Divya-Dave-GDG-Ahmedabad-Speaker-Presentation.pdf

Unlock the power of Flutter to create flexible, maintainable, and high-performance user interfaces that adapt to any device and scale with your business needs.

1. Divya Dave
Senior Flutter Engineer & Program
Consultant
@Ogoul Technology
Senior Flutter Full-stack Developer | 5 Yrs Experience in
Scalable Mobile App Development | IoT, BLE, MQTT, Stripe,
Firebase, Node.js, MongoDB, Mongoose | Expert in Cross-
Platform Apps | Passionate about Clean UI & UX

2. Building Scalable Flutter UIs
with Dynamic & Reusable
Widgets
Unlock the power of Flutter to create flexible, maintainable, and high-performance
user interfaces that adapt to any device and scale with your business needs.

3. Why Scalability Matters in
Flutter UI Development?
Cross-Platform Power
With Flutter, you only need one
codebase to create apps for mobile,
web, and desktop. The real task is
making sure the app feels smooth
and user-friendly on every platform.
Performance at Scale
A scalable UI means the app can
handle more users, new features,
and larger amounts of data without
slowing down or making
development harder.
Maintainable Architecture
Using dynamic and reusable widgets makes the app easier to maintain. They let
you update or add features quickly while keeping the user experience consistent
throughout the app.

4. Dynamic Widgets: What & Why?
The Power of Runtime Adaptation
Dynamic widgets are smart UI components that change their look and behaviour
based on live data. This means your Flutter app9s interface can be updated instantly
no need to redeploy the app or wait for store approvals.
They make it possible to:
Update the UI instantly from the server
Run A/B tests with different UI versions in real time
Personalize the app for each user
Manage content without always needing a developer
Example:
Imagine a Flutter e-commerce app where the server sends JSON data
describing things like product cards, banners, and navigation menus. The
app can instantly update its UI for example, showing new designs or offers
during seasonal sales without needing an app update.

5. Reusable Widgets: Functions vs Classes
Widget Functions
These are best for simple, stateless UI elements like buttons, labels, or decorative parts of the app. Since they don9t rely on complex
logic or state, they9re fast, use very little memory, and are perfect for pure presentation.
Key benefits:
Low memory usage
Quick to compile and render
Great for simple, display-only components
Widget Classes
These are powerful widgets designed to handle state and complex business logic. They9re essential for interactive parts of your app
that react to user input and need to manage their own state.
Key features:
Complete lifecycle management
Built-in tools for handling state
Support for animations and advanced interactions
Best Practice: Use classes when building complex, stateful widgets that need lifecycle management. Use functions for simple, reusable UI
parts that only handle presentation.

6. Building Modular & Scalable Widget Architecture
01
Feature-Based Organization
Group your code into feature-based folders and
keep widget libraries separate. This makes it
easier to find things, helps your team
collaborate, and keeps different parts of your
app clearly separated.
02
Composition Over Duplication
Instead of repeating code, build complex
interfaces by combining smaller, reusable
widgets. This approach keeps your code clean
and ensures a consistent look across the app.
03
Shared Widget Libraries
Maintain a central library of common UI
components that can be used and customised
across different features. This keeps your
design consistent and saves development time.
A CustomButton widget with adjustable colours, sizes, and behaviours can be reused on the login, checkout, and profile screens. This
keeps the app looking consistent and reduces the effort needed to maintain the code.

7. State Management for Scalable UIs
Choosing the Right Solution
Effective state management is key to building scalable Flutter apps.
The way you handle state affects the app9s performance, how easy it is
to maintain, and how productive developers can be.
Provider
This approach works well for small to medium apps with simple
state needs. It9s easy to learn and implement.
Riverpod
This is an advanced approach that provides compile-time safety,
makes testing easier, and boosts performance for complex
applications.
BLoC Pattern
This approach is perfect for enterprise apps that need a clear
separation between business logic and the UI.
Efficient state handling reduces unnecessary widget rebuilds,
which greatly improves app performance and makes the user
experience smoother.

8. Real-World Example: Complex Floorplan UI with
Dynamic Data
Building an Interactive Architectural Interface
This comprehensive example demonstrates the practical application of dynamic and reusable widgets in a complex, data-driven user interface that
responds to real-world requirements.
1
Dynamic Data Loading
Build a sophisticated floorplan interface that dynamically renders
rooms, furniture, and interactive annotations from JSON data
sources, enabling real-time updates without app rebuilds.
2
Reusable Components
Implement modular widgets for room shapes, furniture elements,
labels, and measurement tools that can be composed into complex
layouts while maintaining consistency.
3
Interactive Features
Develop stateful widgets that handle sophisticated user
interactions including multi-touch zoom, pan navigation, room
selection, and contextual information display.
This project showcases advanced concepts including custom painters, gesture detection, coordinate transformations, and responsive
design principles.

9. Takeaway Task
Your Challenge: Dynamic Floorplan Interface
Put your new knowledge into practice with this hands-on exercise, designed to
strengthen your skills in dynamic UI design and smart widget reuse.
1Dynamic Data Integration
Create a Flutter app that dynamically loads floorplan data from a JSON
source, including zone-wise details. Each zone should display its own
information, and the background image should change accordingly to reflect
the current floorplan.
2Modular Widget Architecture
Design and build reusable widget components , so they can be combined to
create complex and flexible layouts.
3User Interaction Layer
Add responsive user interactions, like long-press to highlight a selected area,
and show relevant information immediately.
This exercise helps you practice key concepts like dynamic UI design, widget
reusability, and state management, resulting in a practical project that9s great for
your portfolio.

10. Connect with Me
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Follow for more Flutter tips, full code examples, and exclusive live coding sessions!

11. Thank You!
Questions? Let's build scalable, dynamic Flutter
apps together.
Your journey in advanced Flutter development doesn9t stop here. The concepts
covered so far lay the foundation for building outstanding mobile apps that can grow
and evolve with your ideas.
Reach out anytime via social media or email: [email protected]