在 entry/src/main/module.json5 中增加 requestPermissions：

JSON"requestPermissions": [
  {
    "name": "ohos.permission.INTERNET" // 网络权限
  },
  {
    "name": "ohos.permission.MICROPHONE" // 麦克风权限
  },
  {
    "name": "ohos.permission.CAMERA" // 相机权限
  }
]

TypeScriptimport common from '@ohos.app.ability.common';
import { NERtcVideoView , NERtcSDK, NERtcConstants, NERtcCallbackEx} from '@nertc/nertc_sdk';
import prompt from '@ohos.promptAction';
import AbilityAccessCtrl from '@ohos.abilityAccessCtrl';
class User {
  uid: bigint = BigInt(0);
  width?: number = 150;
  height?: number = 150;
  local?: boolean = false; // Is yourself?
}

interface LoginInfo {
  cname: string;
  uid: string;
}
interface Delegate {
  onUserJoin?:(uid: bigint) => void
  onUserLeave?:(uid: bigint, reason: number) => void
}
@Entry
@Component
struct Index {
  @State message: string = 'Hello World';
  TAG: string = "VideoCall"
  context = getContext(this) as common.UIAbilityContext;
  login: LoginInfo = {
    cname: "1392",
    uid: Math.floor(Math.random() * 10000).toString()
  };
  joinFlag: boolean = false
  @State local?: User = undefined
  @State remote?: User = undefined
  delegate: Delegate ={
    onUserJoin:(uid: bigint): void => {
      console.info(this.TAG, `User: ${uid} joined.`)
      if(this.remote == undefined) {
        this.remote = { uid: uid }
        console.info(this.TAG, 'Create Remote User.')
      }
    },

    onUserLeave:(uid: bigint, reason: number): void => {
      console.info(this.TAG, `User: ${uid} leave.`)
      if(this.remote && this.remote.uid === uid) {
        this.remote = undefined
      }
    }
  }
  onPageShow() {
    console.info(this.TAG, '=== CallPage show ===')
    this.RequestPermission()
  }

  build() {
    Row() {
      Column() {
        Text("单击屏幕加入房间")
        Flex({ direction: FlexDirection.Column }) {
          Stack({ alignContent: Alignment.BottomStart }) {
            Stack({ alignContent: Alignment.TopEnd }){

              if(this.remote) {
                NERtcVideoView ({
                  sCanvasId: String(this.remote.uid),
                  onLoad: (() => {
                    if(this.remote) {
                      console.info(this.TAG, `User: ${String(this.remote?.uid)} surface create.`)
                      this.attach(this.remote)
                    }
                  }),
                  onDestroy: (() => {
                    if(this.remote) {
                      console.info(this.TAG, `User: ${String(this.remote?.uid)} surface release.`)
                    }
                  })
                }).width('100%').height('100%')
              }

              if(this.local) {
                NERtcVideoView({
                  sCanvasId: String(this.local.uid),
                  onLoad: (() => {
                    console.info(this.TAG, `User: ${this.local?.uid} surface create.`)
                    if(this.local) this.attach(this.local)
                  }),
                  onDestroy: (() => {
                    console.info(this.TAG, `User: ${this.local?.uid} surface release.`)
                  })
                }).width(this.remote ? 200 : '100%').height(this.remote ? 200 : '100%')
              }

            }.width('100%').height('100%')
          }.width('100%').height('100%')
        }.onClick(() => {
          if(!this.joinFlag) {
            //单击屏幕入会
            let option: NERtcConstants.NERtcOption = { logLevel: NERtcConstants.LogLevel.INFO }
            NERtcSDK.getInstance().init(getContext(), "your-app-key", new ChatCallback(this.delegate), option)
            NERtcSDK.getInstance().enableLocalVideo(true, NERtcConstants.NERtcVideoStreamType.kNERtcVideoStreamTypeMain)
            NERtcSDK.getInstance().joinChannel('', this.login.cname, BigInt(this.login.uid))
            this.local = { uid: BigInt(this.login.uid ?? 0) }
            this.joinFlag = !this.joinFlag
          }else{
            NERtcSDK.getInstance().leaveChannel()
            NERtcSDK.getInstance().release()
            this.joinFlag = !this.joinFlag
          }
        })
      }
      .width('100%')
    }
    .height('100%')
  }

