Flutter背景移除插件remove_bg的使用

在Flutter项目中，我们可以使用remove_bg插件来轻松地从图片中移除背景。这个插件依赖于Remove.bg的服务，因此需要一个有效的API密钥。

使用方法

首先，在你的Flutter应用中导入remove_bg包，并确保你已经获取了一个私钥（API Key）。然后，你可以通过选择图片并上传到Remove.bg服务来获得处理后的图片。

示例代码

以下是一个完整的示例demo，展示了如何使用remove_bg插件：

import 'dart:io';
import 'package:file_picker/file_picker.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:remove_bg/remove_bg.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});
  
  [@override](/user/override)
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  double linearProgress = 0.0;
  File? file;
  String? fileName;
  Uint8List? bytes;

  // 选择图片
  Future pickImage() async {
    try {
      FilePickerResult? result =
          await FilePicker.platform.pickFiles(type: FileType.image);
      if (result == null) return;
      setState(() {
        fileName = result.files.first.name;
        file = File(result.files.single.path!);
      });
    } on PlatformException catch (e) {
      debugPrint(e.toString());
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Remove.bg"),
      ),
      body: SingleChildScrollView(
        child: Center(
          child: Padding(
            padding: const EdgeInsets.all(14.0),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                if (bytes != null) Image.memory(bytes!),
                if (file != null)
                  SizedBox(
                    height: 240,
                    child: Row(
                      children: [
                        Expanded(
                          child: Column(
                            children: [
                              Card(
                                child: Image.file(
                                  file!,
                                  height: 200,
                                  width: double.infinity,
                                ),
                              ),
                              Text("FileName: $fileName"),
                            ],
                          ),
                        ),
                      ],
                    ),
                  ),
                const SizedBox(height: 10),
                LinearProgressIndicator(value: linearProgress),
                const SizedBox(height: 10),
                const Text('Remove.bg Upload Progress'),
                const SizedBox(height: 10),
                ElevatedButton(
                  onPressed: () {
                    pickImage();
                  },
                  child: const Text("Select Image"),
                )
              ],
            ),
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          if (file != null) {
            Remove().bg(
              file!,
              privateKey: "your_private_key_here", // 替换为你的私钥
              onUploadProgressCallback: (progressValue) {
                if (kDebugMode) {
                  print(progressValue);
                }
                setState(() {
                  linearProgress = progressValue;
                });
              },
            ).then((data) async {
              if (kDebugMode) {
                print(data);
              }
              bytes = data;
              setState(() {});
            });
          }
        },
        tooltip: 'Submit',
        child: const Icon(Icons.add),
      ),
    );
  }
}