Flutter开发的高效图片压缩工具：让APP更加丝滑

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我正在参加「掘金·启航计划」

简介

随着互联网时代的到来，图片作为一种重要的信息载体，已经渗透到了我们生活的方方面面。在开发移动应用时，经常需要对图片进行压缩，以减小图片的大小，从而减少应用程序对用户手机存储空间的占用和对网络带宽的占用。今天，我们将学习如何使用Flutter开发一款高效的图片压缩工具。

Flutter的基础知识介绍

Flutter是一种流行的跨平台移动应用开发框架，它可以同时支持Android和iOS两个平台。Flutter提供了丰富的UI组件，以及强大的开发工具和命令行接口。

Flutter新版本它增加了许多新特性和改进，包括：

• 更好的性能和稳定性
• 新的UI组件和动画效果
• 支持许多第三方库和代码包
• 优化了热重载和调试工具

开发步骤

在本节中，我们将学习如何使用Flutter开发图片压缩工具。整个开发过程分为以下几个步骤：

1. 引入相关依赖库
2. 编写图片压缩工具的主要功能
3. 编写界面以及交互逻辑
4. 优化和改进

1. 引入相关依赖库

在Flutter中，我们可以使用pubspec.yaml文件来管理我们的依赖库和代码包。在本例中，我们将使用两个依赖库来实现图片压缩功能。

第一个依赖库是image_picker，它可以让我们方便地从相册或相机中选择图片。

第二个依赖库是image，它是一个强大而灵活的图像处理库，支持多种格式的图像文件，并提供了通用的图像处理工具。

在pubspec.yaml文件中添加以下代码：

dependencies:
  flutter:
    sdk: flutter
  image_picker: ^0.8.7+4
  image: ^4.0.17

完成后，执行flutter packages get命令，等待依赖库下载完毕即可。

2. 编写图片压缩工具的主要功能

在本部分中，我们将编写图片压缩工具的主要功能，主要包括:

• 压缩图片尺寸
• 压缩图片质量
• 生成压缩后的图片文件。

2.1 压缩图片尺寸

图片压缩的第一个步骤是调整图片的尺寸。在Flutter中，我们可以使用image库中的Resize函数来完成这个步骤。

假设我们已经从相册选择了一张图片，我们可以将其转换成Image对象，并调整它的宽度和高度。

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:image/image.dart' as Img;

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Image Compressor',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Image Compressor'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  late File _imageFile;
  TextEditingController _widthController = TextEditingController();
  TextEditingController _heightController = TextEditingController();

  Future<void> _pickImage(ImageSource source) async {
    final pickedFile = await ImagePicker().pickImage(
        source: source,
        imageQuality: 100
    );
    setState(() {
        if (pickedFile != null) {
            _imageFile = File(pickedFile.path);
        } else {
            print(‘No image selected.’);
        }
    });
    }

    void _compressImage() async {
        if (_imageFile == null) {
            return;
        }
    int width = int.parse(_widthController.text);
    int height = int.parse(_heightController.text);

    Img.Image image = Img.decodeImage(await _imageFile.readAsBytes())!;
    Img.Image resizedImage = Img.copyResize(image, width: width, height: height);

    // 将调整大小的图像保存到临时文件
    String tempPath = (await getTemporaryDirectory()).path;
    File compressedImageFile = File('$tempPath/compressed_image.jpg');
    compressedImageFile.writeAsBytesSync(Img.encodeJpg(resizedImage));
}

在上面的代码中，我们使用了一个名为resizeImage的辅助函数，它将图片缩小到指定的宽度和高度，并将结果作为一个新的Image对象返回。

注意，我们将压缩后的图片文件保存到了临时目录中。这是因为我们不想在用户的手机中存储多余的文件。

2.2 压缩图片质量

图片压缩的第二个步骤是调整图片的质量。在Flutter中，我们可以使用image库中的encodeJpg函数来完成这个步骤。

我们可以将这个函数的第二个参数quality设置为0-100之间的整数，来控制压缩后的图片质量。通常情况下，压缩后的图片质量设置为60-80之间是比较合理的。

    Img.Image image = Img.decodeImage(await _imageFile.readAsBytes())!;
    int quality = 80;
    List<int> compressedImage = Img.encodeJpg(image, quality: quality);

