Android User Interaction - Chapter 7

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Questions and Answers

Which control type is best suited for entering freeform text?

  • RadioButton
  • CheckBox
  • SeekBar
  • EditText (correct)

Which input control allows the user to select only one option from multiple choices?

  • RadioButton (correct)
  • CheckBox
  • Spinner
  • Toggle

What type of input control is used for a binary on/off choice?

  • Switch (correct)
  • CheckBox
  • EditText
  • SeekBar

Which input control is specifically designed for selecting values within a range?

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

Combining CheckBox elements allows users to do what?

<p>Select multiple options (B)</p> Signup and view all the answers

What is a key feature of EditText controls in Android?

<p>They facilitate text input using a keyboard (C)</p> Signup and view all the answers

When using a Spinner control, what is the user's main functionality?

<p>To choose one option from a dropdown list (D)</p> Signup and view all the answers

In a RadioGroup, what does combining RadioButton elements allow?

<p>Choosing a single option from multiple provided (B)</p> Signup and view all the answers

What is the primary role of the View class in Android development?

<p>To serve as a base for UI components (B)</p> Signup and view all the answers

How can focus be assigned to a View in an Android application?

<p>By user tapping the View or using requestFocus() (D)</p> Signup and view all the answers

Which statement is true about focusable Views?

<p>They can gain focus to accept user input (C)</p> Signup and view all the answers

What determines which View receives user input in a layout?

<p>The focus state of the View (D)</p> Signup and view all the answers

Which of the following correctly distinguishes between clickable and focusable?

<p>Clickable Views respond to taps, while focusable Views accept input (D)</p> Signup and view all the answers

What action does the requestFocus() method perform?

<p>It sets focus to a specific View (D)</p> Signup and view all the answers

What is a consequence of having a View with focus?

<p>It receives input from control devices like keyboards (A)</p> Signup and view all the answers

Which method would be used to manually direct focus to a View?

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

What is the primary order of focus movement after user submits input?

<p>Left to right, top to bottom (A)</p> Signup and view all the answers

How can developers visually indicate which view has focus?

<p>By changing the background color of the focused view (A)</p> Signup and view all the answers

Which attribute in XML is used to specify the next view to receive focus when navigating down?

<p>android:nextFocusDown (A)</p> Signup and view all the answers

Which method would you call to explicitly set focus to a specific view?

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

What is the purpose of the setOnFocusChangeListener() method?

<p>To define what happens when a view gains or loses focus (B)</p> Signup and view all the answers

Which method can be used to find the currently focused view in an activity?

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

What type of keyboard is provided by default when using an EditText?

<p>Alphanumeric keyboard (C)</p> Signup and view all the answers

What happens when the Return (Enter) key is tapped while using an EditText?

<p>It starts a new line (D)</p> Signup and view all the answers

Which XML attribute would you use to define the focusable behavior of a view?

<p>android:focusable (A)</p> Signup and view all the answers

What is a recommended strategy for arranging input controls for focus?

<p>Arrange controls from left to right and top to bottom (A)</p> Signup and view all the answers

Flashcards

EditText

A UI element that allows users to enter text or numbers using the keyboard.

SeekBar

A UI element for selecting a value within a range by dragging a slider.

CheckBox

A UI element that allows users to select one or more options by clicking a checkmark.

RadioButton

A UI element that allows users to select only one option from a group.

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Switch

A UI element that allows users to toggle between two states, like 'on' or 'off'.

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Spinner

A UI element that allows users to choose one item from a list displayed in a dropdown menu.

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View Focus

The state of focus on a UI element.

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Input Controls

Input controls provide ways for users to interact and provide information to an application.

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View

The base class for all UI components, including input controls.

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Clickable View

It can respond to being clicked or tapped.

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Focusable View

It can gain focus to receive input.

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Clickable & Focusable View

A View can respond to being clicked or tapped. It also supports being selected to receive user input.

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Input Control Navigation

The ability to navigate between input controls using keys like the return, tab, or arrow keys.

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requestFocus()

A method to request focus for a View. Can be used for programmatic navigation.

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Top-most view focus

The topmost view in the UI that receives user input when the app starts.

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Focus navigation flow

After a user enters input, the focus automatically moves to the next input element in the UI. Focus moves from left to right and top to bottom within the layout.

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Focus changing based on user actions

The focus can shift even when the user is not directly interacting with individual inputs, often controlled by specific actions like using directional keys.

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Visual focus indication

Visually highlighting the active element lets users know precisely where their input will go.

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Visual focus navigation cues

Providing visual clues to indicate which elements within the UI are interactive helps users navigate and understand the flow of the interaction.

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Predictable focus flow

The order in which inputs receive focus should be predictable and logical, creating a smooth user experience and avoiding confusion.

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Arranging input controls for focus

Organize input controls within your layout from left to right and top to bottom, matching the desired focus order.

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Using view groups for focus

Use view groups in your layout to contain related input controls; this helps you define focus behavior and control the overall layout structure.

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Specifying focus order in XML

You can manually define the focus order of input elements within your XML layout using the android:nextFocusDown attribute, specifying the next element to receive focus.

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Controlling focus with android:focusable attribute

The android:focusable attribute in XML can control whether an input element receives focus on user input.

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Study Notes

Android User Interaction - Chapter 7

  • Android input controls are UI components that allow users to interact with the app
  • The View class is the fundamental building block for all UI components, including input controls
  • View is the base class for interactive UI elements
  • View provides basic interaction through android:onClick
  • View focus is important to facilitate user input and app navigation
  • Only a single View item can maintain focus simultaneously.
  • Focus assignment is managed through user taps, and the application's navigation via return, tabs, or arrow keys
  • requestFocus() is a common way to programmatically set focus.
  • setFocusable() controls if the view can receive focus or not
  • setOnFocusChangeListener() is used to monitor focus changes in a view
  • Activity.getCurrentFocus() finds currently focused view
  • ViewGroup.getFocusedChild() finds focused view within a ViewGroup.
  • EditText is used for freeform text entry using keyboards
  • EditText supports multiple lines and accepts different input types
  • EditText supports alphanumeric keyboard
  • EditText suggestions are displayed as you type
  • Pressing 'Return/Enter' creates a new line in the EditText
  • EditText can be tailored via XML's android:inputType attribute
  • Input types can be specified using textShortMessage, textLongMessage, textPersonName, etc (for customization).
  • SeekBar is used for a ranged input
  • CheckBox allows multiple choices
  • RadioButton allows single choices grouped within RadioGroups
  • ToggleButton or Switch are for on/off states
  • Spinner offers a dropdown list of choices to pick one option
  • android:onClick handler is used to implement actions triggered by clicks or taps on the input controls.
  • User input controls are organized to facilitate a logical and predictable user experience
  • The order of focus follows the visual positioning of (left to right, top to bottom) input controls.

Finding the View with Focus

  • Activity.getCurrentFocus() can retrieve the currently focused View object within an Activity
  • ViewGroup.getFocusedChild() identifies the focused View within a ViewGroup

Additional Input Types

  • android:inputType="textCapCharacters": Capitalizes all input
  • android:inputType="textCapSentences": Capitalizes the first letter of each sentence
  • android:inputType="number": Restricts entry to numbers
  • android:inputType="textEmailAddress": Uses an email keyboard
  • android:inputType="phone": Uses a phone number keyboard
  • android:inputType="textPassword": Hides input, using a password keyboard
  • android:inputType="datetime": Shows a numeric keyboard with slashes and colons for date/time entry.

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