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Questions and Answers
What operation is performed when the method SaveNewRecord is invoked?
What operation is performed when the method SaveNewRecord is invoked?
What is the purpose of the myData.ViewRecords() method?
What is the purpose of the myData.ViewRecords() method?
Which key term is used to manage database creation and updates in Android?
Which key term is used to manage database creation and updates in Android?
What type of UI element does LinearLayout represent?
What type of UI element does LinearLayout represent?
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What method would you use to update a record in the database based on a given Record ID?
What method would you use to update a record in the database based on a given Record ID?
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What is the primary function of the GridView in this context?
What is the primary function of the GridView in this context?
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What is the purpose of the SQLiteOpenHelper class?
What is the purpose of the SQLiteOpenHelper class?
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What does the deletedRows variable represent after calling the deleteData method?
What does the deletedRows variable represent after calling the deleteData method?
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What feature does AutoCompleteTextView provide in user interfaces?
What feature does AutoCompleteTextView provide in user interfaces?
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Which method is triggered when the database is created for the first time?
Which method is triggered when the database is created for the first time?
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What does the ContentValues class primarily help with?
What does the ContentValues class primarily help with?
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Which SQL command is used to create the student_table?
Which SQL command is used to create the student_table?
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How do you delete a record based on StudentID?
How do you delete a record based on StudentID?
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Which class connects the database to the app’s UI and handles user interactions?
Which class connects the database to the app’s UI and handles user interactions?
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What is required to update a specific record in the database?
What is required to update a specific record in the database?
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What component is used to manage the results of a database query?
What component is used to manage the results of a database query?
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What does the method setMaxDate(long maxDate)
do?
What does the method setMaxDate(long maxDate)
do?
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Which method would you use to retrieve the selected day of the month?
Which method would you use to retrieve the selected day of the month?
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What is the purpose of setOnTimeChangedListener(TimePicker.OnTimeChangedListener listener)
?
What is the purpose of setOnTimeChangedListener(TimePicker.OnTimeChangedListener listener)
?
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Which method allows you to show or hide the date selection spinners?
Which method allows you to show or hide the date selection spinners?
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If you needed to change the displayed date to January 1, 2022, which method would you use?
If you needed to change the displayed date to January 1, 2022, which method would you use?
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What does the attribute android:completionThreshold control?
What does the attribute android:completionThreshold control?
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Which attribute customizes the hint displayed in the dropdown menu?
Which attribute customizes the hint displayed in the dropdown menu?
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What purpose does the AutoCompleteTextView serve in the Java code?
What purpose does the AutoCompleteTextView serve in the Java code?
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Which attribute defines the custom view for the hint in the dropdown?
Which attribute defines the custom view for the hint in the dropdown?
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What is the role of the setAdapter(adapter) method in relation to AutoCompleteTextView?
What is the role of the setAdapter(adapter) method in relation to AutoCompleteTextView?
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Which attribute specifies the view to which the autocomplete dropdown is anchored?
Which attribute specifies the view to which the autocomplete dropdown is anchored?
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How does the android:dropDownHeight attribute affect the appearance of the dropdown menu?
How does the android:dropDownHeight attribute affect the appearance of the dropdown menu?
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Which attribute would you modify to change the width of the dropdown menu?
Which attribute would you modify to change the width of the dropdown menu?
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What does the android:id attribute do in widget definitions?
What does the android:id attribute do in widget definitions?
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Which method retrieves the current text of a ToggleButton?
Which method retrieves the current text of a ToggleButton?
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What is the main purpose of the android:layout_marginTop attribute?
What is the main purpose of the android:layout_marginTop attribute?
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What does the is24HourView() method in a TimePicker return?
What does the is24HourView() method in a TimePicker return?
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Which method would you use to disable a TimePicker widget?
Which method would you use to disable a TimePicker widget?
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How does a ToggleButton update its displayed text?
How does a ToggleButton update its displayed text?
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What functionality does Toast.makeText provide?
What functionality does Toast.makeText provide?
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What does the android:layout_below attribute accomplish?
What does the android:layout_below attribute accomplish?
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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()
andinsert()
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.