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In App Inventor, what is the primary function of the 'Component Designer' tool?

  • To define the algorithms and data structures that determine component behavior.
  • To test and debug the app on an Android phone or emulator.
  • To manage the app's data storage and retrieval.
  • To create the visual elements and layout of the app's user interface. (correct)

Which term describes App Inventor's coding approach, where users visually assemble blocks to create app logic?

  • Imperative programming
  • Functional programming
  • Object-oriented programming
  • Visual programming (correct)

Which action refers to the process of testing your App Inventor project on a virtual device?

  • Prototyping
  • Component Designing
  • Emulating (correct)
  • Blocking

In App Inventor, what is the purpose of the 'Blocks Editor'?

<p>To define the app's logic and behavior using visual blocks. (C)</p> Signup and view all the answers

When designing mobile applications in App Inventor, what does GUI refer to?

<p>Graphical User Interface (B)</p> Signup and view all the answers

Which type of programming structure involves executing instructions in the order they appear?

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

In App Inventor, which category of components allows an app to access a device's GPS data?

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

What is the primary purpose of the 'Layout' category in the App Inventor palette?

<p>To arrange components horizontally, vertically, or in a tabular format. (B)</p> Signup and view all the answers

An app requires the ability to send text messages. Which component category in App Inventor would contain the necessary tools?

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

Which statement is correct about naming components in App Inventor?

<p>Component names must start with a letter. (B)</p> Signup and view all the answers

In App Inventor, what is the first step in modifying a component's properties?

<p>Click on the component's name in the Components column. (B)</p> Signup and view all the answers

In the App Inventor environment, what is the term for code blocks that automatically run when a specific event happens?

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

You want to save user preferences locally on a device. Which component category in App Inventor provides this functionality?

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

What is the primary purpose of the 'Viewer' in MIT App Inventor?

<p>Provides an interactive preview of the app's layout. (B)</p> Signup and view all the answers

When organizing components on the screen, how does setting the Screen's AlignVertical property to 'Bottom' affect the layout?

<p>Components will be aligned to the bottom of the screen. (A)</p> Signup and view all the answers

In App Inventor, you have a button named 'Button1'. What type of block is specifically associated with this button's click action?

<p>An Event Handler block (A)</p> Signup and view all the answers

Which of the following would be a permissible name for a component?

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

Which App Inventor tool is used to visually lay out and arrange the user interface components of an app?

<p>The Component Designer (C)</p> Signup and view all the answers

In App Inventor, what happens if you try to assign an invalid name to a component?

<p>App Inventor displays an error message. (A)</p> Signup and view all the answers

How do you test an App Inventor application on your computer?

<p>By using the built-in emulator. (A)</p> Signup and view all the answers

What is the purpose of the Title property in the Screen component?

<p>It displays text in the screen's title bar. (C)</p> Signup and view all the answers

An app needs to store a list of high scores. Which component would be most suitable for this purpose?

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

When would you typically use a 'HorizontalArrangement' component from the 'Layout' section of App Inventor?

<p>To organize components in a horizontal row. (D)</p> Signup and view all the answers

Where can you find the 'Math' drawer, which contains blocks for addition, subtraction, and other math functions?

<p>In the blocks editor (A)</p> Signup and view all the answers

If an App Inventor app needs to play audio, which component would be used?

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

In the properties section, the app's screen's AlignHorizontal property is set to Left. How will components be aligned?

<p>Components will be aligned to the left (D)</p> Signup and view all the answers

What is a key feature employed by App Inventor?

<p>Fixed or flexible screen orientations (B)</p> Signup and view all the answers

In App Inventor, what term best defines the actions a button takes, such as when it triggers a change on the screen?

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

What is the first step when using the palette to create the layout for a new app?

<p>Dragging components over to the viewer (B)</p> Signup and view all the answers

What needs to happen for a new component to appear in the Component column?

<p>It is dragged from the palette. (A)</p> Signup and view all the answers

What is the next most important step after selecting a component and dragging it to the viewer?

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

Which statement is true about the Screen1 in App Inventor?

<p>Its default name cannot be changed. (D)</p> Signup and view all the answers

Which is not a step to build actions on screen?

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

Which property determines how components are laid out vertically?

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

Which property is important for Screen1?

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

Which statement is not true about components and App Inventor?

<p>Properties need to be set in the emulator. (B)</p> Signup and view all the answers

What property can you adjust if a button's label needs to take up more space?

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

What can be gathered from the Viewer column?

