需要语音播报，对于语音播报依赖较高，希望提供示例

import { textToSpeech } from '@kit.CoreSpeechKit'; 
import { BusinessError } from '@kit.BasicServicesKit'; 
 
let ttsEngine: textToSpeech.TextToSpeechEngine; 
@Entry 
@Component 
struct SpeechDemo { 
  @State createCount: number = 0; 
  @State result: boolean = false; 
  @State voiceInfo: string = ""; 
  @State text: string = ""; 
  @State textContent: string = ""; 
  @State utteranceId: string = "123456"; 
  @State originalText: string = "\n\t\t古人学问无遗力，少壮工夫老始成；\n\t\t" + 
    "纸上得来终觉浅，绝知此事要躬行。\n\t\t"; 
  @State illegalText: string = ""; 
 
  aboutToAppear(): void { 
    this.createByCallback(); 
  } 
 
  build() { 
    Column() { 
      Scroll() { 
        Column() { 
          TextArea({ placeholder: 'Please enter tts original text', text: `${this.originalText}` }) 
            .margin(20) 
            .focusable(false) 
            .border({ width: 5, color: 0x317AE7, radius: 10, style: BorderStyle.Dotted }) 
            .onChange((value: string) => { 
              this.originalText = value; 
              console.info("original text: " + this.originalText); 
            }) 
          Button() { 
            Text("speak") 
              .fontColor(Color.White) 
              .fontSize(20) 
          } 
          .type(ButtonType.Capsule) 
          .backgroundColor("#0x317AE7") 
          .width("80%") 
          .height(50) 
          .margin(10) 
          .onClick(() => { 
            this.createCount++; 
            console.info(`CreateTtsEngine：createCount:${this.createCount}`) 
            this.speak(); 
          }) 
 
          Button() { 
            Text("listVoicesCallback") 
              .fontColor(Color.White) 
              .fontSize(20) 
          } 
          .type(ButtonType.Capsule) 
          .backgroundColor("#0x317AE7") 
          .width("80%") 
          .height(50) 
          .margin(10) 
          .onClick(() => { 
            this.listVoicesCallback(); 
          }) 
 
          Button() { 
            Text("stop") 
              .fontColor(Color.White) 
              .fontSize(20) 
          } 
          .type(ButtonType.Capsule) 
          .backgroundColor("#0x317AE7") 
          .width("80%") 
          .height(50) 
          .margin(10) 
          .onClick(() => { 
            // 停止播报 
            console.info("isSpeaking click:-->"); 
            ttsEngine.stop(); 
          }) 
 
          Button() { 
            Text("isBusy") 
              .fontColor(Color.White) 
              .fontSize(20) 
          } 
          .type(ButtonType.Capsule) 
          .backgroundColor("#0x317AE7") 
          .width("80%") 
          .height(50) 
          .margin(10) 
          .onClick(() => { 
            console.info("isSpeaking click:-->"); 
            // 查询播报状态 
            let isBusy = ttsEngine.isBusy(); 
            console.info('isBusy :' + isBusy); 
          }) 
 
          Button() { 
            Text("shutdown") 
              .fontColor(Color.White) 
              .fontSize(20) 
          } 
          .type(ButtonType.Capsule) 
          .backgroundColor("#0x317AA7") 
          .width("80%") 
          .height(50) 
          .margin(10) 
          .onClick(() => { 
            // 释放引擎 
            ttsEngine.shutdown(); 
          }) 
        } 
        .layoutWeight(1) 
      } 
      .width('100%') 
      .height('100%') 
    } 
  } 
 
