目录

HarmonyOS在未连接网络时能否获取位置信息

问题现象

在设备处于断网或未连接至互联网的离线运行模式下，HarmonyOS系统是否仍具备基于其内部定位架构（例如通过整合惯性传感器、本地缓存的地理信息数据、以及接收来自全球导航卫星系统的信号）来完成对终端地理位置的判定与数据提取能力？

解决方案

在未连接网络的前提下，可通过在本地运行以下代码实现位置信息的获取。

  1. 配置位置权限，示例代码如下：
    {
  "module": {
    "name": "entry",
    "type": "entry",
    "description": "$string:module_desc",
    "mainElement": "EntryAbility",
    "deviceTypes": [
      "phone"
    ],
    "deliveryWithInstall": true,
    "installationFree": false,
    "pages": "$profile:main_pages",
    "abilities": [
      {
        "name": "EntryAbility",
        "srcEntry": "./ets/entryability/EntryAbility.ets",
        "description": "$string:EntryAbility_desc",
        "icon": "$media:layered_image",
        "label": "$string:EntryAbility_label",
        "startWindowIcon": "$media:startIcon",
        "startWindowBackground": "$color:start_window_background",
        "exported": true,
        "skills": [
          {
            "entities": [
              "entity.system.home"
            ],
            "actions": [
              "ohos.want.action.home"
            ]
          }
        ]
      }
    ],
    "extensionAbilities": [
      {
        "name": "EntryBackupAbility",
        "srcEntry": "./ets/entrybackupability/EntryBackupAbility.ets",
        "type": "backup",
        "exported": false,
        "metadata": [
          {
            "name": "ohos.extension.backup",
            "resource": "$profile:backup_config"
          }
        ],
      }
    ],
    "requestPermissions": [
      {
        "name": "ohos.permission.APPROXIMATELY_LOCATION",
        "reason": "$string:reasondetail",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when": "inuse"
        }
      },
      {
        "name": "ohos.permission.LOCATION",
        "reason": "$string:reasondetail",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when": "inuse"
        }
      }
    ]
  }
}
  2. 管理用户授权和获取位置信息，示例代码如下：
    import { geoLocationManager } from '@kit.LocationKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { abilityAccessCtrl, common, Permissions } from '@kit.AbilityKit';

@Entry
@Component
struct Index {
  @State message: string = '获取位置信息';
  permissions: Array<Permissions> = ['ohos.permission.APPROXIMATELY_LOCATION', 'ohos.permission.LOCATION'];

  aboutToAppear(): void {
    this.requestPermissions(this.permissions);
  }

  requestPermissions(permissions: Array<Permissions>): void {
    let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager();
    let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
    atManager.requestPermissionsFromUser(context, permissions);
  }

  testMethod() {
    let request: geoLocationManager.SingleLocationRequest = {
      'locatingPriority': geoLocationManager.LocatingPriority.PRIORITY_LOCATING_SPEED,
      'locatingTimeoutMs': 10000
    };
    try {
      geoLocationManager.getCurrentLocation(request).then((result) => { // 调用getCurrentLocation获取当前设备位置，通过promise接收上报的位置
        console.info('current location: ', JSON.stringify(result));
      })
        .catch((error: BusinessError) => { // 接收上报的错误码
          console.error('promise, getCurrentLocation: error=' + JSON.stringify(error));
        });
    } catch (err) {
      console.error('errCode:' + JSON.stringify(err));
    }
  }

  build() {
    RelativeContainer() {
      Text(this.message)
        .fontSize($r('app.float.page_text_font_size'))
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
        .onClick(() => {
          this.message = '成功获取位置信息';
          this.testMethod();
        });
    }
    .height('100%')
    .width('100%');
  }
}