@@ -10,18 +10,17 @@ The geographic description helps users understand a location easily by providing
## Available APIs
The following table describes APIs available for mutual conversion between coordinates and location information.
The following table describes APIs available for mutual conversion between coordinates and geographic description. For details, see [Geolocation Manager](../reference/apis/js-apis-geoLocationManager.md).
**Table1** APIs for geocoding and reverse geocoding
| API | Description |
| -------- | -------- |
| isGeoServiceAvailable(callback: AsyncCallback<boolean>) : void | Checks whether the (reverse) geocoding service is available. This function uses an asynchronous callback to return the result. |
| isGeoServiceAvailable() : Promise<boolean> | Checks whether the (reverse) geocoding service is available. This function uses a promise to return the result. |
| getAddressesFromLocation(request: ReverseGeoCodeRequest, callback: AsyncCallback<Array<GeoAddress>>) : void | Converts coordinates into geographic description through reverse geocoding. This function uses an asynchronous callback to return the result. |
| getAddressesFromLocation(request: ReverseGeoCodeRequest) : Promise<Array<GeoAddress>>; | Converts coordinates into geographic description through reverse geocoding. This function uses a promise to return the result. |
| getAddressesFromLocationName(request: GeoCodeRequest, callback: AsyncCallback<Array<GeoAddress>>) : void | Converts geographic description into coordinates through geocoding. This function uses an asynchronous callback to return the result. |
| getAddressesFromLocationName(request: GeoCodeRequest) : Promise<Array<GeoAddress>> | Converts geographic description into coordinates through geocoding. This function uses a promise to return the result. |
| isGeocoderAvailable(): boolean; | Obtains the (reverse) geocoding service status.|
| getAddressesFromLocation(request: ReverseGeoCodeRequest, callback: AsyncCallback<Array<GeoAddress>>): void | Converts coordinates into geographic description through reverse geocoding. This API uses an asynchronous callback to return the result. |
| getAddressesFromLocation(request: ReverseGeoCodeRequest): Promise<Array<GeoAddress>> | Converts coordinates into geographic description through reverse geocoding. This API uses a promise to return the result. |
| getAddressesFromLocationName(request: GeoCodeRequest, callback: AsyncCallback<Array<GeoAddress>>): void | Converts geographic description into coordinates through geocoding. This API uses an asynchronous callback to return the result. |
| getAddressesFromLocationName(request: GeoCodeRequest): Promise<Array<GeoAddress>> | Converts geographic description into coordinates through geocoding. This API uses a promise to return the result. |
## How to Develop
...
...
@@ -30,30 +29,29 @@ The following table describes APIs available for mutual conversion between coord
>
> The **GeoConvert** instance needs to access backend services to obtain information. Therefore, before performing the following steps, ensure that your device is connected to the network.
1. Import the **geolocation** module by which you can implement all APIs related to the geocoding and reverse geocoding conversion capabilities.
1. Import the **geoLocationManager** module by which you can implement all APIs related to the geocoding and reverse geocoding conversion capabilities.
@@ -62,12 +60,12 @@ The following table describes APIs available for mutual conversion between coord
});
```
Your application can obtain the **GeoAddress** list that matches the specified coordinates and then read location information from it. For details, see [Geolocation](../reference/apis/js-apis-geolocation.md).
Your application can obtain the **GeoAddress** list that matches the specified coordinates and then read location information from it. For details, see [Geolocation](../reference/apis/js-apis-geoLocationManager.md).
- Call **getAddressesFromLocationName** to convert geographic description into coordinates.
```
```ts
vargeocodeRequest={"description":"No. xx, xx Road, Pudong District, Shanghai","maxItems":1};
@@ -76,6 +74,6 @@ The following table describes APIs available for mutual conversion between coord
});
```
Your application can obtain the **GeoAddress** list that matches the specified location information and read coordinates from it. For details, see [Geolocation](../reference/apis/js-apis-geolocation.md).
Your application can obtain the **GeoAddress** list that matches the specified location information and read coordinates from it. For details, see [Geolocation](../reference/apis/js-apis-geoLocationManager.md).
To improve the accuracy of location results, you can set the longitude and latitude ranges in **GeoCodeRequest**.
