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Learn how to show a loading indicator in your Flutter app while uploading files to Firebase. Discover the step-by-step approach to enhancing user experience during file uploads.
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How to Render a Loader While Uploading Files on Firebase Using Flutter

Uploading files can be a time-consuming process, especially when dealing with larger files like PDFs. When users click the upload button, they often want feedback on the progress of their action. Providing a visual indication, such as a loader, can greatly enhance the user experience. In this post, we'll explore how to create a loader while uploading files to Firebase using Flutter.

The Problem

When you use the savePdf() function to upload a file to Firebase, there’s significant processing involved. During this time, users can experience uncertainty. They might wonder if the upload is in progress or if the app has frozen. Instead of leaving them in the dark, you want to inform them that the upload is ongoing, utilizing a loading indicator such as a CircularProgressIndicator.

Solution Overview

To implement this, you can introduce a boolean variable called isLoading in your state. When the upload begins, you will set isLoading to true, which will display the loader. Once the upload is complete, set isLoading to false to hide the loader. Let’s break down the steps needed to implement this solution effectively.

Step-by-Step Implementation

1. Define the isLoading State

First, ensure that you have a boolean variable to keep track of whether the upload is in progress:

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2. Modify the onPressed Event

Next, you need to modify your button’s onPressed event to set the isLoading state accordingly. Here’s how you can do it:

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

3. Update the Widget Tree

In your widget tree, you will need to conditionally show the loader. Here’s an example using a CircularProgressIndicator:

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

Complete Implementation Example

Putting it all together, your code may look something like this:

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

Conclusion

Using a loader during file uploads not only improves user experience but also adds a professional touch to your application. By following the steps outlined above, you can seamlessly integrate a loading indicator into your Flutter app when uploading files to Firebase. Remember, keeping users informed during long processes like uploads is key to maintaining engagement and satisfaction with your app.

Now you’re ready to implement this in your Flutter app. Happy coding!