Скачать или смотреть How to Store a List of Floats in Firebase Realtime Database

Learn how to properly store a list of `Floats` in Firebase Realtime Database by adhering to JavaBeans standards. Get step-by-step guidance and best practices!
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How to Store a List of Floats in Firebase Realtime Database

When it comes to developing applications that require the collection and storage of user touch data, developers often turn to platforms like Firebase Realtime Database for its ease of integration and real-time capabilities. However, a common challenge many face is figuring out how to effectively store a list of Floats, especially when dealing with trajectory data from user touch events. In this guide, we'll dive deep into the problem and provide you with a clear solution to efficiently store lists in Firebase.

The Problem at Hand

In a recent scenario, a developer was working on capturing the trajectory of user touches on an Android app. This involved storing lists of floating-point values representing the x and y coordinates of touch events. However, upon attempting to save these lists into Firebase using a class (TouchData), the other fields were getting stored correctly, but the lists were not. This raised the question — Is storing lists in Firebase not allowed, or is there a specific implementation issue at play?

The Solution

To successfully store lists of Floats (like x and y trajectories) in Firebase, it’s essential to ensure that your class properties adhere to JavaBeans naming conventions. Let's break this down step-by-step.

Understanding JavaBeans Standards

Firebase uses reflection to serialize objects, and it relies on the getter and setter methods to access class properties. For it to correctly map your properties to Firebase nodes, the method names must follow specific rules.

Steps to Follow:

Update Property Names: Change your list properties to follow JavaBeans conventions. For instance:

Existing property:

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

Updated property:

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

Modify Setter and Getter Methods: Correspondingly update your setter and getter methods:

Setter:

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

Getter:

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

Repeat for Other Fields: Apply this same principle to all properties in your TouchData class. For example:

Touch Duration:

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

Full Example of TouchData Class

Here's how your updated TouchData class should look after applying the above principles:

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

Final Thoughts

After you’ve ensured your class adheres to JavaBeans standards, your lists of floats should be stored successfully in Firebase Realtime Database. This change not only fixes the storage issue but also makes your code cleaner and easier to understand.

Storing complex data types in Firebase is manageable with small adjustments, and following JavaBeans conventions is a key takeaway for developers working with Firebase.

By carefully naming properties and methods, you'll harness the full potential of Firebase's data storage capabilities without a hitch. Happy coding!