Android App Development - Front-end
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Questions and Answers

What is the purpose of the 'ems' unit of measurement in Android?

  • To set the height of a TextView/EditText to fit a specific text size
  • To set the width of a TextView/EditText to fit a text of n 'M' letters (correct)
  • To set the background color of a TextView/EditText
  • To set the width of a TextView/EditText to fit a specific text size

    • What is the purpose of the 'android:inputType' attribute in Android?

  • To set the width of an EditText
  • To set the height of an EditText
  • To set the background color of an EditText
  • To set the type of input allowed in the field (correct)

    • What is the purpose of the 'android:padding' attribute in Android?

  • To set the spaces between the content and the border of a widget element (correct)
  • To set the width of a widget element
  • To set the background color of a widget element
  • To set the spaces outside of a view

    • What is the purpose of the 'android:margin' attribute in Android?

    <p>To set the spaces outside of a view</p> Signup and view all the answers

    What is the purpose of the 'android:border' attribute in Android?

    <p>To add a line that goes around an object</p> Signup and view all the answers

    Where can you save a string value in Android to use it later in the app?

    <p>In the strings.xml file in the values sub-folder in the res folder</p> Signup and view all the answers

    What is the purpose of the 'android:ems' attribute in an EditText?

    <p>To set the width of the EditText to fit a text of n 'M' letters</p> Signup and view all the answers

    What is the default unit of measurement for the 'android:padding' and 'android:margin' attributes in Android?

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

    What is the purpose of the 'android:contentDescription' attribute in an ImageView?

    <p>To add a description to the ImageView for accessibility purposes</p> Signup and view all the answers

    What is the purpose of the strings.xml file in Android?

    <p>To store string values that can be used throughout the app</p> Signup and view all the answers

    Study Notes

    XML in Android App Development

    • XML (eXtensible Markup Language) is used for storing and transferring data, similar to HTML
    • XML is case-sensitive, requires each tag to be closed properly, and preserves whitespace
    • XML tags need not be predefined like HTML

    XML Layout File

    • Each XML file used to design the Android UI is known as a Layout file
    • Every tag has its Attributes
    • Root View is a root element of an XML Layout file, and all tags corresponding to various components of the UI must be placed between the starting and ending tag of the main root tag
    • Each Layout file contains only one root tag

    Common Layouts

    • Relative Layout: displays its child content in positions relative to the parent
    • Linear Layout: aligns its contents into a single direction, vertical or horizontal
    • Frame Layout: a placeholder on a screen that displays only a single view, i.e., a Fragment

    Views

    • All Views are placed in a Layout
    • Text, Images, and buttons are all views
    • View Group is an invisible container that holds multiple views together and defines their layout properties

    Common View Groups

    • List View: displays a list of scrollable items
    • Grid View: displays items in a 2D scrollable grid
    • Table Layout: groups views into rows and columns

    Attributes in a Tag

    • Android:id: gives a component or tag an id for future reference
    • Android:layout_width and Android:layout_height: specify the width and height of a 2D design component
    • Android:text: specifies the text to be shown in a View

    XML Tags for Android

    • TextView: displays a formatted text label
    • ImageView: displays an image resource
    • Button: can be clicked to perform an action
    • ImageButton: displays a clickable image
    • EditText: an editable text field for user input
    • ListView: a scrollable list of items containing other views

    RelativeLayout

    • Enables specifying how child views are positioned relative to each other
    • Position properties in child elements:
      • Android:layout_alignParentRight= “true”
      • Android:layout_alignParentLeft= “true”
      • Android:layout_alignParentBottom= “true”
      • Android:layout_alignParentTop= “true”
    • More positions for child elements:
      • Android:layout_centerInParent= “true”
      • Android:layout_centerVertical= “true”
      • Android:layout_centerHorizontal= “true”

    Giving IDs to Tags

    • Android:id= “@+id/btnStartApp”
    • Use clear and understandable naming conventions for IDs

    More Positions for Child Elements using IDs

    • Android:layout_toRightOf= “@+id/btnStartApp”
    • Android:layout_toLeftOf= “@+id/btnStartApp”
    • Android:layout_above= “@+id/btnStartApp”
    • Android:layout_below= “@+id/btnStartApp”

    LinearLayout

    • Aligns all children in either vertically or horizontally
    • Properties:
      • Android:orientation = “vertical”
      • Android:gravity = “center”

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    Description

    This quiz covers the front-end aspects of Android app development, including XML, Android layouts, and UI components.

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