SQLite Application Code Reviewer Guide
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Questions and Answers

What operation is performed when the method SaveNewRecord is invoked?

  • Deletes a record from the database
  • Updates an existing record in the database
  • Retrieves existing records from the database
  • Saves a new record if it does not already exist (correct)

What is the purpose of the myData.ViewRecords() method?

  • To save a new student record to the database
  • To update an existing student record
  • To retrieve all records and display them (correct)
  • To delete a record from the database

Which key term is used to manage database creation and updates in Android?

  • SQLiteOpenHelper (correct)
  • ContentValues
  • GridView
  • Cursor

What type of UI element does LinearLayout represent?

<p>A container that arranges child views in sequence (D)</p> Signup and view all the answers

What method would you use to update a record in the database based on a given Record ID?

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

What is the primary function of the GridView in this context?

<p>To display database records in a structured format (A)</p> Signup and view all the answers

What is the purpose of the SQLiteOpenHelper class?

<p>To simplify database creation and version management (C)</p> Signup and view all the answers

What does the deletedRows variable represent after calling the deleteData method?

<p>The number of records successfully deleted from the database (A)</p> Signup and view all the answers

What feature does AutoCompleteTextView provide in user interfaces?

<p>Allow users to make selections from a list as they type (D)</p> Signup and view all the answers

Which method is triggered when the database is created for the first time?

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

What does the ContentValues class primarily help with?

<p>Storing key-value pairs for database operations (A)</p> Signup and view all the answers

Which SQL command is used to create the student_table?

<p>CREATE TABLE student_table (A)</p> Signup and view all the answers

How do you delete a record based on StudentID?

<p>db.delete(TABLE_NAME, &quot;StudentID = ?&quot;, new String[] { id }) (C)</p> Signup and view all the answers

Which class connects the database to the app’s UI and handles user interactions?

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

What is required to update a specific record in the database?

<p>The record's StudentID and new values in ContentValues (D)</p> Signup and view all the answers

What component is used to manage the results of a database query?

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

What does the method setMaxDate(long maxDate) do?

<p>Sets the maximum date supported. (C)</p> Signup and view all the answers

Which method would you use to retrieve the selected day of the month?

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

What is the purpose of setOnTimeChangedListener(TimePicker.OnTimeChangedListener listener)?

<p>To detect changes in the time selection. (B)</p> Signup and view all the answers

Which method allows you to show or hide the date selection spinners?

<p>setSpinnersShown(boolean shown) (A)</p> Signup and view all the answers

If you needed to change the displayed date to January 1, 2022, which method would you use?

<p>updateDate(int year, int month, int dayOfMonth) (A)</p> Signup and view all the answers

What does the attribute android:completionThreshold control?

<p>The number of characters required before suggestions appear. (C)</p> Signup and view all the answers

Which attribute customizes the hint displayed in the dropdown menu?

<p>android:completionHint (C)</p> Signup and view all the answers

What purpose does the AutoCompleteTextView serve in the Java code?

<p>To display a suggestion dropdown while typing. (B)</p> Signup and view all the answers

Which attribute defines the custom view for the hint in the dropdown?

<p>android:completionHintView (C)</p> Signup and view all the answers

What is the role of the setAdapter(adapter) method in relation to AutoCompleteTextView?

<p>To bind the ArrayAdapter to the AutoCompleteTextView. (C)</p> Signup and view all the answers

Which attribute specifies the view to which the autocomplete dropdown is anchored?

<p>android:dropDownAnchor (C)</p> Signup and view all the answers

How does the android:dropDownHeight attribute affect the appearance of the dropdown menu?

<p>It determines the vertical space taken by the dropdown menu. (D)</p> Signup and view all the answers

Which attribute would you modify to change the width of the dropdown menu?

<p>android:dropDownWidth (B)</p> Signup and view all the answers

What does the android:id attribute do in widget definitions?

<p>Sets a unique identifier for the widget (B)</p> Signup and view all the answers

Which method retrieves the current text of a ToggleButton?

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

What is the main purpose of the android:layout_marginTop attribute?

<p>To add spacing above the widget for better UI alignment (C)</p> Signup and view all the answers

What does the is24HourView() method in a TimePicker return?

<p>Returns true if the TimePicker is in 24-hour view mode (D)</p> Signup and view all the answers

Which method would you use to disable a TimePicker widget?

<p>setEnabled(boolean enabled) (C)</p> Signup and view all the answers

How does a ToggleButton update its displayed text?

<p>Based on its current state (ON or OFF) (B)</p> Signup and view all the answers

What functionality does Toast.makeText provide?

<p>Displays a short message to the user (D)</p> Signup and view all the answers

What does the android:layout_below attribute accomplish?

