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Learn how to create a responsive layout in Flutter that avoids unnecessary API requests when resizing the browser window.
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Achieving a Responsive Layout in Flutter without Repeated Future Builder Refreshes

Creating a responsive layout in Flutter web applications is a common requirement, especially as users resize their browser windows. However, when implementing responsive design using LayoutBuilder along with FutureBuilder, a potential issue arises: every time the LayoutBuilder rebuilds (which occurs on window resize), the FutureBuilder also rebuilds, causing unnecessary API requests. This can lead to performance issues and unexpected behavior in your application.

In this guide, we will explore how to design a responsive layout in Flutter while ensuring that your FutureBuilder does not refresh and resend API requests every time the layout is rebuilt.

Understanding the Problem

When using LayoutBuilder, it rebuilds its child widgets based on the incoming constraints. If your child widget is a FutureBuilder that fetches data from an API, each time the layout updates (like resizing the browser window), it triggers the FutureBuilder to rebuild as well. This results in repeated API calls which can lead to performance degradation and unwanted behavior in your application.

Proposed Solution

To solve this issue, we can follow these steps:

Use a StatefulWidget: Instead of using a StatelessWidget, switch to a StatefulWidget for your mobile, tablet, and desktop widgets. This allows you to maintain state across rebuilds.

Initialize Future in initState(): Create a variable to hold your Future instance and initialize it in the initState() method. This allows you to circumvent the rebuild triggering the API call again.

Implementing the Solution

Here’s how you can reframe your code to effectively manage the FutureBuilder while keeping the layout responsive:

Step 1: Change to StatefulWidget

Instead of keeping your layout in a StatelessWidget, create a StatefulWidget for your page:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Define Your Future Variable

In the state class, define a variable to hold the future:

[[See Video to Reveal this Text or Code Snippet]]

Final Thoughts

By using the above method, you maintain the responsive features of LayoutBuilder while ensuring that your FutureBuilder only fetches data once, preventing unnecessary API calls on layout changes. This improves performance and provides a smoother user experience in your Flutter web applications.

Using a StatefulWidget combined with proper state management for your Future can greatly enhance the efficiency of your Flutter applications.

Now, you can enjoy a fully responsive design without the headache of redundant API requests each time the layout changes!