the answers

    How can a layout be declared in Android?

    <p>Both using XML Layout and instantiating elements at runtime</p> Signup and view all the answers

    Which of the following is NOT a pre-built UI component in Android?

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

    What is the purpose of using Android's XML vocabulary for UI design?

    <p>To allow quick design of UI layouts with nested elements</p> Signup and view all the answers

    Which of the following is NOT a type of layout model provided by Android?

    <p>Grid Layout</p> Signup and view all the answers

    In Android, how can an application interact with View and ViewGroup objects?

    <p>By manipulating properties programmatically</p> Signup and view all the answers

    What is the purpose of using ConstraintLayout in Android app development?

    <p>To create complex layouts quickly and easily without nesting other layout types</p> Signup and view all the answers

    What is the role of an Adapter in Android's AdapterView class?

    <p>Retrieve data and convert it into a view</p> Signup and view all the answers

    How are input controls added to the user interface in an Android app?

    <p>By drag-and-drop on the design window or adding XML elements to the layout file</p> Signup and view all the answers

    Which component acts as a bridge between the data source and the AdapterView layout in Android?

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

    What is a key advantage of using a layout that subclasses AdapterView with dynamic content in Android apps?

    <p>Efficient population of views at runtime</p> Signup and view all the answers

    What type of control is a Button in Android?

    <p>Push-button that performs an action</p> Signup and view all the answers

    Which control is used for cases where only one option can be selected in a group?

    <p>Radio button</p> Signup and view all the answers

    What is the purpose of a Spinner in Android?

    <p>Selecting one value from a set</p> Signup and view all the answers

    What is the basic approach to creating custom components in Android?

    <p>Extend an existing View class and override superclass methods</p> Signup and view all the answers

    Which control allows the user to toggle between two states?

    <p>Toggle button</p> Signup and view all the answers

    What method is used to load the XML layout resource in an Android Activity?

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

    In Android, what should be included in the Activity.onCreate() method to set the layout resource for an Activity?

    <p>setContentView(R.layout.activity_main)</p> Signup and view all the answers

    What does Android Studio allow developers to create to optimize UI design for specific screen sizes?

    <p>Alternative layout resources</p> Signup and view all the answers

    In Android, what kind of hierarchy is used to define the layout structure?

    <p>View hierarchy</p> Signup and view all the answers

    Which method should be called to create a suggested qualifier for optimizing UI design in Android Studio?

    <p>Create Resource Qualifier</p> Signup and view all the answers

    What method is called on a View object when it is touched in Android?

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

    In Android, what is the purpose of android:onClick resource for a Button view?

    <p>To call a callback method for capturing click events on the button view</p> Signup and view all the answers

    What is the purpose of an event listener in Android?

    <p>To detect and handle user interactions with UI elements</p> Signup and view all the answers

    Which event listener in Android is used to detect click style events?

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

    What callback method does the onLongClickListener correspond to in Android?

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

    Which method is used to handle touch events on a View object in Android?

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

    What is the purpose of the onClick() callback method in Android?

    <p>To handle click style events on UI elements</p> Signup and view all the answers

    What type of interface element can the onClickListener be associated with in Android?

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

    In Android, what is the primary function of an event handler?

    <p>To execute tasks based on user interactions</p> Signup and view all the answers

    Study Notes

    Building Android UI Elements

    • View: The foundational object for all user interface elements in an Android app.
    • ViewGroup: A container that holds and arranges other views. Also known as Layout.
    • Layout: Defines the arrangement and organization of views in an Android interface. It's a specialization of a ViewGroup object, responsible for visual positioning.

    Positioning Views

    • ConstraintLayout: A flexible layout mechanism in Android, allowing you to define the position and size of views based on constraints.

    Event Handling

    • Event Listener: An interface that listens for user interactions with views in the Android UI.
    • View.OnClickListener: A standard interface for handling click events.
    • View.onLongClickListener: An interface dedicated to handling long press events.
    • Callback Methods: Functions triggered when an event occurs within an Android view.
    • Event Handling Process: An event listener monitors for specific user interactions with a view. Upon interaction, the corresponding callback method is invoked.
    • Event Handling Requirement: A view must have an event listener attached and a callback method implemented to respond to events.

    UI Components

    • Input Controls: UI elements that allow users to input information, such as text boxes, checkboxes, and buttons.
    • Button: A control that triggers a specific action when clicked.
    • RadioGroup: Used to create a group in which only one option can be selected.
    • Spinner: A control that provides a dropdown menu with various options.
    • Adapter: Connects the data source to the specific layout.
    • AdapterView (Layout with Dynamic Content): Enables the inclusion of dynamic data within the layout.
    • Custom Components: Created to meet specific UI requirements.
    • Switch: Allows users to toggle between two states, often "on" and "off."

    Layout Management

    • XML Vocabulary (UI Design): Android's XML language for defining UI layouts, enhancing readability and organization.
    • Pre-built UI Components: Standard UI controls offered by Android, such as buttons, text views, list views, etc.
    • Layout Types (predefined): Linear, Constraint, Relative, Frame, and Grid layouts.
    • UI Interaction: Android applications interact with View and ViewGroup objects by handling events and modifying view properties.

    Android Studio UI Design

    • Layout Optimization: Developers can create different device qualifiers to adapt their layouts.
    • Layout Hierarchy: Android uses a hierarchical structure for defining UI layouts.
    • Optimizing UI Design: The createSuggestedQualifier() method can assist in generating optimized UI design configurations.

    Event Handling

    • View.onTouchEvent(): The method called when a View object receives a touch event.
    • android:onClick (Resource): A reference to a method associated with a Button click event.
    • Click Events: Click events are handled by the View.OnClickListener interface and its onClick() callback method.
    • Long Press Events: Handled through View.onLongClickListener and its onLongClick() callback method.
    • Touch Events: Managed using View.onTouchEvent() and its associated methods.
    • onClick() (Callback): A method triggered when a View is clicked.
    • Event Handler: The primary role of an event handler is to capture user interactions and respond accordingly.

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    Related Documents

    lecture 2 - Mobile apps design.pdf

    Description

    Test your knowledge on common user interface controls in Android such as buttons, text fields, checkboxes, and radio buttons. Understand the functionality and usage of each control type in Android app development.

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