| on(type: 'locationChange', request: LocationRequest, callback: Callback<Location>) : void | Registers a listener for location changes with a location request initiated. |
| off(type: 'locationChange', callback?: Callback<Location>) : void | Unregisters the listener for location changes with the corresponding location request deleted. |
| on(type: 'locationServiceState', callback: Callback<boolean>) : void | Registers a listener for location service status change events. |
| off(type: 'locationServiceState', callback: Callback<boolean>) : void | Unregisters the listener for location service status change events. |
| on(type: 'cachedGnssLocationsReporting', request: CachedGnssLocationsRequest, callback: Callback<Array<Location>>) : void; | Registers a listener for cached GNSS location reports. |
| off(type: 'cachedGnssLocationsReporting', callback?: Callback<Array<Location>>) : void; | Unregisters the listener for cached GNSS location reports. |
| on(type: 'gnssStatusChange', callback: Callback<SatelliteStatusInfo>) : void; | Registers a listener for satellite status change events. |
| off(type: 'gnssStatusChange', callback?: Callback<SatelliteStatusInfo>) : void; | Unregisters the listener for satellite status change events. |
| on(type: 'nmeaMessageChange', callback: Callback<string>) : void; | Registers a listener for GNSS NMEA message change events. |
| off(type: 'nmeaMessageChange', callback?: Callback<string>) : void; | Unregisters the listener for GNSS NMEA message change events. |
| on(type: 'fenceStatusChange', request: GeofenceRequest, want: WantAgent) : void; | Registers a listener for status change events of the specified geofence. |
| off(type: 'fenceStatusChange', request: GeofenceRequest, want: WantAgent) : void; | Unregisters the listener for status change events of the specified geofence. |
| getCurrentLocation(request: CurrentLocationRequest, callback: AsyncCallback<Location>) : void | Obtains the current location. This API uses an asynchronous callback to return the result. |
| getCurrentLocation(request?: CurrentLocationRequest) : Promise<Location> | Obtains the current location. This API uses a promise to return the result. |
| getLastLocation(callback: AsyncCallback<Location>) : void | Obtains the previous location. This API uses an asynchronous callback to return the result. |
| getLastLocation() : Promise<Location> | Obtains the previous location. This API uses a promise to return the result. |
| isLocationEnabled(callback: AsyncCallback<boolean>) : void | Checks whether the location service is enabled. This API uses an asynchronous callback to return the result. |
| isLocationEnabled() : Promise<boolean> | Checks whether the location service is enabled. This API uses a promise to return the result. |
| requestEnableLocation(callback: AsyncCallback<boolean>) : void | Requests to enable the location service. This API uses an asynchronous callback to return the result. |
| requestEnableLocation() : Promise<boolean> | Requests to enable the location service. This API uses a promise to return the result. |
| enableLocation(callback: AsyncCallback<boolean>) : void | Enables the location service. This API uses an asynchronous callback to return the result. |
| enableLocation() : Promise<boolean> | Enables the location service. This API uses a promise to return the result. |
| disableLocation(callback: AsyncCallback<boolean>) : void | Disables the location service. This API uses an asynchronous callback to return the result. |
| disableLocation() : Promise<boolean> | Disables the location service. This API uses a promise to return the result. |
| getCachedGnssLocationsSize(callback: AsyncCallback<number>) : void; | Obtains the number of cached GNSS locations. This API uses an asynchronous callback to return the result. |
| getCachedGnssLocationsSize() : Promise<number>; | Obtains the number of cached GNSS locations. This API uses a promise to return the result. |
| flushCachedGnssLocations(callback: AsyncCallback<boolean>) : void; | Obtains all cached GNSS locations and clears the GNSS cache queue. This API uses an asynchronous callback to return the result.|
| flushCachedGnssLocations() : Promise<boolean>; | Obtains all cached GNSS locations and clears the GNSS cache queue. This API uses a promise to return the result.|
| sendCommand(command: LocationCommand, callback: AsyncCallback<boolean>) : void; | Sends extended commands to the location subsystem. This API uses an asynchronous callback to return the result.|
| sendCommand(command: LocationCommand) : Promise<boolean>; | Sends extended commands to the location subsystem. This API uses a promise to return the result. |
| isLocationPrivacyConfirmed(type : LocationPrivacyType, callback: AsyncCallback<boolean>) : void; | Checks whether a user agrees with the privacy statement of the location service. This API uses an asynchronous callback to return the result.|
| isLocationPrivacyConfirmed(type : LocationPrivacyType,) : Promise<boolean>; | Checks whether a user agrees with the privacy statement of the location service. This API uses a promise to return the result.|
| setLocationPrivacyConfirmStatus(type : LocationPrivacyType, isConfirmed : boolean, callback: AsyncCallback<boolean>) : void; | Sets the user confirmation status for the privacy statement of the location service. This API uses an asynchronous callback to return the result.|
| setLocationPrivacyConfirmStatus(type : LocationPrivacyType, isConfirmed : boolean) : Promise<boolean>; | Sets the user confirmation status for the privacy statement of the location service. This API uses a promise to return the result.|
For details about the APIs used to obtain the device location information, see [Geolocation Manager](../reference/apis/js-apis-geoLocationManager.md).
## How to Develop
To learn more about the APIs for obtaining device location information, see [Geolocation](../reference/apis/js-apis-geolocation.md).
To learn more about the APIs for obtaining device location information, see [Geolocation](../reference/apis/js-apis-geoLocationManager.md).
