How to Upload Multiple Images to Firebase Storage at Once Using Flutter

Learn how to efficiently upload multiple images to Firebase Storage simultaneously with Flutter. Avoid issues of uploads failing due to dependencies.
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Uploading Multiple Images to Firebase Storage at Once in Flutter

When working with Firebase Storage, a common requirement is to upload multiple images simultaneously. This can sometimes be a challenge, especially when the success of one image upload depends on others (for instance, in scenarios where images are interrelated). Traditional solutions often involve using a loop to upload images one by one, which can lead to complications if some uploads succeed while others fail.

So, how can we upload multiple files to Firebase Storage at once without running into these issues? Luckily, there is a more efficient way using Dart’s asynchronous programming features.

Step-by-Step Code Example

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

Explanation of the Code

Function Declaration: The main() function initiates the upload operations.

Simulated Uploads: In the example, uploadImage1() and uploadImage3() successfully print their messages after a delay, while uploadImage2() throws an exception to simulate an error during the upload process.

Sample Output

When you run the above code, you’ll see the output indicating which uploads completed successfully and highlighting the exception:

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

Alternative Method: Using Await for Sequential Completion

If your application needs to ensure that certain images are uploaded before others, you can use await to wait for each upload to finish. Here’s an example:

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

Understanding This Alternative Code

The main() function is now marked as async, allowing us to use await in the function body.

Each upload is awaited sequentially, meaning that the next upload only begins after the previous one has successfully completed. If uploadImage2() fails, the subsequent uploads won’t execute.

Conclusion

By implementing the strategies discussed in this blog, you'll enhance the performance of your Flutter applications while simplifying your image upload process. Happy coding!