Flutter-Native SDK集成实现百度语音识别功能

Android Native SDK集成流程

下载百度语音识别Android SDK
使用Android Studio打开Android项目,OpenFile - Android项目
创建语音Library(File-new Module-Library(asr_plugin)
添加sdk(解压下载的SDK/core/libs/***.jar)拷贝到asr_plugin/libs下
配置so库文件(解压下载的SDK/core/src/main/jniLibs)将jniLibs整个文件夹拷贝到项目同等位置,删除下面的armeabi,armeabi-v7a(因为Flutter没有armeabi,armeabi-v7a架构的so),删除使用不到的库文件,保留图中文件

image

在AndroidManifest中声明权限
```
    
    
    
    
    
```
在控制台创建应用获取AppId并配置到AndroidManifest
```
 
    
    
    
  
```
设置service,同样在AndroidManifest中配置
在app build.gradle中dependencies中添加依赖
```
implementation project(':asr_plugin')
```
注:报错Error:Program type already present: android.support.v4.os.ResultReceiver

解决:在gradle.properties中添加
```
android.useAndroidX=true
android.enableJetifier=true
```

iOS Native SDK集成流程

下载iOS SDK
打包iOS工程,Mac下双击工程目录下Runner.xcworkspace文件即可
Runner上右键new Group命名为plugin
将下载的SDK中BDSClientLib文件夹拖到plugin下,勾选Copy items if needed和Create groups,删除BDSClientLib下的.gitignore
拖动BDSClientResource/ASR/BDSClientResources到plugin下,勾选Copy items if needed和Create folder references
拖动BDSClientResource/ASR/BDSClientEASRResources到plugin下,勾选Copy items if needed和Create folder references
添加framework,点击如图'+'号,添加以下需要的framework

image

CoreTelephony.framework

libsqlite3.0.tbd

libiconv.2.4.0.tbd

libc++.tbd

libs.1.2.5.tbd
添加语音权限Privacy - Microphone Usage Description

image

Flutter Plugin开发指南 - Dart端实现

在lib下创建plugin/asr_manager.dart编写Dart端代码,用于传递信息到Native端实现相应功能

import 'package:flutter/services.dart';

class AsrManager {
  static const MethodChannel _channel = const MethodChannel('asr_plugin');

  /**
   * 开始录音
   */
  static Future start({Map params}) async {
    return await _channel.invokeMethod('start', params ?? {});
  }

  /**
   * 停止录音
   */
  static Future stop() async {
    return await _channel.invokeMethod('stop');
  }

  /**
   * 取消录音
   */
  static Future cancel() async {
    return await _channel.invokeMethod('cancel');
  }
}

Flutter Plugin开发指南 - Android端实现

为Android Model添加Flutter依赖,在model中build.gradle添加如下代码

apply plugin: 'com.android.library'

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

flutter {
    source '../..'
}

解决model和app都依赖Flutter冲突问题

app/build.gradle中defaultConfig下添加ndk选择代码

        ndk{
            abiFilters "arm64-v7a","arm64-v8a","x86_64","x86"
        }

app/build.gradle中android下添加下面代码

    packagingOptions {
        // 确保app与asr_plugin都依赖的libflutter.so merge时不冲突@https://github.com/card-io/card.io-Android-SDK/issues/186#issuecomment-427552552
        pickFirst 'lib/x86_64/libflutter.so'
        pickFirst 'lib/x86/libflutter.so'
        pickFirst 'lib/arm64-v8a/libflutter.so'
    }

实现Android端语音识别功能(略)

Android端创建AsrPlugin实现接收Dart的消息

    @Override
    public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) {
        initPermission();
        switch (methodCall.method) {
            case "start":
                resultStateful = ResultStateful.of(result);
                start(methodCall, resultStateful);
                break;
            case "stop":
                stop(methodCall,result);
                break;
            case "cancel":
                cancel(methodCall,result);
                break;
            default:
                result.notImplemented();
        }
    }

注册插件到MainActivity

AsrPlugin.registerWith(registrarFor("com.yangdxg.asr_plugin.asr.AsrPlugin"));

Flutter Plugin开发指南 - iOS端实现

在plugin下创建文件夹ASRPlugin,拖到工程plugin下,将导入的SDK等资源文件拖到ASRPlugin下,删除SDK等三个资源文件(选择Remove References)只删除路径再从新导入

image
在plugin下右键创建Object-C文件取名AsrManager,FileType选择Category,class选择NSObject,创建成功后更改.h和.m文件名为AsrManager
iOS端实现语音识别略(参考百度API文档)

iOS接收Dart消息

+ (void)registerWithRegistrar:(NSObject  *)registrar {
    FlutterMethodChannel *channel = [FlutterMethodChannel methodChannelWithName:@"asr_plugin" binaryMessenger:[registrar messenger] ];
    AsrPlugin* instance =[AsrPlugin new];
    [registrar addMethodCallDelegate:instance channel:channel];
}
- (void)handleMethodCall:(FlutterMethodCall *)call result:(FlutterResult)result {
    if ([@"start" isEqualToString:call.method]) {
        self.result = result;
        [[self _asrManager] start];
    }else if ([@"stop" isEqualToString:call.method]) {
         [[self _asrManager] stop];
    }else if ([@"cancel" isEqualToString:call.method]) {
        [[self _asrManager] cancel];
    } else{
        result(FlutterMethodNotImplemented);
    }
}
- (AsrManager*)_asrManager{
    if (!self.asrManager) {
        self.asrManager = [AsrManager initWith:^(NSString *message) {
            if (self.result) {
                self.result(message);
                self.result = nil;
            }
        } failure:^(NSString *message) {
            if (self.result) {
                self.result([FlutterError errorWithCode:@"ASR fail" message:message details:nil]);
                self.result = nil;
            }
        }];
    }
    return self.asrManager;
}

注册Dart消息接收

- (BOOL)application:(UIApplication *)application
    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  [GeneratedPluginRegistrant registerWithRegistry:self];
    //注册自有的插件
    [AsrPlugin registerWithRegistrar:[self registrarForPlugin:@"AsrPlugain"]];
  // Override point for customization after application launch.
  return [super application:application didFinishLaunchingWithOptions:launchOptions];
}

Flutter AI智能语音功能实现

界面开发略

实现点击方法调用AsrManager对应的调用Native的方法

  _speakStart() {
    controller.forward();
    setState(() {
      speakTips = '-- 识别中 --';
    });

    AsrManager.start().then((text) {
      print(text);
      if (text != null && text.length > 0) {
        setState(() {
          speakResult = text;
        });
        //选关闭再跳转
        Navigator.pop(context);
        Navigator.push(context, MaterialPageRoute(
            builder: (context) => SearchPage(keyword: speakResult,)));
      }
    }).catchError((e) {
      print('识别出错---' + e);
    });
  }

  _speakStop() {
    setState(() {
      speakTips = '长按说话';
    });
    controller.reset();
    controller.stop();
    AsrManager.stop();
  }

  _speakCancle() {
    AsrManager.cancel();
  }

Demo下载