Android Resource Management Quiz

Questions and Answers

What is the purpose of organizing resources into specially named directories in Android?

To provide alternative resources for specific device configurations at runtime.

What directory do all resources in an Android project need to be stored in?

/res directory

How does Android handle the selection of resources based on device configuration?

Android automatically selects the correct resources without requiring user intervention.

Describe the role of the R.java file in accessing resources programmatically.

The R.java file enables access to all resources by referencing their IDs programmatically. Signup and view all the answers

In which sub-directory are tween animations stored in an Android project?

res/anim/ Signup and view all the answers

Why is it beneficial to keep non-code resources external to the application's code?

It eases the management, maintenance, and updates of these resources. Signup and view all the answers

What are color state list resources used for in Android applications?

They define a color resource that changes based on the view state. Signup and view all the answers

What function does the ADT plug-in serve in the management of resources in Android development?

It automatically detects new resource files added to the project. Signup and view all the answers

What method is used to set a listener for the negative button in an AlertDialog?

setNegativeButton Signup and view all the answers

Which class must you extend to create an Android activity like MainActivity?

AppCompatActivity Signup and view all the answers

What is the purpose of the `setTitle` method in the AlertDialog.Builder?

To set the title displayed in the dialog. Signup and view all the answers

What layout method is called to display the custom view within the AlertDialog?

setView Signup and view all the answers

How does the AlertDialog react when the positive button is clicked according to MainActivity's implementation?

It shows a Toast message saying 'Thanks for Accepting'. Signup and view all the answers

What does the `finish()` method do in the negative button's click listener?

It closes the current activity. Signup and view all the answers

What is the role of a theme in Android app development?

A theme applies a collection of attributes to an entire app or activity. Signup and view all the answers

In which lifecycle method is the AlertDialog created and shown in MainActivity?

onCreate Signup and view all the answers

What directory do you need to copy the ICLS file to for theme application in Android Studio?

%USERPROFILE%/.AndroidStudio/config/colors Signup and view all the answers

What are the four arguments required by the add() method when creating a menu item?

groupId, itemId, order, title Signup and view all the answers

Which method do you override to display the options menu in an activity?

onCreateOptionsMenu() and onOptionsItemSelected() Signup and view all the answers

How can you assign a keyboard shortcut to a menu item in Android?

Use the setAlphabeticShortcut() method. Signup and view all the answers

What does the MenuChoice() method accomplish in the context of Android menus?

It checks the ID of the clicked menu item and displays a Toast message. Signup and view all the answers

What is the purpose of the android:theme attribute in the AndroidManifest.xml file?

It is used to apply a selected theme to the app's UI. Signup and view all the answers

What function is used to insert an image into a menu item?

setIcon() Signup and view all the answers

What is the purpose of the CreateMenu() method in Android?

It adds a series of menu items to a Menu object. Signup and view all the answers

What are the two types of intents in Android, and how do they differ?

Public (named) intents can be registered with the system for use by any application, while private (anonymous) intents are used within a single application. Signup and view all the answers

What is the purpose of a dialog in Android applications?

A dialog is a small window that prompts users to make decisions or provide additional information. Signup and view all the answers

Why should the Dialog class not be instantiated directly in Android?

The Dialog class serves as a base class, and its subclasses provide specific implementations that should be used instead. Signup and view all the answers

What features can an AlertDialog in Android include?

An AlertDialog can include a title, a message, up to three action buttons, selectable lists, or a custom layout. Signup and view all the answers

Describe the three regions that compose the Android AlertDialog.

The three regions are the title, content area, and action buttons. Signup and view all the answers

What types of action buttons should be included in an AlertDialog, and what is their purpose?

Action buttons include positive (to accept), negative (to cancel), and neutral (for indecision) buttons. Signup and view all the answers

When is it acceptable to omit the title in an AlertDialog?

