1 Get API key

截屏2024-04-01 12.15.05.png

2 动态设置APPkey

{
  // 使用 IntelliSense 了解相关属性。 
  // 悬停以查看现有属性的描述。
  // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
      {
          "name": "flutter_application_gemini",
          "cwd": "flutter_application_gemini",
          "request": "launch",
          "type": "dart",
          "args": ["--dart-define=API_KEY=你的appkey"]
      },
      {
          "name": "flutter_application_gemini (profile mode)",
          "cwd": "flutter_application_gemini",
          "request": "launch",
          "type": "dart",
          "flutterMode": "profile"
      },
      {
          "name": "flutter_application_gemini (release mode)",
          "cwd": "flutter_application_gemini",
          "request": "launch",
          "type": "dart",
          "flutterMode": "release"
      }
  ]
}

3 获取Gemmi Flutter SDK

 google_generative_ai: ^0.2.2

4 识别文字较慢

 /// ai 内容
  String _content = "";

  /// 生成文字内容
  Future<String?> _doContentGeneration(String value) async {
    // 生成模型
    final model = GenerativeModel(
      // 模型名称
      model: 'gemini-pro',
      // API 密钥
      apiKey: MyApp.apiKey,
      // 根据可能的有害性调整您看到回复的可能性。基于内容有害性的概率进行屏蔽。
      safetySettings: [
        SafetySetting(HarmCategory.harassment, HarmBlockThreshold.medium), // 骚扰
        SafetySetting(
            HarmCategory.hateSpeech, HarmBlockThreshold.medium), // 仇恨言论
        SafetySetting(
            HarmCategory.sexuallyExplicit, HarmBlockThreshold.medium), // x暗示
        SafetySetting(
            HarmCategory.dangerousContent, HarmBlockThreshold.medium), // 危险内容
      ],
    );

    // 提问词列表
    final content = [
      Content.text(value),
    ];

    // 请求返回
    final response = await model.generateContent(content);
    return response.text;
  }

5 识别文字 较快

/// ai 内容
  String _content = "";

  /// 生成文字内容
  Future<void> _doContentStream(String value) async {
    // 生成模型
    final model = GenerativeModel(
      // 模型名称
      model: 'gemini-pro',
      // API 密钥
      apiKey: MyApp.apiKey,
      // 根据可能的有害性调整您看到回复的可能性。基于内容有害性的概率进行屏蔽。
      safetySettings: [
        SafetySetting(HarmCategory.harassment, HarmBlockThreshold.medium), // 骚扰
        SafetySetting(
            HarmCategory.hateSpeech, HarmBlockThreshold.medium), // 仇恨言论
        SafetySetting(
            HarmCategory.sexuallyExplicit, HarmBlockThreshold.medium), // x暗示
        SafetySetting(
            HarmCategory.dangerousContent, HarmBlockThreshold.medium), // 危险内容
      ],
    );

    // 提问词列表
    final content = [
      Content.text(value),
    ];

    // 清空
    setState(() {
      _content = "";
    });
    // 流失接收
    model.generateContentStream(content).listen((event) {
      setState(() {
        _content += event.text ?? "";
      });
    });
  }

6 识别图片

 /// 图片识别
  Future<String?> _doVisionGeneration(String value) async {
    // 生成模型
    final model = GenerativeModel(
      // 模型名称
      model: 'gemini-pro-vision',
      // API 密钥
      apiKey: MyApp.apiKey,
      // 根据可能的有害性调整您看到回复的可能性。基于内容有害性的概率进行屏蔽。
      safetySettings: [
        SafetySetting(HarmCategory.harassment, HarmBlockThreshold.medium), // 骚扰
        SafetySetting(
            HarmCategory.hateSpeech, HarmBlockThreshold.medium), // 仇恨言论
        SafetySetting(
            HarmCategory.sexuallyExplicit, HarmBlockThreshold.medium), // x暗示
        SafetySetting(
            HarmCategory.dangerousContent, HarmBlockThreshold.medium), // 危险内容
      ],
    );

    // 提问词列表
    final (firstImage, secondImage) = await (
      loadImage('assets/images/1.jpg'),
      loadImage('assets/images/2.jpg'),
      // File('assets/images/1.jpg').readAsBytes(),
      // File('assets/images/1.jpg').readAsBytes()
    ).wait;
    final prompt = TextPart(value);
    final imageParts = [
      DataPart('image/jpeg', firstImage),
      DataPart('image/jpeg', secondImage),
    ];
    final response = await model.generateContent([
      Content.multi([prompt, ...imageParts])
    ]);

    // 请求返回
    return response.text;
  }

参考：
https://ai.google.dev/tutorials/quickstart?hl=zh-cn
https://ai.google.dev/models/gemini?hl=zh-cn
https://github.com/ducafecat/flutter_develop_tips