<p>Positions the widget below another widget using its ID (D)</p> Signup and view all the answers

Flashcards

SQLiteOpenHelper

A base class for managing SQLite databases, simplifying database creation and version management.

ContentValues

Helps store key-value pairs for database operations (like insert and update).

Cursor

Manages the results of database queries.

SQLiteDatabase

Provides methods for CRUD (Create, Read, Update, Delete) database operations.

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onCreate (in SQLiteOpenHelper)

Called when the database is first created.

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onUpgrade (in SQLiteOpenHelper)

Handles schema changes between database versions.

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Database table definition

Defines the columns and data types of a table in a database using SQL.

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Inserting data

Adding new data to a database table using a method like insert().

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AutoCompleteTextView

A type of EditText in Android that displays suggestions as you type, enhancing user input.

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ArrayAdapter

A class that connects an array of data to the AutoCompleteTextView, supplying the suggestions.

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setThreshold(int n)

A method that determines the minimum number of characters a user must type before suggestions appear.

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setAdapter(adapter)

Attaches the ArrayAdapter to the AutoCompleteTextView, allowing suggestions to be shown.

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android:completionHint

Specifies the hint displayed in the drop-down menu when no suggestions are available.

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android:completionThreshold

Sets the minimum number of characters needed to trigger suggestions.

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android:dropDownWidth

Determines the width of the drop-down suggestion list.

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android:popupBackground

Defines the background color or style of the drop-down suggestion list.

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android:layout_height

Sets the vertical size of a widget in your Android layout. It determines how much space the widget occupies on the screen.

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android:id

Assigns a unique identifier to a widget, making it possible to access and manipulate it in your Java code.

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android:ems

Controls the width of an AutoCompleteTextView by specifying the number of text characters it can display.

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android:layout_below

Places a widget directly below another widget in your layout based on its ID.

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android:layout_marginTop

Adds extra space above a widget, creating visual separation between it and the widget above it.

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ToggleButton

A button with two states: ON and OFF. Users can toggle between these states.

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setOnClickListener

This method registers a listener that tells your app what to do when a Button is clicked.

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getText()

Used to get the current text displayed by a ToggleButton. It shows whether it's ON or OFF.

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Add Record Function

This function saves a new record into the database if it doesn't already exist. It takes input fields like Student ID, First Name, and Last Name to create the record.

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View Records Function

This function retrieves all records from the database and displays them in a GridView. It uses a Cursor to iterate through the database results and populates a list with each record.

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Edit Record Function

This function modifies an existing record in the database. It takes the record ID and new values for fields like Student ID, First Name, and Last Name.

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Delete Record Function

This function removes a record from the database. It takes the Student ID as input and deletes the corresponding record.

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LinearLayout

LinearLayout arranges child views in a single row or column. It's used for layout design, placing UI elements like buttons and text fields in a specific order.

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EditText

EditText is a text input field for users to type information. It's a versatile component used to gather user data like names, passwords, or addresses.

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Button

A button triggers specific actions when clicked. It's an essential UI element for user interaction, enabling actions like submitting forms, navigating between screens, or initiating tasks.

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GridView

A GridView presents information in a tabular format, displaying data in rows and columns. It's commonly used to showcase lists of items, database records, or images in a visually organized manner.

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setOnTimeChangedListener()

A method in TimePicker that sets a callback listener to detect changes in the selected time. The listener is notified whenever the user changes the hour or minute.

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getDayOfMonth()

A method in DatePicker that returns the selected day of the month as an integer.

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getMonth()

A method in DatePicker that returns the currently selected month as an integer (0 for January, 11 for December).

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setMaxDate(long maxDate)

A method in DatePicker that sets the maximum date supported by the DatePicker, expressed in milliseconds since January 1, 1970.

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Study Notes

SQLite Application Code Reviewer Guide

  • This guide explains the code sections, key terms, and roles in building Android apps with SQLite.

Key Components Overview

  • SQLiteOpenHelper: Simplifies database creation and version management.
  • ContentValues: Stores key-value pairs for database operations (insert, update).
  • Cursor: Manages database query results.
  • SQLiteDatabase: Provides methods for database CRUD (Create, Read, Update, Delete) operations.

Code Walkthrough and Explanation

  • DatabaseHelper Class: Manages the database, tables, and CRUD operations.
  • SQLiteOpenHelper: Base class for managing SQLite databases.
  • onCreate: Triggered when the database is first created.
  • onUpgrade: Handles schema changes between database versions.
  • Database Properties:
    • DATABASE_NAME = "Student.db"
    • TABLE_NAME = "student_table"
  • Table Schema Definition:
    • CREATE TABLE student_table (ID INTEGER PRIMARY KEY AUTOINCREMENT, StudentID TEXT, FirstName TEXT, LastName TEXT)

Database Operations

  • Insert Data: Uses contentValues.put() and insert() to add data.
  • Read Data: Uses rawQuery() to retrieve all records.
  • Update Data: Updates a specific record based on StudentID.
  • Delete Data: Deletes a record where StudentID matches the given value.