1. Before using basic location capabilities, check whether your application has been granted the permission to access the device location information. If not, your application needs to obtain the permission from the user as described below.
The system provides the following location permissions:
- ohos.permission.LOCATION
- ohos.permission.APPROXIMATELY_LOCATION
- ohos.permission.LOCATION_IN_BACKGROUND
The **ohos.permission.LOCATION** permission is a must if your application needs to access the device location information.
If your application needs to access the device location information, it must first apply for required permissions. Specifically speaking:
API versions earlier than 9: Apply for **ohos.permission.LOCATION**.
API version 9 and later: Apply for **ohos.permission.APPROXIMATELY\_LOCATION**, or apply for **ohos.permission.APPROXIMATELY\_LOCATION** and **ohos.permission.LOCATION**. Note that **ohos.permission.LOCATION** cannot be applied for separately.
| Earlier than 9| ohos.permission.LOCATION | Success| Location accurate to meters|
| 9 and later| ohos.permission.LOCATION | Failure| No location obtained|
| 9 and later| ohos.permission.APPROXIMATELY_LOCATION | Success| Location accurate to 5 kilometers|
| 9 and later| ohos.permission.APPROXIMATELY_LOCATION and ohos.permission.LOCATION| Success| Location accurate to meters|
If your application needs to access the device location information when running on the background, it must be configured to be able to run on the background and be granted the **ohos.permission.LOCATION_IN_BACKGROUND** permission. In this way, the system continues to report device location information after your application moves to the background.
You can declare the required permission in your application's configuration file. For details, see [Access Control (Permission) Development](../security/accesstoken-guidelines.md).
2. Import the **geolocation** module by which you can implement all APIs related to the basic location capabilities.
2. Import the **geoLocationManager** module by which you can implement all APIs related to the basic location capabilities.
3. Instantiate the **LocationRequest** object. This object provides APIs to notify the system of the location service type and the interval of reporting location information.<br>
...
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@@ -80,7 +53,7 @@ To learn more about the APIs for obtaining device location information, see [Geo
To better serve your needs for using APIs, the system has categorized APIs into different packages to match your common use cases of the location function. In this way, you can directly use the APIs specific to a certain use case, making application development much easier. The following table lists the use cases currently supported.
```
```ts
exportenumLocationRequestScenario{
UNSET=0x300,
NAVIGATION,
...
...
@@ -104,8 +77,8 @@ To learn more about the APIs for obtaining device location information, see [Geo
Sample code for initializing **requestInfo** for navigation:
4. Instantiate the **Callback** object for the system to report location results.
Your application needs to implement the callback defined by the system. When the system successfully obtains the real-time location of a device, it will report the location result to your application through the callback interface. Your application can implement the callback interface in such a way to complete your own service logic.
> - The APIs of this module are no longer maintained since API version 7. It is recommended that you use [`@ohos.geolocation`](js-apis-geolocation.md) instead.
>
> **NOTE**
> - The initial APIs of this module are supported since API version 3. Newly added APIs will be marked with a superscript to indicate their earliest API version.
> - The APIs provided by this module are no longer maintained since API version 9. You are advised to use [geoLocationManager](js-apis-geoLocationManager.md) instead.
## Modules to Import
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...
@@ -19,19 +18,22 @@ import geolocation from '@system.geolocation';
> This API is deprecated since API version 9. You are advised to use [geoLocationManager.getCurrentLocation](js-apis-geoLocationManager.md#geolocationmanagergetcurrentlocation).
| timeout | number | No | Timeout duration, in milliseconds. The default value is **30000**.<br/>The timeout duration is necessary in case the request to obtain the geographic location is rejected for the lack of the required permission, weak positioning signal, or incorrect location settings. After the timeout duration expires, the fail function will be called.<br/>The value is a 32-digit positive integer. If the value set is less than or equal to **0**, the default value will be used. |
| timeout | number | No | Timeout duration, in milliseconds. The default value is **30000**.<br>The timeout duration is necessary in case the request to obtain the geographic location is rejected for the lack of the required permission, weak positioning signal, or incorrect location settings. After the timeout duration expires, the fail function will be called.<br>The value is a 32-digit positive integer. If the value set is less than or equal to **0**, the default value will be used. |
| coordType | string | No | Coordinate system type. Available types can be obtained by **getSupportedCoordTypes**. The default type is **wgs84**. |
| success | Function | No | Called when the operation is successful. |
| fail | Function | No | Called when the operation fails. |
Listens to the geographical location. If this method is called multiple times, the last call takes effect.
> **NOTE**
> This API is deprecated since API version 9. You are advised to use [geoLocationManager.on('locationChange')](js-apis-geoLocationManager.md#geolocationmanageronlocationchange).
> This API is deprecated since API version 9. You are advised to use [geoLocationManager.off('locationChange')](js-apis-geoLocationManager.md#geolocationmanagerofflocationchange).