<p>Rough visualization of the application. (C)</p> Signup and view all the answers

What column shows available components?

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

Which command is triggered when the buttons are triggered?

<p>Do set when clicked (D)</p> Signup and view all the answers

Flashcards

What is App Inventor?

A visual programming environment used to create mobile applications for Android devices, originally created by Google Labs and now hosted at MIT. The project is open source.

App Inventor Explore

A collection of resources, tutorials, and tools designed to help users learn and explore the MIT App Inventor platform.

Component Designer

A tool within App Inventor that allows you to visually design the user interface of your app by adding and arranging components.

Blocks Editor

A tool within App Inventor where you use blocks to define the behavior of the components in your app, essentially writing the code.

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App Inventor Emulator

A virtual mobile device on your computer used to test and run your App Inventor applications during development.

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Graphical User Interface (GUI)

Graphical User Interface: is the visual part of the application that the user will interact with.

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Sequential operations

The order in which program instructions are executed

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Conditional operations

Also called decisions, will allow a program to choose between different paths, that is, different operations, depending on whether some condition is true or false

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Repeated operations

An operation that is executed repeatedly as long as some condition is true.

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Components in MIT App Inventor

Visible or non-visible 'objects' with defined properties and behaviours.

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Palette Column

The column in App Inventor's Designer that lists available components that can be added to your app.

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Viewer Column

The column in App Inventor's Designer that shows a 'rough' visualization of how the app interface will appear.

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Components Column

The column in App Inventor's Designer that lists components currently added to your project.

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Palette in App Inventor

Available component types.

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Layout components

This section provides components for organizing other components on the app's screen. They provide ways to arrange components horizontally, vertically, or in rows and columns.

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Media components

This section provides components for taking photos, recording and playing videos, recording and playing sounds, picking images from the phone's gallery, recognizing speech, and converting text to speech.

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Sensors components

These components allow your app to access the device's accelerometer. sensors allow two phones to exchange data.

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Social components

These are components that work with the phone's contact list, make phone calls, send and receive text messages, and perform certain operations with Twitter.

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Connectivity components

Connectivity components provide for launching external applications, connecting with Bluetooth devices, and browsing the Web..

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Lego Mindstorm

LEGO® MINDSTORM®-These specialized components are used to connect an app for LEGO MINDSTORM robot using Bluetooth.

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Always change App Inventor's Title.

Title – ALWAYS change exception is Screen1

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MIT App Inventor Button Function

Buttons are GUI components, also called Action and React to a User Initiated Event

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Designer Button

Click from any tab to go to the Designer tab

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Blocks

In App Inventor, use Blocks to set App Behaviour/ logic to set app behavior.

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Event handler

An Event handler is a block that automatically executes when a specific event takes place. Also known as Brown blocks that are shaped liked this.

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reset the screen

The app should have a "white" background when it starts and the "Reset" button will reset the screen

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Study Notes

  • Lecture explores MIT App Inventor 2, an environment used for developing mobile applications

Agenda

  • The content covers an introduction to App Inventor, the steps to get started, how to handle events, and components
  • Getting started involves designing user interfaces, creating blocks or code, and testing with an emulator
  • Handling events includes button actions and component behaviors

What Is App Inventor?

  • App Inventor is a visual programming environment for creating mobile applications for Android devices like phones and tablets
  • It was originally created by Google Labs
  • It's now hosted at MIT
  • It is an open-source project

Explore: Setup and Tutorials

Installer

  • The installers can be accessed at these URLs
  • https://appinventor.mit.edu/explore/ai2/windows
  • https://appinventor.mit.edu/explore/ai2/mac

AI - Projects

  • Inventor is an option to create or modify App Inventor Projects

App Inventor Tools

  • App Inventor consists of three tools working together
  • Componenent Designer defines the Graphical User Interface (GUI) and Non-GUI
  • Blocks editor determines the behaviour of components using algorithms and data structures
  • Android phone or emulator is a platform for testing/using the apps

App Inventor Development Cycle

  • Development cycle includes stages for Design/Redesign, Create User Interface, Code Blocks, and Test/Debug
  • Paper/Pencil in the design stage
  • Component Designer creates the user interface
  • Blocks Editor is used to test and debug
  • Implementation on a Phone/Emulator

App Inventor In Practice

  • Hands-on examples cover family engagement apps using prompts and emojis to share thoughts
  • The translated texts are translated via Google translate

