Flutter App Development Lecture 7
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Questions and Answers

What is the primary purpose of a splash screen in a mobile application?

  • To provide initial branding and identity recognition (correct)
  • To offer in-app purchases
  • To display user notifications
  • To show user settings

Which of the following is NOT a characteristic of a splash screen?

  • It may contain the app's logo
  • It serves as a welcome screen
  • It is the final screen of the app (correct)
  • It can show a loading progress indicator

What does the Stack widget in Flutter allow developers to do?

  • Overlap multiple widgets on a single screen (correct)
  • Display widgets only in a single column
  • Create a horizontal scrolling list
  • Align child widgets in a grid layout

How are positioned child widgets managed within a Stack in Flutter?

<p>They must be wrapped in a Positioned widget and have one non-null property (A)</p> Signup and view all the answers

What is the default alignment of non-positioned child widgets in a Stack?

<p>Top left corner (A)</p> Signup and view all the answers

Which statement accurately describes the order of child widgets in a Stack?

<p>Each child can overlap to block visibility of previous ones (C)</p> Signup and view all the answers

What can a splash screen display during its appearance?

<p>Loading progress indicator (A)</p> Signup and view all the answers

Which of the following statements about the alignment attribute in a Stack is true?

<p>It determines how non-positioned widgets are aligned within the Stack (B)</p> Signup and view all the answers

What must be done to reorder the children's widget in a stack?

<p>Rebuild the stack in the new order (D)</p> Signup and view all the answers

Which widget typically has the maximum size in a stack?

<p>The first widget of each stack (A)</p> Signup and view all the answers

In a Stack widget, how are multiple positioned children managed?

<p>They overlap each other based on the order of stacking (B)</p> Signup and view all the answers

What is the primary purpose of the Positioned widget in a Stack?

<p>To specify the exact coordinates of a child (D)</p> Signup and view all the answers

What is the maximum width constraint set for the Container in the example?

<p>$250$ (A)</p> Signup and view all the answers

Which style property is applied to the text 'Real Madrid' in the example?

<p>fontSize: $30$ and color: Colors.white (B)</p> Signup and view all the answers

What is the text displayed below the soccer icon in the example?

<p>'13 Champions league' (B)</p> Signup and view all the answers

How is the appearance of the container created in the stack achieved?

<p>Applying BoxDecoration with a color and borderRadius (B)</p> Signup and view all the answers

Flashcards

Splash Screen

A launching screen or initial display that welcomes users to an application. It commonly contains a logo, images, or software version information.

Splash Screen Purpose

Identifies the app's brand, displays loading progress, and provides a simple visual experience while the app prepares.

Flutter Stack Widget

A widget in Flutter that displays multiple widgets on top of one another. This allows for overlapping UI elements on a single screen.

Stack Widget Ordering

Widgets in a Stack are positioned based on their order - the first widget is at the bottom, the last widget is at the top.

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Positioned vs. Non-Positioned Children

Positioned widgets are wrapped in a 'Positioned' widget and require one non-null property for positioning. Non-positioned widgets rely on the Stack's alignment.

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Stack Alignment

The Stack widget allows you to change the alignment of its child widgets. By default, they are aligned to the top left corner.

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Non-Positioned Child Behavior

Non-positioned child widgets within a Stack are aligned based on the Stack's overall alignment. They are positioned accordingly.

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Stack - Topmost Widget

The last widget added to a Stack is displayed on top of other widgets within the Stack hierarchy.

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Stack widget

A widget that allows you to layer child widgets on top of each other. The first child added is the bottom layer, and subsequent children are added on top.

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Reordering stack children

To change the order of widgets in a Stack, the entire Stack needs to be rebuilt with the children in the desired order.

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Default size of Stack children

The first widget in a Stack typically takes the maximum size within the available space, unless constrained by other widgets or properties.

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Positioned widget

A widget used in a Stack to precisely position its child widget using coordinates like 'top', 'left', 'right', 'bottom'.

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Constraints in Stack

Limit the size of a widget within a Stack using 'constraints'. These constraints prevent widgets from expanding beyond the specified limits.

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Adding images to Stack

Use an Image widget within a 'Positioned' widget to display images in a specific location within the Stack.

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Adding text to Stack

Include a Text widget inside 'Positioned' to place text onto the Stack. Customize text style using 'TextStyle' for size and color.

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Adding icons to Stack

Use Icon widgets inside 'Positioned' and 'Row' widgets to display icons alongside text within the Stack.

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Study Notes

Flutter App Development Lecture 7

  • Course: Mobile Technologies, Semester 7, Fall 2024
  • Course Instructor: Hiwa Omer Hassan, [email protected]
  • Topic: Flutter App Development, Lecture 7

Today's Topics

  • Splash Screen
  • Stack Layout
  • Alert Dialog

Splash Screen

  • A splash screen is a launch screen, start screen, or boot screen.
  • It's a graphical control element.
  • It contains an image, logo, and current software version.
  • It appears when the application loads.
  • It can also function as a welcome screen, providing initial experience, especially for games or programs.
  • Primary usage: Branding and identity recognition for the application.
  • Displays loading progress indicator while the software initializes.
  • Hides when the app is fully loaded, transitioning to the home screen or dashboard.

Flutter Stack Widget

  • A widget in Flutter for overlapping multiple child widgets.
  • Renders widgets from bottom to top in the stack.
  • The first widget is the bottommost, and the last is the topmost.
  • Allows for easily overlaying elements on a single screen.
  • Children widgets can be positioned or non-positioned.

Stack Properties

  • alignment: Defines how children widgets are positioned within the stack (top, bottom, center, etc.).
  • fit: Controls the size of non-positioned children (loose, expand, passthrough).
  • overflow: Determines how content overflowing the stack is handled (visible, clipped).
  • clipBehavior: Sets how content within the stack is clipped (off, visible, clipped).
  • textDirection: Determines text direction (left-to-right or right-to-left).

Alert Dialog

  • A pop-up box for displaying important information.
  • Useful for prompting users to make decisions or take actions (e.g., confirmations).
  • Appears at the top-middle of the screen.
  • Can be manually dismissed by users.
  • Different types: Basic, Confirmation, Select, and Text Field.

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Related Documents

Flutter App Development Lecture Notes 7 (PDF)

Description

This lecture covers important aspects of Flutter app development, focusing on creating a splash screen and utilizing the Stack widget for layout management. Learn how to enhance user experience with graphical elements and manage multiple widgets effectively. Ideal for students in Mobile Technologies, Semester 7.

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