Скачать или смотреть How to Get Text from Widgets in Flutter

Learn how to easily retrieve text from buttons and other widgets in Flutter. Follow this step-by-step guide to enhance your Flutter skills!
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This video is based on the question https://stackoverflow.com/q/65281461/ asked by the user 'rainer' ( https://stackoverflow.com/u/6269247/ ) and on the answer https://stackoverflow.com/a/65282532/ provided by the user 'chunhunghan' ( https://stackoverflow.com/u/2179571/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Get Text from Widgets in Flutter: A Beginner's Guide

If you're new to Flutter and coming from a Java background, you might find some of the functionalities challenging, especially when it comes to interacting with widgets and retrieving text from them. In this post, we'll explore how to get text from widgets in Flutter, particularly focusing on buttons and containers.

Understanding the Problem

As a newcomer to Flutter, you might be experimenting with various widget layouts and trying to implement button actions. A common question that arises is, how can you extract and display the text contained in a specific widget? For example, you may have a button whose text you want to print when the button is pressed.

Here's a brief overview of the widgets in question:

Button Widget: A clickable widget that performs an action when pressed.

Text Widget: Displays a string of text.

In the provided code snippet, your goal is to print the text from:

A RaisedButton with the label "Button One".

A Text widget contained in a Container, displaying "Container One".

Solution Overview

In Flutter, retrieving text from widgets can be achieved through type casting and accessing widget properties. Let's break this down step by step.

Step 1: Understanding Widget Structure

Your widget structure includes:

A RaisedButton which houses a Text widget.

A Text widget which is directly defined in a Container.

Step 2: Using Type Casting

Flutter does not provide a direct getText() method like Java. Instead, you will need to cast the widgets to access their properties. Specifically:

For the Text widget, you can access its text content using the .data property.

For the RaisedButton, you'll need to cast it to access its child widget, which is a Text widget.

Step 3: Implementing the Solution

Use the below code snippet inside your onPressed function to access and print the desired texts:

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

Complete Flutter Example

For clarity, here’s the complete implementation of your app with the above logic:

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

Output

When you press "Button Two", the console will display:

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

Conclusion

Retrieving text from widgets in Flutter involves understanding the widget tree and utilizing type casting. With this guide, you should now feel more confident interacting with widgets in your Flutter applications. Keep experimenting and you'll soon master Flutter!