Creating A Project

  • Steps for creating a new project are outlined:
  • Palette: Consists of User Interface, Layout, Media, Drawing and Animations, Sensors, Social, Storage, Connectivity, Lego Mindstorms etc
  • Viewer
  • Components
  • Designer/Blocks: Set parameters and their values

Running With Emulator

  • An emulator and USB connection are options

Projects Page

  • A Projects page is available to manage existing and new projects

AI Components/Events

  • Event-based programming relies on visible or non-visible objects (components) with defined properties and behaviors
  • Properties are visible or non-visible
  • Behaviors defines what they can do
  • The component designer is used to set the initial setting

AI Component Designer

  • Palette: Available component types
  • Viewer: The rough visualization of an app
  • Components: The existing components in a project
  • Properties: Initial settings/properties for the components

Palette Column

  • The Palette in App Inventor provides components to build your app.
  • Components perform specific purposes within apps, such as displaying images (Image component), creating buttons (Button component), sending/receiving texts (Texting component), and dialing numbers (PhoneCall component).

Palette Organization

  • The Palette is grouped by type
  • An action consists of selecting a component and dragging it to the Viewer with its default name
  • Components gives a MEANINGFUL NAME
  • Default property values are changed

Media

  • Media section hosts components for taking pictures, playing videos, recording audio, picking images from the phone's gallery, recognizing speech, and converting text to speech

Layout

  • A Layout section provides components for organizing other components either horizontally, vertically, or in rows and columns

Drawing and Animations

  • Provides components for creating simple drawings and animations

Sensors

  • Allows the app to access accelerometer to detect shaking and movement
  • The location sensor detects the device’s location
  • Orientation sensor detecs the device’s orientation
  • Barcode scanner components and near file communication components are also options

Social

  • Allows for phone capabilities like contact lists and perform certain operations with Twitter

Storage

  • Components here store data locally or remotely on a Web server Connectivity: Provides components for launching external applications, connecting with devices via Bluetooth, and web browsing

Lego Mindstorms

  • Connects an app with robots using Bluetooth

Screens

  • Different properties are default to the Component Designer
  • Background image: May need to resize
  • Icon: Used on devices only (50x50)
  • ScreenOrientation: Fixed or Flexible
  • Scrollable
  • Includes Title and Version

Design

  • The design stage involves dealing with GUI components and adjust location and properties of the mobile platform/emulator

Editing Using Viewer

  • Viewer arranges manage app components by dragging and dropping elements onto a simulated mobile screen as an interactive preview

Component Column

  • Shows a hierarchical tree listing of the components that you have placed in your app

Naming Conventions

  • Best practice is giving every component a name
  • CHANGE the default name of a component being used in an algorithm
  • Buttons have a btnName convention
  • Textboxes have a txtbName convention

Behavior

  • Behavior represents the logic of an application, consisting of sequential, conditional, and repeated operations

Blocks Editor

  • Blocks Editor is used to define the app behavior

Button Actions

  • Buttons are GUI components with typical use as Input
  • There are Actions that react to an initiated event

Programming Blocks

  • Find components and drag them to the viewer
  • Designer button navigates from any tab
  • Select a component in the Component List to change properties like color, size, and behavior

Blocks Organization and Implementation

  • Built-In Drawers: used generally
  • Component-Specific Drawers: special use cases
  • Blocks Viewers used in the app

Block Navigation

  • The block editor are divided into categories of controls, Logic, Math, Text, Colors etc
  • Additional components and properties are available depending on screen

Program Blocks

  • Built-In Blocks: The basic blocks that make up the App Inventor
  • Screen1: Add a component to Screen1, a set of component blocks are blocks that perform an action on a specific component that you have added to the app
  • Any component: The section contains advanced blocks that allow work with any app component

User Interfaces Components, Properties, and Behaviors

  • There is typically a user interface section, which contains parameters and behaviours that determine how a screen loads, actions and variables can be selected

Components Changes

  • Changing a Component's Name requires the component to be selected in the Components column

Screen Alignement

  • Screen components also have an AlignVertical property that determines how the components that are contained in the screen are vertically aligined.

Labs - ColourMe

  • Take-home exercise requires an interactive app coded in blocks that changes the colour of a screen which features buttons and a screen and algorithm that has "Events"

Tutorials for Program

  • The text provides examples from good morning programs and translating phrases from click events

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Description

This lecture introduces MIT App Inventor 2, a visual environment for developing mobile applications. It covers setup, UI design, event handling, and component usage. Learn to create Android apps through tutorials and examples.

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