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Questions and Answers
What is the primary purpose of user input controls in Android applications?
What is the primary purpose of user input controls in Android applications?
- To allow users to interact and provide input (correct)
- To display graphics and images
- To manage database connections
- To structure the application's layout
Which of the following controls is NOT primarily used for constrained user input choices?
Which of the following controls is NOT primarily used for constrained user input choices?
- TextView (correct)
- Spinners
- Radio buttons
- CheckBoxes
What does 'focus' refer to in the context of user input controls?
What does 'focus' refer to in the context of user input controls?
- The visual emphasis on a control element
- The assignment of input to a specific control (correct)
- The responsiveness of an app to user interaction
- The ability of a control to be clicked
How can a view gain focus in an Android application?
How can a view gain focus in an Android application?
Which of these elements is considered a basic user input control in Android?
Which of these elements is considered a basic user input control in Android?
What is the role of the View class in Android user input controls?
What is the role of the View class in Android user input controls?
Which type of user input control allows users to make a choice by selecting from a dropdown menu?
Which type of user input control allows users to make a choice by selecting from a dropdown menu?
What action could define a view as 'clickable' in an Android application?
What action could define a view as 'clickable' in an Android application?
What is the correct order for focus traversal after user input is submitted?
What is the correct order for focus traversal after user input is submitted?
Which method allows you to explicitly set focus on a specific view?
Which method allows you to explicitly set focus on a specific view?
How must input controls be arranged for predictable focus navigation?
How must input controls be arranged for predictable focus navigation?
What is the primary function of a CheckBox in a user interface?
What is the primary function of a CheckBox in a user interface?
Which statement is true about RadioButtons?
Which statement is true about RadioButtons?
What distinguishes an ImageButton from a standard Button?
What distinguishes an ImageButton from a standard Button?
Which of the following describes the functionality of a ToggleButton?
Which of the following describes the functionality of a ToggleButton?
What is a key characteristic of the EditText class?
What is a key characteristic of the EditText class?
What is the primary function of an adapter in Android?
What is the primary function of an adapter in Android?
Which type of dialog is designed to require user action before returning to the activity?
Which type of dialog is designed to require user action before returning to the activity?
Which of the following accurately describes a DatePickerDialog?
Which of the following accurately describes a DatePickerDialog?
What is the role of the positive button in an AlertDialog?
What is the role of the positive button in an AlertDialog?
What is the purpose of the Spinner class in Android?
What is the purpose of the Spinner class in Android?
In which scenarios would you typically use a TimePickerDialog?
In which scenarios would you typically use a TimePickerDialog?
Which of the following is NOT typically part of an AlertDialog?
Which of the following is NOT typically part of an AlertDialog?
What is a common characteristic of a Spinner in Android?
What is a common characteristic of a Spinner in Android?
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Study Notes
User Input Controls in Android
- Android applications use various user input controls like TextView, CheckBox, EditText, and buttons for user interaction.
- Users interact through clicking, pressing, typing, speaking, and gestures.
- Input controls include buttons, menus, keyboards, text fields, and microphones.
Designing User Interactions
- Applications must be obvious, easy to navigate, and consistent to enhance user experience.
- Minimizing steps and ensuring accessibility in UI elements is crucial.
- Following Android best practices helps meet user expectations.
Types of User Input
- Free form input: Accepts text and voice.
- Constrained input: Involves selections through controls like pickers, checkboxes, and radio buttons.
- Various actions include using buttons, checkboxes, spinners, and contextual menus.
View Class
- The View class is the standalone building block for all UI elements in Android.
- It supports interactive components and facilitates actions through attributes like android:onClick.
Focus Management
- Focus indicates which view receives input; only one view can have focus at a time.
- Focus can be assigned by user action, application prompts, or programmatically using requestFocus().
Clickable vs. Focusable
- Clickable: A view can respond to taps or clicks.
- Focusable: A view can gain focus to accept input. Keyboards send input to the focused view.
User Navigation
- Follow a predictable focus flow from left to right and top to bottom.
- Use visual cues to indicate active focus and available focusable views.
Managing Focus Programmatically
- Methods include setFocusable(), requestFocus(), and setOnFocusChangeListener() to control focus behavior and interactions.
EditText Control
- EditText allows multi-line input for characters, numbers, and symbols with features such as spelling correction and customizable action keys.
Button Types
- Button: Responds to clicks with visual representation of action.
- ImageButton: Displays an image instead of text, suitable for visually conveying actions.
CheckBox and RadioButton Functions
- CheckBox: Users can select multiple choices; each checkbox functions independently.
- RadioButton: Users can choose only one option within a RadioGroup; selecting one unchecks others.
ToggleButton and Switch
- Allow toggling between two states (on/off), useful for settings adjustments.
Spinner Control
- Presents a drop-down list for a single selection from multiple values; requires an Adapter for data binding.
Understanding Adapters
- An adapter serves as a bridge between different components, facilitating data transfer between a data source and UI.
Dialogs in Android
- Dialogs interrupt the flow for user action; examples include AlertDialog, DatePickerDialog, and TimePickerDialog.
- Dialogs require user interaction to dismiss and can present options or confirm actions.
AlertDialog Characteristics
- Displays a title, content area, and up to three action buttons (positive, negative, neutral) to manage user responses.
DatePickerDialog and TimePickerDialog
- DatePickerDialog: Provides a calendar interface for date selection.
- TimePickerDialog: Allows users to select time either in 12-hour or 24-hour format for time-dependent applications.
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