鸿蒙开发之地理位置
一、权限申请
获取位置信息需要先在module.json5中申请权限，而权限的申请在API9版本发生了变动如下
//API9之前只申请这个就可以米级定位
{'name': 'ohos.permission.LOCATION'},//API9之前申请的权限
//API9后两个权限同时申请才可以获取米级定位，只下边一个权限只能精准到5公里
{'name': 'ohos.permission.APPROXIMATELY_LOCATION'},//API9及之后需要增加申请的权限所以，如果是高精度的位置信息需要两个权限都申请，如果只是需要模糊定位为了节能只需要第二个权限就够了。
二、检测用户权限
1、检测用户权限需要先获取Token，token是异步回调的
import abilityAccessCtrl, { Permissions } from '@ohos.abilityAccessCtrl';
async accessToken(permission: Permissions): Promise {
let atManager = abilityAccessCtrl.createAtManager()
let grantStatus: abilityAccessCtrl.GrantStatus
let tokenID: number
try {
let bundleInfo = await bundleManager.getBundleInfoForSelf(bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION)
tokenID = bundleInfo.appInfo.accessTokenId
} catch (err) {
console.log('location 获取地理位置token失败')
}
try {
grantStatus = await atManager.checkAccessToken(tokenID,permission)
} catch (err) {
console.log('获取地理位置token检测失败')
}
return grantStatus
} 2、获取token后，开始查询用户权限状态
async checkPermission() {
let permissions: Array = ['ohos.permission.LOCATION','ohos.permission.APPROXIMATELY_LOCATION']
let locationStatus = await this.accessToken(permissions[0])
let roximateyStatus = await this.accessToken(permissions[1])
if (locationStatus == abilityAccessCtrl.GrantStatus.PERMISSION_GRANTED &&
roximateyStatus == abilityAccessCtrl.GrantStatus.PERMISSION_GRANTED) {
console.log('location 已经申请完权限了')
} else {
console.log('location 需要申请权限')
this.requestPermission()
}
} 三、申请权限
//申请权限
requestPermission() {
let atManager = abilityAccessCtrl.createAtManager()
let permissions: Array = ['ohos.permission.LOCATION','ohos.permission.APPROXIMATELY_LOCATION']
atManager.requestPermissionsFromUser(getContext(this),permissions,(err,permissionResult) => {
if (err) {
console.log('申请权限失败')
return
}
let grantStatus: Array = permissionResult.authResults
let grantPermissions: Array = permissionResult.permissions
let length: number = grantStatus.length
console.log('location user permissioned length' + JSON.stringify(grantPermissions)+length)
for(let i = 0; i {
console.log('location open setting page')
}).catch((err) => {
console.log('location open setting page failed')
})
} 四、权限完成后，开启定位
startLocate() {
this.checkPermission().then(() => {
let requestInfo = {'priority': 0x203, 'scenario': 0x300, 'timeInterval': 0, 'distanceInterval': 0, 'maxAccuracy': 0};
let locationChange = (location) => {
console.log('location change:data = '+JSON.stringify(location))
}
try {
//监听位置变化
geoLocationManager.on('locationChange',requestInfo,locationChange)
} catch (err) {
console.error("location change errCode:" + err.code + ",errMessage:" + err.message)
}
try {
//获取当前的地理位置（坐标等）
geoLocationManager.getCurrentLocation((err,location) => {
if (err) {
console.log('location getCurrentLocation err = '+JSON.stringify(err))
}
if (location) {
console.log('location getCurrentLocation = '+JSON.stringify(location))
//{"latitude":40,"longitude":116,"altitude":43.5,"accuracy":5,"speed":0,"timeStamp":1704176491,"direction":45,"timeSinceBoot":13563917977759,"additions":"","additionSize":0,"isFromMock":false}
let latitude = location.latitude
let longitude = location.longitude
let maxItems = 1
let reverseGeocodeReq = {'latitude':latitude,'longitude':longitude,'maxItems':maxItems}
//根据坐标转化为地理描述
geoLocationManager.getAddressesFromLocation(reverseGeocodeReq,(err,val) => {
if (err) {
console.log('location getAddressesFromLocation err = '+JSON.stringify(err))
//这里一直报错，怀疑是模拟器的问题。看错误code说可能网络问题需要重试，但是重试多次还是如下报错，如果可以还是用真机试试
//{"code":3301300,"message":"BussinessError 3301300: Reverse geocoding query failed."}
}
if (val) {
console.log('location getAddressesFromLocation = '+JSON.stringify(val))
}
})
//获取国家码
geoLocationManager.getCountryCode((err,val) => {
if (err) {
console.log('location getCountryCode err = '+JSON.stringify(err))
}
if (val) {
console.log('location getCountryCode = '+JSON.stringify(val))
//location getCountryCode = {"country":"CN","type":4}
}
})
}
})
} catch (err) {
console.log('location getCurrentLocation catch err = '+JSON.stringify(err))
}
}).catch(err => {
console.error("location permission errCode:" + err.code + ",errMessage:" + err.message)