2.3 生成压缩后的图片文件

最后一步是将压缩后的图片保存到文件中。在Flutter中，我们可以使用File类的writeAsBytesSync函数将字节数组写入文件。

    String tempPath = (await getTemporaryDirectory()).path;
    File compressedImageFile = File('$tempPath/compressed_image.jpg');
    compressedImageFile.writeAsBytesSync(compressedImage);

3. 实现UI交互逻辑

我们可以使用Flutter的Widget构建器来创建一个简单的UI界面。在我们的案例中，我们需要一个按钮来选择图片、两个文本框来输入图片的宽度和高度、一个按钮来触发压缩图片的操作，以及一个图片查看器来查看压缩后的图片。

首先，我们需要添加一个FlatButton按钮，当用户点击这个按钮时，它将调用_pickImage函数，以便用户可以从相册或相机中选择图片。

FlatButton(
  child: Text('Select Image'),
  onPressed: () {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text('Select Image Source'),
          actions: <Widget>[
            FlatButton(
              child: Text('Camera'),
              onPressed: () {
                Navigator.pop(context);
                _pickImage(ImageSource.camera);
              },
            ),
            FlatButton(
              child: Text('Gallery'),
              onPressed: () {
                Navigator.pop(context);
                _pickImage(ImageSource.gallery);
              },
            ),
          ],
        );
      },
    );
  },
),

接下来，我们需要添加两个文本框，让用户可以输入图片的宽度和高度。

TextField(
    controller: _widthController,
    keyboardType: TextInputType.number,
    decoration: InputDecoration(
        hintText: 'Enter Width',
    ),
),
TextField(
    controller: _heightController,
    keyboardType: TextInputType.number,
    decoration: InputDecoration(
        hintText: ‘Enter Height’,
    ),
),

我们还需要添加一个RaisedButton按钮，当用户点击这个按钮时，它将调用_compressImage函数，以便压缩图片。

RaisedButton(
  child: Text('Compress Image'),
  onPressed: () {
    _compressImage();
  },
),

最后，我们需要添加一个Image组件，当用户选择并压缩图片时，它将用于查看压缩后的图片。

Expanded(
  child: Container(
    padding: EdgeInsets.all(16.0),
    decoration: BoxDecoration(
      border: Border.all(
        color: Colors.blue,
      ),
    ),
    child: _imageFile == null
        ? Text('No image selected.')
        : Image.file(_imageFile),
  ),
),

4. 优化和改进

4.1 压缩算法优化

我们可以进一步优化我们的压缩算法，以减小压缩文件的大小。例如，我们可以使用更复杂的算法来压缩图片，例如JPEG2000或WebP。

4.2 UI界面美化

我们也可以改进我们的UI界面，使它更美观和易于使用。例如，我们可以添加进度条来显示压缩进度，或向用户提供更多的压缩选项。

4.3 对其他格式的文件压缩支持

我们可以扩展我们的工具，以支持其他格式的文件压缩。例如，我们可以使用PDF压缩库来压缩PDF文件，或使用ZIP压缩库来压缩多个文件。

4.4 代码结构改进

我们可以改善我们的代码结构，使得它更易于维护和扩展。例如，我们可以将压缩算法封装在单独的类中，或将UI界面封装在单独的组件中。

总结

在本文中，我们学习了如何使用Flutter开发一款高效的图片压缩工具。我们学习了如何使用image_picker和image库来实现图片压缩的主要功能，以及如何使用Flutter的Material Design风格来设计UI界面。我们还讨论了如何优化和改进我们的图片压缩工具，并给出了一些可行的方案。
掘友们，快去动手试试。