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

    What is the purpose of the SQLiteOpenHelper class?

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

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

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

    What does the ContentValues class primarily help with?

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

    Which SQL command is used to create the student_table?

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

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

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

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

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

    What does the method setMaxDate(long maxDate) do?

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

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

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

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

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

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

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

    What does the attribute android:completionThreshold control?

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

    Which attribute customizes the hint displayed in the dropdown menu?

    <p>android:completionHint</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.</p> Signup and view all the answers

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

    <p>android:completionHintView</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.</p> Signup and view all the answers

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

    <p>android:dropDownAnchor</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.</p> Signup and view all the answers

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

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

    Which method retrieves the current text of a ToggleButton?

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

    Which method would you use to disable a TimePicker widget?

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

    How does a ToggleButton update its displayed text?

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

    What functionality does Toast.makeText provide?

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

    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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    Related Documents

    ITWB312 Reviewer Finals PDF

    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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