})
}五、ets中全部代码
import geoLocationManager from '@ohos.geoLocationManager';
import abilityAccessCtrl, { Permissions } from '@ohos.abilityAccessCtrl';
import bundleManager from '@ohos.bundle.bundleManager';
import common from '@ohos.app.ability.common';
@Entry
@Component
struct OfficialLocationPage {
@State message: string = '开始定位'
build() {
Row() {
Column() {
Text(this.message)
.fontSize(18)
.fontWeight(FontWeight.Bold)
.onClick(() => {
this.startLocate()
})
}
.width('100%')
}
.height('100%')
}
async accessToken(permission: Permissions): Promise {
let atManager = abilityAccessCtrl.createAtManager()
let grantStatus: abilityAccessCtrl.GrantStatus
let tokenID: number
try {
let bundleInfo = await bundleManager.getBundleInfoForSelf(bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION)
tokenID = bundleInfo.appInfo.accessTokenId
} catch (err) {
console.log('location 获取地理位置token失败')
}
try {
grantStatus = await atManager.checkAccessToken(tokenID,permission)
} catch (err) {
console.log('获取地理位置token检测失败')
}
return grantStatus
}
async checkPermission() {
let permissions: Array = ['ohos.permission.LOCATION','ohos.permission.APPROXIMATELY_LOCATION']
let locationStatus = await this.accessToken(permissions[0])
let roximateyStatus = await this.accessToken(permissions[1])
if (locationStatus == abilityAccessCtrl.GrantStatus.PERMISSION_GRANTED &&
roximateyStatus == abilityAccessCtrl.GrantStatus.PERMISSION_GRANTED) {
console.log('location 已经申请完权限了')
} else {
console.log('location 需要申请权限')
this.requestPermission()
}
}
requestPermission() {
let atManager = abilityAccessCtrl.createAtManager()
let permissions: Array = ['ohos.permission.LOCATION','ohos.permission.APPROXIMATELY_LOCATION']
atManager.requestPermissionsFromUser(getContext(this),permissions,(err,permissionResult) => {
if (err) {
console.log('申请权限失败')
return
}
let grantStatus: Array = permissionResult.authResults
let grantPermissions: Array = permissionResult.permissions
let length: number = grantStatus.length
console.log('location user permissioned length' + JSON.stringify(grantPermissions)+length)
for(let i = 0; i {
console.log('location open setting page')
}).catch((err) => {
console.log('location open setting page failed')
})
}
startLocate() {
this.checkPermission().then(() => {
let requestInfo = {'priority': 0x203, 'scenario': 0x300, 'timeInterval': 0, 'distanceInterval': 0, 'maxAccuracy': 0};
let locationChange = (location) => {
console.log('location change:data = '+JSON.stringify(location))
}
try {
geoLocationManager.on('locationChange',requestInfo,locationChange)
} catch (err) {
console.error("location change errCode:" + err.code + ",errMessage:" + err.message)
}
try {
//获取当前的地理位置
geoLocationManager.getCurrentLocation((err,location) => {
if (err) {
console.log('location getCurrentLocation err = '+JSON.stringify(err))
}
if (location) {
console.log('location getCurrentLocation = '+JSON.stringify(location))
//{"latitude":40,"longitude":116,"altitude":43.5,"accuracy":5,"speed":0,"timeStamp":1704176491,"direction":45,"timeSinceBoot":13563917977759,"additions":"","additionSize":0,"isFromMock":false}
let latitude = location.latitude
let longitude = location.longitude
let maxItems = 1
let reverseGeocodeReq = {'latitude':latitude,'longitude':longitude,'maxItems':maxItems}
//根据坐标转化为地理描述
geoLocationManager.getAddressesFromLocation(reverseGeocodeReq,(err,val) => {
if (err) {
console.log('location getAddressesFromLocation err = '+JSON.stringify(err))
//{"code":3301300,"message":"BussinessError 3301300: Reverse geocoding query failed."}
}
if (val) {
console.log('location getAddressesFromLocation = '+JSON.stringify(val))
}
})
//获取国家码
geoLocationManager.getCountryCode((err,val) => {
if (err) {
console.log('location getCountryCode err = '+JSON.stringify(err))
}
if (val) {
console.log('location getCountryCode = '+JSON.stringify(val))
//location getCountryCode = {"country":"CN","type":4}
}
})
}
})
} catch (err) {
console.log('location getCurrentLocation catch err = '+JSON.stringify(err))
}
}).catch(err => {
console.error("location permission errCode:" + err.code + ",errMessage:" + err.message)
})
}
}