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Learn how to efficiently synchronize data to your server in your Flutter app, regardless of internet connectivity. Discover the best libraries to use for seamless data caching.
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How to Synchronize Sending Data to a Server in Flutter, No Matter the Internet Availability

In the world of mobile applications, creating a seamless user experience is paramount. One common challenge developers face is how to manage data synchronization with a server when internet connectivity is inconsistent. This guide will guide you through the process of ensuring that your app can send data to a server even when the internet is not available, and then automatically send any stored data once the connection is restored.

Understanding the Problem

Imagine you are using a mobile app that requires you to input some data—perhaps a comment, feedback, or an update. If you're in an area with a poor internet connection, you might get frustrated if the app prevents you from submitting that data. Your app should be able to save this data temporarily until the internet becomes available again, at which point it should send it to the server without requiring any extra action from the user.

The Solution: Data Caching and Synchronization

To effectively synchronize data between your app and the server, you need to implement a caching mechanism. This means using a local storage solution to keep the data until you can successfully send it to your server. Below are the types of libraries you can use to accomplish this.

Recommended Libraries

Dio HTTP Cache:

The dio_http_cache plugin is a robust solution that allows for easy caching of HTTP requests and responses.

It helps manage storing requests and re-sending them when the internet is available.

Sqflite:

Sqflite is a Flutter plugin that provides a way to access SQLite databases. This is great for more complex data storage needs and allows you to create structured databases to hold your temporary data.

Hive:

Hive is a lightweight and fast NoSQL database for Flutter applications. It is easy to use and works well for storing simple key-value pairs and data objects that your app may need while offline.

How to Implement Data Synchronization

Here’s a simple outline to get you started with synchronizing data in your Flutter app:

Setup Dependencies: Add the necessary dependencies to your pubspec.yaml file. Choose between dio, sqflite, or hive based on your app's needs:

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Check for Connectivity: Use the connectivity_plus plugin to determine whether your app is online or offline:

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Store Data Locally When Offline: If there’s no internet, save the data using your chosen local storage method:

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Send Data When Online: When the connectivity changes and the internet connection is restored, retrieve your stored data and send it to your server:

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Conclusion

Implementing offline data synchronization in your Flutter application not only improves the user experience but also ensures data integrity. By using libraries like dio_http_cache, sqflite, or hive, you can easily manage data storage and transmission. Remember to respect the user’s experience by handling errors and providing feedback when syncing occurs.

Now you’re equipped with the knowledge to effectively manage data synchronization in your Flutter app, regardless of internet availability. Happy coding!