  // 创建引擎，通过callback形式返回 
  // 当引擎不存在、引擎资源不存在、初始化超时，返回错误码1003400005，引擎创建失败 
  private createByCallback() { 
    // 设置创建引擎参数 
    let extraParam: Record<string, Object> = {"style": 'interaction-broadcast', "locate": 'CN', "name": 'EngineName'}; 
    let initParamsInfo: textToSpeech.CreateEngineParams = { 
      language: 'zh-CN', 
      person: 0, 
      online: 1, 
      extraParams: extraParam 
    }; 
    try { 
      // 调用createEngine方法 
      textToSpeech.createEngine(initParamsInfo, (err: BusinessError, textToSpeechEngine: textToSpeech.TextToSpeechEngine) => { 
        if (!err) { 
          console.info('createEngine is succeeded'); 
          // 接收创建引擎的实例 
          ttsEngine = textToSpeechEngine; 
        } else { 
          // 创建引擎失败时返回错误码1003400005，可能原因：引擎不存在、资源不存在、创建引擎超时 
          console.error("errCode is " + err.code); 
          console.error("errMessage is " + err.message); 
        } 
      }); 
    } catch (error) { 
      let message = (error as BusinessError).message; 
      let code = (error as BusinessError).code; 
      console.error(`createEngine failed, error code: ${code}, message: ${message}.`) 
    } 
  }; 
 
  // 调用speak播报方法 
  // 未初始化引擎时调用speak方法，返回错误码1003400007，合成或播报失败 
  private speak() { 
    let speakListener: textToSpeech.SpeakListener = { 
      // 开始合成或播报回调 
      onStart(requestId: string, response: textToSpeech.StartResponse) { 
        console.info('onStart: ' + 'requestId: ' + requestId + ' response: ' + JSON.stringify(response)); 
      }, 
      // 完成合成或播报回调 
      onComplete(requestId: string, response: textToSpeech.CompleteResponse) { 
        console.info('onComplete: ' + 'requestId: ' + requestId + ' response: ' + JSON.stringify(response)); 
      }, 
      // 停止合成或播报回调，调用stop方法并完成时会触发此回调 
      onStop(requestId: string, response: textToSpeech.StopResponse) { 
        console.info('onStop: ' + 'requestId: ' + requestId + ' response: ' + JSON.stringify(response)); 
      }, 
      // 返回音频流 
      onData(requestId: string, audio: ArrayBuffer, response: textToSpeech.SynthesisResponse) { 
        console.info('speakListener onData: ' + ' requestId: ' + requestId + ' sequence: ' + JSON.stringify(response) + ' audio: ' +   audio); 
      }, 
      // 错误回调，播报过程发生错误时触发此回调 
      // 未创建引擎时调用speak方法时返回错误码1003400007，合成或播报失败 
      // 连续调用两次speak，第二次speak会返回错误码1003400006，服务正忙碌 
      onError(requestId: string, errorCode: number, errorMessage: string) { 
        console.error('OnError: ' + 'requestId: ' + requestId + ' errorCode: ' + errorCode + 'errorMessage: ' + errorMessage); 
      } 
    }; 
    // 设置回调 
    ttsEngine.setListener(speakListener); 
    // 设置播报相关参数 
    let extraParam: Record<string, Object> = {"queueMode": 0, "speed": 1, "volume": 2, "pitch": 1, "languageContext": 'zh-CN', "audioType": "pcm", "soundChannel": 3, "playType":1} 
    let speakParams: textToSpeech.SpeakParams = { 
      requestId: '123456-a', // requestId在同一实例内仅能用一次，请勿重复设置 
      extraParams: extraParam 
    }; 
    // 调用speak播报方法 
    ttsEngine.speak(this.originalText, speakParams); 
  }; 
 
  // 查询语种音色信息，以callback形式返回 
  private listVoicesCallback() { 
    // 设置查询相关参数 
    let voicesQuery: textToSpeech.VoiceQuery = { 
      requestId: '123456-b', // requestId在同一实例内仅能用一次，请勿重复设置 
      online: 1 
    }; 
 
    // 调用listVoices方法，以callback返回语种音色查询结果 
    ttsEngine.listVoices(voicesQuery, (err: BusinessError, voiceInfo: textToSpeech.VoiceInfo[]) => { 
      if (!err) { 
        // 接收目前支持的语种音色等信息 
        console.info('voiceInfo is succeeded ' + voiceInfo); 
      } else { 
        console.error("errCode is " + err.code); 
        console.error("errMessage is " + err.message); 
      } 
    }); 
  }; 
}