MainActivity Class

  • Connects the database to the app's UI and handles user interactions.

Key Terms

  • EditText: Input field for user data.
  • GridView: Displays database records in a tabular format.
  • onClick: Event handler triggered by button clicks

Initialize UI Components

  • Maps XML-defined UI elements to Java objects for manipulation.

Add Record

  • Saves a new record to the database if it doesn't already exist.

View Records

  • Retrieves all records and displays them in a GridView.

Edit Record

  • Updates a record with the given textRecordID.

Delete Record

  • Deletes a record based on StudentID.

XML File

  • Defines the visual structure of the app.
  • LinearLayout: Arranges child views vertically or horizontally.
  • EditText: Input fields for user data.
  • Button: Triggers specific actions in the app.
  • GridView: Displays database records in a tabular format

Importance of This Code

  • Scalable Database Management: Handles data efficiently using SQLite, ideal for small apps.
  • User Interaction: Provides CRUD functionality directly from the UI.
  • Learning Opportunity: Demonstrates practical use of SQLite and Android development concepts.

Summary of Key Terms (Page 6)

  • SQLiteOpenHelper: Base class for database creation and updates.
  • onCreate: Called when database is first created.
  • ContentValues: Holds key-value pairs for database operations.
  • Cursor: Retrieves data from database queries.
  • SQLiteDatabase: Provides methods for interacting with the database.
  • LinearLayout: Arranges child views.
  • EditText: User data input field.
  • GridView: Displays data in a table format.
  • AlertDialog: Displays pop-up messages.

Module 5: AutoCompleteTextView

  • Extends the EditText widget for displaying suggestions.
  • Improves user experience in search bars, form inputs, and other text fields.

Attributes and Descriptions (Page 6)

  • android:completionHint: Specifies the hint displayed in the dropdown.
  • android:completionHintView: Defines a custom view for dropdown hints.
  • android:completionThreshold: Minimum characters before suggestions appear.
  • android:dropDownAnchor: Specifies the anchoring view for dropdown.
  • android:dropDownHeight: Sets the height of the dropdown menu.
  • android:dropDownHorizontalOffset: Horizontal offset of the dropdown.

Key Java Components

  • AutoCompleteTextView: Specialized EditText for suggestions.
  • ArrayAdapter: Bridges data array with dropdown suggestions.
  • setThreshold: Sets minimum characters for suggestions.
  • setAdapter: Links ArrayAdapter to AutoCompleteTextView.
  • R.layout.select_dialog_item: Layout for each dropdown item.

Key XML Attributes

  • android:layout_width: Sets widget width.
  • android:layout_height: Sets widget height.
  • android:id: Unique widget identifier.
  • android:ems: Sets width in characters.
  • android:layout_below: Positions widget below another.
  • android:layout_marginTop: Adds spacing above a widget.

ToggleButton (Page 8)

  • A button with ON/OFF states.
  • setOnClickListener: Executes code when pressed.
  • getText(): Retrieves button's current state (e.g., ON or OFF).
  • StringBuffer: Dynamically appends text for messages.
  • Toast.makeText: Displays short messages (Toasties) to the user.

TimePicker (Page 8)

  • Methods for managing time selection in an Android app.

    • is24HourView(): Checks for 24-hour format.
    • isEnabled(): Checks if the TimePicker button is enabled.
    • setCurrentHour(): Sets the current hour.
    • setCurrentMinute(): Sets the current minute.
    • setEnabled(): Enables or disables the TimePicker.
    • setIs24HourView(): Sets the time picker mode to 24 or AM/PM.

DatePicker (Page 9)

  • Methods for selecting dates.

    • getDayOfMonth(): Gets the selected day.
    • getMonth(): Gets the selected month.
    • getYear(): Gets the selected year.
    • setMaxDate(): Sets the maximum selectable date.
    • setMinDate(): Sets the minimum selectable date.
    • setSpinnersShown(): Shows or hides the spinners.
    • updateDate(): Updates the displayed date.
    • getCalendarView(): Returns the CalendarView.
    • getFirstDayOfWeek(): Gets the first day of the week.

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Description

This guide provides insights into the essential components of building Android apps using SQLite. It covers key elements like SQLiteOpenHelper, ContentValues, and Cursor, essential for managing database operations. Additionally, it includes an overview of the DatabaseHelper class and its role in CRUD operations.

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