The title can be omitted when presenting a simple message or question that doesn't require a heading. Signup and view all the answers

What is the difference between DatePickerDialog and TimePickerDialog?

DatePickerDialog allows users to select a date, while TimePickerDialog enables users to select a time. Signup and view all the answers

What method is called when the MENU button is pressed in an Android activity?

onCreateOptionsMenu() Signup and view all the answers

How can you associate a context menu with a view in an Android activity?

By calling the setOnCreateContextMenuListener() method. Signup and view all the answers

In the provided code, what action occurs when a menu item is selected?

The onOptionsItemSelected() method is called. Signup and view all the answers

What is the purpose of the Toast message in the onOptionsItemSelected() method?

To display the selected menu item's title. Signup and view all the answers

What is the correct method to inflate a menu in an activity?

getMenuInflater().inflate() Signup and view all the answers

Why would you register a view for a context menu in an Android activity?

To enable a context menu to be shown when the view is long-pressed. Signup and view all the answers

What class needs to be extended to create a custom activity for menus in Android?

AppCompatActivity. Signup and view all the answers

What is displayed when the user long-clicks on a Button view if a context menu is set up?

A context menu with options related to that view. Signup and view all the answers

What function does the onCreateContextMenu() method serve?

It creates and populates the context menu. Signup and view all the answers

What should be returned at the end of the onOptionsItemSelected() method if none of the menu items were selected?

super.onOptionsItemSelected(item) Signup and view all the answers

Study Notes

Android Resources

Android organizes alternative resources in specially named directories for device configurations.
Resources are selected at runtime based on device characteristics, language, and other settings.
Common resource types include layouts, graphics, strings, and animations, which are stored in the /res directory.
Graphics files are specifically stored in the /res/drawable folder.
Externalizing resources simplifies management and allows updates without altering the code.
The ADT plug-in detects new resource files and compiles them into R.java, enabling programmatic access to resources.

Resource Types

Animation Resources:
- Tween animations stored in /res/anim/, accessed via R.anim.
- Frame animations stored in /res/drawable/, accessed via R.drawable.
Color State List Resource:
- Defines colors that change based on the view's state.

Intents

Two categories of intents:
- Public intents registered with the system, accessible by any application.
- Private intents used within a single application.

Dialogs

Dialogs are small windows prompting user action without filling the screen.
Base class: Dialog; use subclasses like AlertDialog, DatePickerDialog, or TimePickerDialog for specific functionalities.
AlertDialog:
- Composed of a title, content area, and action buttons (max of three: positive, negative, and neutral).
- Positive button accepts an action, negative cancels it, and neutral allows proceeding without confirmation.

Methods for AlertDialog

setNegativeButton(CharSequence text, DialogInterface.OnClickListener listener): Sets a listener for the negative button.
setTitle(CharSequence title): Sets Dialog title.
setView(View view): Sets a custom view for the Dialog.
show(): Creates the dialog instance and displays it.

Themes in Android

Themes apply to apps, activities, or view hierarchies, affecting all supported attributes.
Themes can be downloaded, copied to the configuration directory %USERPROFILE%/.AndroidStudio/config/colors, and applied in the manifest.

Menus

Two main types of menus: Options Menu and Context Menu.
Options Menu:
- Activated by the MENU key; defined in onCreateOptionsMenu() and handled in onOptionsItemSelected().
Context Menu:
- Associated with specific views; activated via long-click.
- Requires setting up a context menu listener on the view using setOnCreateContextMenuListener().

Sample Code Overview

Includes implementation examples for setting up AlertDialog and menus in MainActivity.java and XML layout files, demonstrating how to create and manage user interactions effectively.

Settings

Android provides a framework for defining and displaying application preferences easily with minimal code.

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Description

Test your knowledge on Android's resource management system. This quiz covers how Android selects resources based on device configurations such as screen size and language settings. Sharpen your understanding of optimizing UI and data resources for different devices.