【HarmonyOS】关于鸿蒙原生使用原生相机实现扫一扫功能

"requestPermissions": [  {    "name": 'ohos.permission.CAMERA',    "reason": "$string:permission_camera_reason",    "usedScene": {      "when": "inuse"    }  }]

/** * 请求权限 * @param type 权限类型 */static async requestSystemAuth(type: SystemAuthType): Promise<boolean> {  // 权限管理  let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager();  let context = getContext() as common.UIAbilityContext;
  let permissionArr: Permissions[] = ['ohos.permission.CAMERA']  let isGrant: boolean = false;  await atManager.requestPermissionsFromUser(context, permissionArr).then((data) => {    let grantStatus: number[] = data.authResults;    let length: number = grantStatus.length;    for (let i = 0; i < length; i++) {      if (grantStatus[i] === 0) {        // 用户授权        isGrant = true;      } else {        // 用户拒绝        isGrant = false;      }    }  }).catch((err: BusinessError) => {    console.error('HMSystemAuthManager', 'Failed to request permissions from user. Code is ' + err.code + ', message is ' + err.message)  })  return isGrant;}

/** * 检测是否申请权限 * @param permission 权限 * @returns true 权限状态 */static async checkPermission(permission: Permissions): Promise<abilityAccessCtrl.GrantStatus> {  let atManager = abilityAccessCtrl.createAtManager();  let grantStatus: abilityAccessCtrl.GrantStatus = abilityAccessCtrl.GrantStatus.PERMISSION_DENIED;
  // 获取应用accessTokenID  let tokenId: number = -10;  try {    let bundleInfo: bundleManager.BundleInfo = await bundleManager.getBundleInfoForSelf(bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION);    let appInfo: bundleManager.ApplicationInfo = bundleInfo.appInfo;    tokenId = appInfo.accessTokenId;  } catch (err) {    console.error('YTPermissionCheck', `getBundleInfoForSelf failed, code is ${err.code}, message is ${err.message}`);  }
  // 校验应用是否被授予权限  try {    grantStatus = await atManager.checkAccessToken(tokenId, permission);  } catch (err) {    console.error('PermissionCheck', `checkAccessToken failed, code is ${err.code}, message is ${err.message}`);  }
  return grantStatus;}

// 初始化相机initCamera() {  // 用户已授权，开始初始化  let options: scanBarcode.ScanOptions = {    scanTypes: [scanCore.ScanType.ALL],    enableMultiMode: true,    enableAlbum: true  }  // 默认竖屏  this.cameraHeight = 800  this.cameraWidth = 450  try {    customScan.init(options);  } catch (error) {    console.debug('camera failed to init, error ', JSON.stringify(error));  }}

// 启动相机startCamera() {  // 获取  this.surfaceId = this.mXComponentController.getXComponentSurfaceId();  let viewControl: customScan.ViewControl = {    width: this.cameraWidth,    height: this.cameraHeight,    surfaceId: this.surfaceId  };
  try {    customScan.start(viewControl).then((result: Array<scanBarcode.ScanResult>) => {      // 处理扫码结果      this.showScanResult(result);    })  } catch (error) {    console.debug('camera failed to start, error ', JSON.stringify(error));  }}

// 处理扫描结果showScanResult(result: Array<scanBarcode.ScanResult>) {  if (result.length > 0) {    // 获取到扫描结果后暂停相机流    this.closeCamera()    // 处理扫码结果    let resultStr: string = result[0].originalValue;  }}

// 关闭相机closeCamera() {  try {    customScan.stop();  } catch (error) {    console.debug('camera failed to stop, error ', JSON.stringify(error));  }}
// 释放相机releaseCamera() {  try {    customScan.release()  } catch (error) {    console.debug('camera failed to release, error ', JSON.stringify(error));  }}

// 打开或关闭闪光灯openOrCloseFlashlight() {  try {    if (this.flashStatus) {      customScan.closeFlashLight();      this.flashStatus = false;    } else {      customScan.openFlashLight();      this.flashStatus = true;    }  } catch (error) {    console.debug('camera failed to flashLight, error ', JSON.stringify(error));  }}

// 数据流控制器private mXComponentController: XComponentController = new XComponentController();
// 扫码区域XComponent({  id: 'componentId',  type: 'surface',  controller: this.mXComponentController})  .onLoad(()=>{    // 加载时开始扫描    this.flashStatus = false;    this.initCamera();    this.startCamera();  })  .onDestroy(()=>{    // 组件释放时释放相机（不能使用stop停止相机，会一直黑屏）    this.flashStatus = true;    this.openOrCloseFlashlight();    this.releaseCamera();  })