HarmonyOS NEXT 添加地理围栏-原创手记-慕课网

添加一个围栏，并订阅地理围栏事件，地理围栏就是虚拟地理边界，当设备进入、离开某个特定地理区域时，可以接收自动通知和警告

目前仅支持圆形围栏，并且依赖GNSS芯片的地理围栏功能，仅在室外开阔区域才能准确识别用户进出围栏事件

geofence: geoLocationManager.Geofence中的coordinateSystemType表示地理围栏圆心坐标的坐标系,APP应先使用getGeofenceSupportedCoordTypes查询支持的坐标系，然后传入正确的圆心坐标；

经纬度是围栏的中心点坐标；

radius是围栏的有效半径；

expiration是围栏的有效时间，单位是毫秒

let transitionStatusList: Array<geoLocationManager.GeofenceTransitionEvent> 是指定APP需要监听的地理围栏事件类型，这里表示需要监听进入围栏和退出围栏事件

之后构造GNSS地理围栏请求对象gnssGeofenceRequest：let gnssGeofenceRequest: geoLocationManager.GnssGeofenceRequest

将对象传入addGnssGeofence方法中就可以添加围栏了，添加成功后会返回围栏id

围栏不使用后要调用removeGnssGeofence移除围栏，避免占用性能

import { geoLocationManager } from '@kit.LocationKit';
import { BusinessError, Callback } from '@kit.BasicServicesKit';
import { promptAction } from '@kit.ArkUI';

const TAG: string = 'DDLocation';

export function gnssFenceStatusChange(geofence: geoLocationManager.Geofence,
  transitionCallback: (err : BusinessError, transition : geoLocationManager.GeofenceTransition)=>void): Promise<number> {
  return new Promise((resolve, reject) => {
    if (geofence === undefined) {
      geofence = {
        latitude: 31.871813745575167 ,
        longitude: 118.82020007987227 ,
        coordinateSystemType: geoLocationManager.CoordinateSystemType.WGS84,
        radius: 10,
        expiration: 360000,
      }
    }

    if (transitionCallback === undefined) {
      transitionCallback = (err : BusinessError, transition : geoLocationManager.GeofenceTransition) => {
        if (err) {
          console.error(TAG, 'geofenceTransitionCallback: err=' + JSON.stringify(err));
        }
        if (transition) {
          console.info(TAG, "GeofenceTransition: %{public}s", JSON.stringify(transition));
          promptAction.showToast({
            message: JSON.stringify(transition),
            duration: 5000
          })
        }
      }
    }

    let transitionStatusList: Array<geoLocationManager.GeofenceTransitionEvent> = [
      geoLocationManager.GeofenceTransitionEvent.GEOFENCE_TRANSITION_EVENT_ENTER,
      geoLocationManager.GeofenceTransitionEvent.GEOFENCE_TRANSITION_EVENT_EXIT,
    ];

    let gnssGeofenceRequest: geoLocationManager.GnssGeofenceRequest = {
      geofence: geofence,
      monitorTransitionEvents: transitionStatusList,
      geofenceTransitionCallback: transitionCallback
    }
    try {
      geoLocationManager.addGnssGeofence(gnssGeofenceRequest).then((id) => {
        console.info(TAG, "addGnssGeofence success, fence id: " + id);
        resolve(id);
      }).catch((err: BusinessError) => {
        console.error(TAG, "addGnssGeofence failed, promise errCode:" + (err as BusinessError).code +
          ",errMessage:" + (err as BusinessError).message);
        reject(err);
      });
    } catch(error) {
      console.error(TAG, "addGnssGeofence failed, err:" + JSON.stringify(error));
      reject(error);
    }
  });
}

export function removeGnssGeofence(fenceId: number): Promise<void> {
  return new Promise((resolve, reject) => {
    try {
      console.info(TAG, "removeGnssGeofence begin fenceId:" + fenceId);

      geoLocationManager.removeGnssGeofence(fenceId).then(() => {
        console.info(TAG, "removeGnssGeofence success fenceId:" + fenceId);
        resolve();
      }).catch((error : BusinessError) => {
        console.error(TAG, "removeGnssGeofence: error=" + JSON.stringify(error));
        reject(error);
      });
    } catch(error) {
      console.error(TAG, "removeGnssGeofence: error=" + JSON.stringify(error));
      reject(error);
    }
  });
}

当前api14在mate60上添加围栏时，偶现报错3301000 - The location service is unavailable；提工单到华为官网，反馈的建议是手机要链接外网，或者插入SIM卡

我是关机重启后，链接了热点进行测试的，目前没有再复现该报错

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后面会继续补充不足之处。