HarmonyOS NEXT 添加地理围栏
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；提单到华为，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。
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