Android Developer Fundamentals V2 - Menus

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Questions and Answers

What is the primary purpose of the App Bar in an Android application?

  • To manage background tasks.
  • To display the content of the current Activity.
  • To serve as a consistent top interface across screens. (correct)
  • To provide navigation to other apps.

What method is used to override options item selection in Android?

  • onOptionsItemSelected() (correct)
  • onCreateOptionsMenu()
  • onMenuOpened()
  • onPrepareOptionsMenu()

Which of the following is NOT a type of menu available in Android development?

  • Dialog menu (correct)
  • Popup menu
  • Options menu
  • Contextual action bar

Which element typically provides users with choices for actions relating to the content displayed on the screen?

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

Which menu item calls the showSettings() method when selected?

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

In which scenario are contextual menus most commonly used?

<p>For items in RecyclerView or GridView (B)</p> Signup and view all the answers

Which component is specifically mentioned as part of the App Bar's functionality?

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

What does the default case in the onOptionsItemSelected() method do?

<p>Calls the superclass implementation (C)</p> Signup and view all the answers

What is the purpose of the action overflow button in the app bar?

<p>To display the options menu (D)</p> Signup and view all the answers

What type of dialog would you use to allow users to select a specific date?

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

What is a defining feature of contextual menus in Android?

<p>They allow actions on selected Views (A)</p> Signup and view all the answers

Which of the following is the first step in implementing an options menu?

<p>Create XML menu resource (A)</p> Signup and view all the answers

Which of the following menus allows for instant actions without occupying much screen space?

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

What purpose does the action overflow button serve in the App Bar?

<p>To provide additional options when the main menu is full. (A)</p> Signup and view all the answers

Which statement about adding menu item attributes is true?

<p>Attributes can be set for individual menu items (D)</p> Signup and view all the answers

What method must be overridden to inflate the options menu in an Android Activity?

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

What type of View can contextual menus be deployed on?

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

Which menu type is designed to appear when the user performs a long press on an item?

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

When adding entries for menu items, which of the following is NOT a typical step?

<p>Providing the menu with a unique identifier (C)</p> Signup and view all the answers

What happens when the action_favorites menu item is selected?

<p>It shows a list of favorite items (B)</p> Signup and view all the answers

How can icons be added to menu items in an Android application?

<p>Right-clicking drawable and selecting New &gt; Image Asset (A)</p> Signup and view all the answers

Which of the following activities can be accessed through the options menu?

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

What does the onOptionsItemSelected() method handle?

<p>Responding to menu item clicks (D)</p> Signup and view all the answers

What is the position of the action overflow button in the app bar?

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

What is the main purpose of the onCreateContextMenu() method?

<p>To specify and create a context menu (B)</p> Signup and view all the answers

Which method allows you to handle selections made in a context menu?

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

In the onCreateContextMenu() method, which object is used to inflate the menu layout?

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

What action does the context item with the ID R.id.context_edit perform?

<p>Edits a note (B)</p> Signup and view all the answers

Which of the following statements about dialogs is NOT true?

<p>Dialogs can show multiple menus at once. (B)</p> Signup and view all the answers

What elements can an AlertDialog include?

<p>Title, content area, actions (B)</p> Signup and view all the answers

What is the purpose of calling super.onContextItemSelected(item)?

<p>To invoke default behavior for unhandled items (B)</p> Signup and view all the answers

Which method allows a user to pick a time from a dialog?

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

What method is used to create an alert dialog in the provided code?

<p>AlertDialog.Builder() (D)</p> Signup and view all the answers

Which method allows you to set the action for the positive button in an AlertDialog?

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

What does the method alertDialog.setMessage() do in the given example?

<p>Sets the content message of the dialog (C)</p> Signup and view all the answers

What does the DialogInterface.OnClickListener do in the context of an AlertDialog?

<p>It handles user input on the dialog buttons (C)</p> Signup and view all the answers

If a developer wants to add a neutral button to the dialog, which method should they use?

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

What is the purpose of setting the title in an AlertDialog?

<p>To inform the user of the dialog's purpose (D)</p> Signup and view all the answers

Which of the following correctly describes the method call 'alertDialog.setNegativeButton()'?

<p>Sets a button that allows the user to cancel an action (B)</p> Signup and view all the answers

In the provided code, which parameter does 'setPositiveButton()' require to function correctly?

<p>A listener for the button's click action (C)</p> Signup and view all the answers

What is the primary function of a floating context menu?

<p>Perform actions on one View at a time (B)</p> Signup and view all the answers

Which of the following best describes contextual action mode?

<p>An action bar that replaces the app bar temporarily (A)</p> Signup and view all the answers

What is the first step in creating a floating context menu?

<p>Create an XML menu resource file (C)</p> Signup and view all the answers

In which method should the context menu be inflated for a View?

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

What is the purpose of the method onContextItemSelected()?

<p>To handle user interactions with menu items (A)</p> Signup and view all the answers

Which line of code is necessary to register a TextView for context menus?

<p>registerForContextMenu(article_text); (A)</p> Signup and view all the answers

What is the main focus of contextual action mode in regards to Views?

<p>It allows actions to be performed on selected View element(s) (B)</p> Signup and view all the answers

After creating an XML menu resource file, which step follows next in building a floating context menu?

<p>Register the View using registerForContextMenu() (D)</p> Signup and view all the answers

Flashcards

onOptionsItemSelected()

A method that is called when the user selects an item from the menu bar.

