Flutter数据压缩插件zstandard_platform_interface的使用

Flutter数据压缩插件zstandard_platform_interface的使用

zstandard_platform_interface 是一个用于 zstandard 插件的通用平台接口。该接口允许平台特定的实现与插件本身保持一致的接口。

使用

要实现一个新的平台特定的 zstandard 实现，需要扩展 ZstandardPlatform 类，并在注册插件时设置默认的 ZstandardPlatform，例如：

ZstandardPlatform.instance = MyPlatformZstandard();

以下是一个完整的示例，展示了如何使用 zstandard_platform_interface 进行数据压缩和解压缩操作。

示例代码

首先，确保你已经在 pubspec.yaml 文件中添加了 zstandard 和 zstandard_platform_interface 依赖：

dependencies:
  zstandard: ^0.1.0
  zstandard_platform_interface: ^0.1.0

然后，在你的 Dart 文件中导入必要的包：

import 'package:flutter/material.dart';
import 'package:zstandard/zstandard.dart';
import 'package:zstandard_platform_interface/zstandard_platform_interface.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('zstandard 压缩示例'),
        ),
        body: Center(
          child: CompressDecompressWidget(),
        ),
      ),
    );
  }
}

class CompressDecompressWidget extends StatefulWidget {
  @override
  _CompressDecompressWidgetState createState() => _CompressDecompressWidgetState();
}

class _CompressDecompressWidgetState extends State<CompressDecompressWidget> {
  String _originalData = 'Hello, Flutter!';
  String _compressedData = '';
  String _decompressedData = '';

  Future<void> _compressData() async {
    final compressor = Zstandard();
    final compressedBytes = await compressor.compress(Uint8List.fromList(utf8.encode(_originalData)));
    setState(() {
      _compressedData = base64Encode(compressedBytes);
    });
  }

  Future<void> _decompressData() async {
    final decompressor = Zstandard();
    final decompressedBytes = await decompressor.decompress(base64Decode(_compressedData));
    setState(() {
      _decompressedData = utf8.decode(decompressedBytes);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        ElevatedButton(
          onPressed: _compressData,
          child: Text('压缩数据'),
        ),
        SizedBox(height: 20),
        Text('原始数据: $_originalData'),
        SizedBox(height: 20),
        Text('压缩后的数据: $_compressedData'),
        SizedBox(height: 20),
        ElevatedButton(
          onPressed: _decompressData,
          child: Text('解压缩数据'),
        ),
        SizedBox(height: 20),
        Text('解压缩后的数据: $_decompressedData'),
      ],
    );
  }
}

代码解释

1. 导入必要的库：

   import 'package:flutter/material.dart';
   import 'package:zstandard/zstandard.dart';
   import 'package:zstandard_platform_interface/zstandard_platform_interface.dart';
   

2. 定义主应用类：

   void main() {
     runApp(MyApp());
   }
   
   class MyApp extends StatelessWidget {
     @override
     Widget build(BuildContext context) {
       return MaterialApp(
         home: Scaffold(
           appBar: AppBar(
             title: Text('zstandard 压缩示例'),
           ),
           body: Center(
             child: CompressDecompressWidget(),
           ),
         ),
       );
     }
   }
   

3. 定义压缩和解压缩组件：

   class CompressDecompressWidget extends StatefulWidget {
     @override
     _CompressDecompressWidgetState createState() => _CompressDecompressWidgetState();
   }
   
   class _CompressDecompressWidgetState extends State<CompressDecompressWidget> {
     String _originalData = 'Hello, Flutter!';
     String _compressedData = '';
     String _decompressedData = '';
   
     Future<void> _compressData() async {
       final compressor = Zstandard();
       final compressedBytes = await compressor.compress(Uint8List.fromList(utf8.encode(_originalData)));
       setState(() {
         _compressedData = base64Encode(compressedBytes);
       });
     }
   
     Future<void> _decompressData() async {
       final decompressor = Zstandard();
       final decompressedBytes = await decompressor.decompress(base64Decode(_compressedData));
       setState(() {
         _decompressedData = utf8.decode(decompressedBytes);
       });
     }
   
     @override
     Widget build(BuildContext context) {
       return Column(
         mainAxisAlignment: MainAxisAlignment.center,
         children: [
           ElevatedButton(
             onPressed: _compressData,
             child: Text('压缩数据'),
           ),
           SizedBox(height: 20),
           Text('原始数据: $_originalData'),
           SizedBox(height: 20),
           Text('压缩后的数据: $_compressedData'),
           SizedBox(height: 20),
           ElevatedButton(
             onPressed: _decompressData,
             child: Text('解压缩数据'),
           ),
           SizedBox(height: 20),
           Text('解压缩后的数据: $_decompressedData'),
         ],
       );
     }
   }