HarmonyOS 鸿蒙Next 检测是否安装了第三方app

判断微信是否安装,系统从API12开始在bundleManager模块中提供canOpenLink接口，用于查询给定的链接是否可以打开，指定链接的scheme需要在module.json文件的querySchemes字段下配置。参考链接：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-bundlemanager-V5#bundlemanagercanopenlink12
1、在module.json5中添加配置微信的scheme字段

{
  "module": {
    "querySchemes": [
      "weixin"
    ],
    "name": "entry",
    "type": "entry",
    "description": "$string:module_desc",
    "mainElement": "EntryAbility",
    "deviceTypes": [
      "phone",
      "tablet",
      "2in1"
    ],
    "deliveryWithInstall": true,
    "installationFree": false,
    "pages": "$profile:main_pages",
  }
}

2、在页面中做以下判断

import { bundleManager } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { promptAction } from '@kit.ArkUI';
try {
      let link = 'weixin://';
      let data = bundleManager.canOpenLink(link);
      if (data) {
        promptAction.showToast({message:'微信已安装'})
      }else {
        promptAction.showToast({message:'微信未安装'})
      }
    } catch (err) {
      let message = (err as BusinessError).message;
      console.error('canOpenLink failed: %{public}s', message);
    }