折叠屏扫描二维码方案

// 向用户申请授权
let context = getContext() as common.UIAbilityContext;
let atManager = abilityAccessCtrl.createAtManager();
let grantStatusArr = await atManager.requestPermissionsFromUser(context, [ 'ohos.permission.CAMERA' ]);
const grantStatus = grantStatusArr.authResults[0];

// TODO：知识点：相机流显示依赖XComponent
XComponent({
  id: CommonConstants.CAMERA_XCOMPONENT_ID,
  type: CommonConstants.CAMERA_XCOMPONENT_TYPE,
  controller: this.cameraSurfaceController
})
  .onLoad(() => {
    // TODO：知识点：customScan依赖XComponent组件的surfaceId，对图像进行扫描
    this.customScanVM.surfaceId = this.cameraSurfaceController.getXComponentSurfaceId();
    // TODO：知识点：XComponent加载完成后，启动相机进行扫码
    this.customScanVM.startCustomScan();
  })

try {
  const viewControl: customScan.ViewControl = {
    width: this.cameraCompWidth,
    height: this.cameraCompHeight,
    surfaceId: this.surfaceId
  };
  customScan.start(viewControl)
    .then((result: Array<scanBarcode.ScanResult>) => {
      // 处理扫码结果
      this.showScanResult(result);
    })
} catch (error) {
  logger.error('start fail, error: %{public}s ', JSON.stringify(error));
}

let showMsg: string = '';
// 处理扫码结果
scanResult.forEach((result: scanBarcode.ScanResult) => {
  // 码源信息
  const originalValue: string = result.originalValue;
  // 二维码在屏幕上的位置
  const scanCodeRect: scanBarcode.ScanCodeRect | undefined = result.scanCodeRect;

  if (scanCodeRect) {
    showMsg += `内容: ${originalValue}\n坐标: ${JSON.stringify(scanCodeRect)}\n`;
  }
})

display.on('foldStatusChange', async (curFoldStatus: display.FoldStatus) => {
  // 同一个状态重复触发不做处理
  if (this.curFoldStatus === curFoldStatus) {
    return;
  }

  // 缓存当前折叠状态
  this.curFoldStatus = curFoldStatus;

  if (this.curFoldStatus === display.FoldStatus.FOLD_STATUS_EXPANDED
    || this.curFoldStatus === display.FoldStatus.FOLD_STATUS_FOLDED) {
    // 当前没有相机流资源，只更新相机流宽高设置
    if (!this.surfaceId) {
      this.updateCameraCompSize();
      return;
    }

    // 关闭闪光灯
    this.tryCloseFlashLight();
    setTimeout(() => {
      // 释放扫码资源
      this.releaseCustomScan();
      // 重新启动扫码
      this.restartCustomScan();
    }, 10)
  }
})

customscan                           // har类型
|---common
|   |---constants
|   |    |---CommonConstants.ets     // 通用常量
|---components
|   |---CustomScanCameraComp.ets     // 自定义组件-二维码扫描相机流组件
|   |---CustomScanCtrlComp.ets       // 自定义组件-二维码扫描控制菜单组件
|---model
|   |---PermissionModel.ets          // 模型层-权限控制管理器
|   |---WindowModel.ets              // 模型层-窗口管理器 
|---pages
|   |---CustomScanPage.ets           // 展示层-二维码扫描页面 
|---viewmodel
|   |---CustomScanViewModel.ets      // 控制层-二维码扫描控制器