Working with Text and Images in Flutter

Working with Text and Images in Flutter

Introduction

Flutter is Google’s open-source UI toolkit for building beautiful, natively compiled applications for mobile, web, and desktop from a single codebase. Working with text and images is fundamental in almost every Flutter app. This guide covers how to effectively display, style, and manage text and images in Flutter applications.


1. Displaying Text

Flutter provides the Text widget to display strings with various styles.


Basic Example

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Text('Hello, Flutter!');

Styling Text

Use the style property with TextStyle:


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Text(

  'Styled Text',

  style: TextStyle(

    fontSize: 24,

    fontWeight: FontWeight.bold,

    color: Colors.blue,

    letterSpacing: 2,

  ),

);

Text Alignment and Overflow

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Text(

  'This is a long piece of text that might overflow.',

  textAlign: TextAlign.center,

  overflow: TextOverflow.ellipsis,

  maxLines: 1,

);

2. Working with Rich Text

Use RichText and TextSpan for multiple styles in one block of text.


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RichText(

  text: TextSpan(

    text: 'Flutter ',

    style: TextStyle(color: Colors.black, fontSize: 18),

    children: <TextSpan>[

      TextSpan(text: 'is ', style: TextStyle(fontWeight: FontWeight.normal)),

      TextSpan(text: 'awesome!', style: TextStyle(fontWeight: FontWeight.bold, color: Colors.blue)),

    ],

  ),

);

3. Displaying Images

Flutter provides the Image widget to display images from various sources.


From Assets

Add to pubspec.yaml:


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flutter:

  assets:

    - assets/images/sample.png

Use in code:


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Image.asset('assets/images/sample.png');

From Network

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Image.network('https://example.com/image.png');

From File (Local Storage)

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Image.file(File('path/to/image.png'));

From Memory (Uint8List)

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Image.memory(bytes);

4. Image Properties and Styling

Resize and Fit


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Image.asset(

  'assets/images/sample.png',

  width: 100,

  height: 100,

  fit: BoxFit.cover,

);

Add Border Radius


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ClipRRect(

  borderRadius: BorderRadius.circular(10),

  child: Image.asset('assets/images/sample.png'),

);

Use Placeholder with FadeInImage


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FadeInImage.assetNetwork(

  placeholder: 'assets/images/placeholder.png',

  image: 'https://example.com/image.png',

);

5. Combining Text and Images

Use Row, Column, or Stack to layout text and images together.


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Row(

  children: [

    Image.asset('assets/images/icon.png', width: 40),

    SizedBox(width: 10),

    Text('Image with text'),

  ],

);

6. Performance and Best Practices

Use const where possible for static text and images.


Use CachedNetworkImage package to cache images:


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dependencies:

  cached_network_image: ^3.2.3

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CachedNetworkImage(

  imageUrl: 'https://example.com/image.png',

  placeholder: (context, url) => CircularProgressIndicator(),

  errorWidget: (context, url, error) => Icon(Icons.error),

);

Optimize images for mobile use: compress assets, use WebP or JPEG.


Conclusion

Flutter makes it simple to work with both text and images using intuitive and flexible widgets. Mastering these basic elements is essential for creating beautiful, responsive, and performant Flutter apps.

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