  attach(user: User) {

    let canvas: NERtcConstants.NERtcVideoCanvas = { canvasId: String(user.uid) }
    let local = String(user.uid) === this.login?.uid
    console.info(this.TAG, ' local' + user.uid + 'local2' + this.login?.uid)
    if(local) {
      let ret = NERtcSDK.getInstance().setupLocalVideoCanvas(canvas)
      console.info(this.TAG, 'setLocalVideoCanvas ret:' + ret)
    } else {
      let ret = NERtcSDK.getInstance().setupRemoteVideoCanvas(canvas, user.uid)
      console.info(this.TAG, 'setupRemoteVideoCanvas ret:' + ret)
      NERtcSDK.getInstance().subscribeRemoteVideo(user.uid, true, NERtcConstants.NERtcVideoStreamType.kNERtcVideoStreamTypeMain, NERtcConstants.NERtcRemoteVideoSubscribeType.kNERtcRemoteVideoSubscribeTypeHigh)
    }
  }

  async RequestPermission() {
    let atManager = AbilityAccessCtrl.createAtManager();
    let context = getContext(this);
    try {
      atManager.requestPermissionsFromUser(
        context,
        ["ohos.permission.CAMERA","ohos.permission.MICROPHONE"],
        (err, data) =>
        {
          if(err) {
            prompt.showToast({message: ` 请求权限失败: ${err}`})
            return
          }
          let micGrant: boolean = data.authResults[1] === AbilityAccessCtrl.GrantStatus.PERMISSION_GRANTED;
          let cameraGrant: boolean = data.authResults[0] === AbilityAccessCtrl.GrantStatus.PERMISSION_GRANTED;

          if(!micGrant) {
            prompt.showToast({ message: "麦克风权限未授予" })
          }
          if(!cameraGrant) {
            prompt.showToast({message: "摄像头权限未授予" })
          }
        })
    } catch(err) {
      prompt.showToast({ message: `请求权限失败: ${JSON.stringify(err)}`})
    }
  }
}
class ChatCallback extends NERtcCallbackEx {
  delegate: Delegate
  constructor(delegate: Delegate) {
    super()
    this.delegate = delegate;
  }
  onJoinChannel(result: number, channelId: bigint, elapsed: bigint, uid: bigint): void {
    prompt.showToast({ message: 'Join channel async result:' + result, duration: 2000 })
  }

  onLeaveChannel(result: number): void {

  }

  onUserJoined(uid: bigint, extraInfo?: NERtcConstants.NERtcUserJoinExtraInfo): void {
    if(this.delegate) {
      if (!this.delegate.onUserJoin) throw new Error("onUserJoin not find");
      this.delegate?.onUserJoin(uid)
    }
  }

  onUserLeave(uid: bigint, reason: number, extraInfo?: NERtcConstants.NERtcUserLeaveExtraInfo): void {
    if(this.delegate) {
      if (!this.delegate.onUserLeave) throw new Error("onUserJoin not find");
      this.delegate?.onUserLeave(uid, reason)
    }
  }

  onUserAudioStart(uid: bigint): void {

  }

  onUserAudioStop(uid: bigint): void {

  }

  onUserVideoStart(uid: bigint, maxProfile: number): void {

  }

  onUserVideoStop(uid: bigint): void {

  }
  onLastmileQuality(quality: number):void {

  }
  onLastmileProbeResult(result: NERtcConstants.LiteSDKProbeResult):void {

  }
  onDisconnect(reason: number): void {

  }

  onClientRoleChange(oldRole: number, newRole: number): void {

  }

  onRecvSEIMsg(userId: bigint, data: Uint8Array, dataSize: number): void {

  }
}

实现基础的音视频通话，建议您参考 示例代码 完成界面创建。

TypeScript//对方开启视频，按需设置画布及订阅视频

let ret = NERtcSDK.getInstance().setupRemoteVideoCanvas(canvas, user.uid)
console.info(this.TAG, 'setupRemoteVideoCanvas ret:' + ret)
NERtcSDK.getInstance().subscribeRemoteVideo(user.uid, true, NERtcConstants.NERtcVideoStreamType.kNERtcVideoStreamTypeMain, NERtcConstants.NERtcRemoteVideoSubscribeType.kNERtcRemoteVideoSubscribeTypeHigh)