Contextual Menus

A feature in Android that allows users to perform actions on selected views, commonly used in RecyclerView, GridView, or other view collections.

Add menu item attributes

A way to add options to your app's menu bar, allowing users to access various features.

Pickers

A user interface component that allows users to select options or make choices, often displayed as a list or dropdown.

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Menu bar

A visual element that appears at the top of an Android app's screen, providing access to actions like settings, favorites, or other functions.

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Action overflow button

The three dots icon in the app bar that reveals the options menu.

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Options menu

A menu displayed in the app bar, accessed by tapping the action overflow button.

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Creating a menu resource

Creating a menu resource file in your Android project.

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Inflating an options menu

Inflating an options menu involves connecting the menu resource to your activity's layout.

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Handling menu item clicks

Handling menu item clicks by implementing an 'onOptionsItemSelected()' method.

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Setting up menu item clicks

Setting up a click listener or using the 'onClick' attribute in your menu resource file.

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onCreateOptionsMenu()

You can use this method to inflate the options menu in your activity.

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App Bar

The bar appearing at the top of every activity screen in your Android application, providing key features like navigation, title, and options.

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Context Menu

A menu accessed by selecting a specific view element within an activity.

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Contextual Action Bar

A menu available on the action bar, typically called by a floating action button or other triggers.

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onCreateContextMenu()

A method used to create a context menu, which is a menu that appears when a user long-presses on a specific view.

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Popup Menu

A small menu that pops up when a button or an icon is tapped, offering a list of choices to the user.

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Alert Dialog

A dialog box that displays a message and usually a button to dismiss it. Often used for notifications or warnings.

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onContextItemSelected()

This method handles the events triggered when the user selects an item from the context menu.

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Date Picker

A widget that allows the user to select a date. Used in calendars, reminders, and scheduling.

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Dialog

A dialog box that appears on top of the current activity and requires user interaction to dismiss.

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TimePickerDialog

A dialog that allows the user to select a time.

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DatePickerDialog

A dialog that allows the user to select a date.

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AlertDialog

A dialog that provides a variety of options to the user.

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Content area of AlertDialog

A text area that displays the message of the AlertDialog.

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AlertDialog.Builder

Creates an AlertDialog instance, allowing customization of its appearance and actions.

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alertDialog.setTitle()

Sets the title displayed at the top of the AlertDialog.

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alertDialog.setMessage()

Sets the message content to be displayed within the AlertDialog.

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alertDialog.setPositiveButton()

Defines a positive action button, typically confirming the user's intent.

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alertDialog.setNeutralButton()

Defines a neutral action button, often providing an alternative option.

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alertDialog.setNegativeButton()

Defines a negative action button, usually canceling or rejecting the user's intent.

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DialogInterface.OnClickListener

An object that implements DialogInterface.OnClickListener is used to define the action to be performed when a button is clicked.

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Floating Context Menu

A context menu that appears in a floating window when you long-press on a particular View. It allows you to interact with the View in some way.

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Contextual Action Mode

A temporary action bar that appears on the screen, often replacing the app bar. It allows you to perform actions on the currently selected View elements.

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registerForContextMenu()

A method that allows you to define a View that can trigger a context menu.

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Create XML Menu Resource

The process of creating the menu XML file (named menu_context.xml) that defines the layout and appearance of your context menu.

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Perform Action for Context Menu Items

In your code, creating a method that actually performs the action associated with each context menu item.

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Study Notes

Android Developer Fundamentals V2 - Menus

  • Android menus are used to display options for users in an app
  • Types of menus include app bars, context menus, contextual action bars, and popup menus
  • Dialogs are another type of user interface element that frequently appears in conjunction with menus

App Bar with Options Menu

  • The app bar is a standard element at the top of most Android screens
  • It typically includes a navigation icon, activity title, options menu icons, and an overflow button
  • This is a common user interface design pattern across Android devices
  • The options menu appears when the overflow button is pressed
  • Action icons in the app bar show important actions for the app
  • The three-dot overflow button opens a full menu of options

Adding Options Menu

  • Create an XML menu resource that defines menu items
    • (Menu XML example menu_main.xml)
  • Use onCreateOptionsMenu() in the Activity to inflate the menu.
  • Respond to item clicks with onOptionsItemSelected() or appropriate attributes like android:onClick.

Contextual Menus

  • Contextual menus are triggered by actions (e.g., long-press) on specific parts of the screen.
  • They provide context-specific actions for a particular view in the app.
  • These menus appear on the screen near the user's input (long-press).

Steps for a Contextual Menu

  • Create menu_context.xml for menu items
  • Register a view to onCreateContextMenu to define which view should show a menu
    • (Example: registerForContextMenu(article_text);)
  • In onCreateContextMenu(...):
    • Get menu inflater from the context
    • Inflate menu: inflater.inflate(R.menu.menu_context, menu);

Dialogs

  • Dialogs appear as overlaying windows on top of the main app window.
  • Dialogs give users choices or more information
  • Dialogs interrupt the app's flow until the user acts.
  • Types of dialogs include alert dialogs, date pickers, and time pickers.

Building an AlertDialog

  • Use AlertDialog.Builder to build dialogs with a title, content, and buttons
  • Buttons must use setPositiveButton, setNegativeButton, or setNeutralButton methods of the builder to implement functionality
  • In onClickShowAlert, create and configure the builder
  • Create different methods to handle button clicks for appropriate responses

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