一、背景
获取移动设备的地理位置,包含:经度、维度、具体地理位置等,地理位置信息能在许多业务场景中被应用,如导航、地图服务、位置服务、社交媒体等。
下面以一个Demo例子,来实现获取设备地理位置的功能
官方文档指引👉:文档中心
二、实现方法
2.1、申请位置权限
在model.json5文件中的module模块下添加如下请求权限:
javascript
{
"module" : {
"requestPermissions":[
{
"name": "ohos.permission.LOCATION",
},
{
"name": "ohos.permission.APPROXIMATELY_LOCATION"
}
]
}
}
2.2、具体实现
2.2.1、授权询问
先检测权限是否已经授权,如果未授权就弹出授权弹窗
javascript
// 检测权限是否已经授权,如果未授权就弹出授权弹窗
reqPermissionsFromUser(permissions: Array<Permissions>){
let context = getContext(this) as common.UIAbilityContext;
let atManager = abilityAccessCtrl.createAtManager();
// requestPermissionsFromUser会判断权限的授权状态来决定是否唤起弹窗
return atManager.requestPermissionsFromUser(context, permissions).then((data) => {
let grantStatus: Array<number> = data.authResults;
let length: number = grantStatus.length;
for (let i = 0; i < length; i++) {
if (grantStatus[i] === 0) {
// 用户授权,可以继续操作
return true
} else {
// 用户拒绝授权,提示用户必须授权才能访问当前页面的功能,并引导用户到系统设置中打开相应的权限
return false
}
}
// 授权成功
}).catch((err) => {
console.error(`requestPermissionsFromUser failed, code is ${err.code}, message is ${err.message}`);
})
}
2.2.2、获取当前位置
点击定位按钮,获取当前位置,包含:经度、维度、国家、省份及详细地址
javascript
@Entry
@Component
struct Index {
@State mLatitude: string = '' // 经度
@State mLongitude: string = '' // 纬度
@State mAddresses: string = '' // 地址
@State mCountryName: string = '' // 国家名称
@State mAdministrativeArea: string = '' // 省份
@State mLocality: string = '' // 地市
@State mSubLocality: string = '' // 县区
build() {
Column({space:10}) {
Button('定位')
.width('100%')
.margin({ top: 10, bottom: 10 })
.onClick(()=>{
this.getLocation()
})
Text('【当前位置信息】').fontSize(20)
Text(`经度:${this.mLatitude}`).width(260)
Text(`纬度:${this.mLongitude}`).width(260)
Text(`地址:${this.mAddresses}`).width(260)
Text(`县区:${this.mSubLocality}`).width(260)
Text(`地市:${this.mLocality}`).width(260)
Text(`省份:${this.mAdministrativeArea}`).width(260)
Text(`国家:${this.mCountryName}`).width(260)
}
.width('100%')
.height('100%')
.backgroundColor('#EAEAEA')
.padding(10)
}
//获取当前位置
async getLocation(){
let status = await this.reqPermissionsFromUser(['ohos.permission.LOCATION','ohos.permission.APPROXIMATELY_LOCATION'])
if(status){
let location = geoLocationManager.getLastLocation()
console.log('lucy',JSON.stringify(location))
location['locale'] = 'zh'
//逆地理编码服务
geoLocationManager.getAddressesFromLocation(location,(err,data: any)=>{
if(!err){
console.log('lucy--',JSON.stringify(data))
this.mLatitude = data[0].latitude
this.mLongitude = data[0].longitude;
this.mAddresses = data[0].placeName
this.mCountryName = data[0].countryName
this.mAdministrativeArea = data[0].administrativeArea
this.mLocality = data[0].locality
this.mSubLocality = data[0].subLocality
}
})
}
}
}
备注:
真机调试时,使用逆地理编码getAddressesFromLocation获取结果都是英文,在使用getAddressesFromLocation()方法之前,添加location['locale'] = 'zh'参数即可
2.2.3、进入页面与离开页面操作
进入页面授权访问,绑定监听事件;离开页面,取消监听事件
javascript
//进入页面授权访问,绑定监听事件
async aboutToAppear(){
let result = await this.reqPermissionsFromUser(['ohos.permission.LOCATION','ohos.permission.APPROXIMATELY_LOCATION'])
if(result){
geoLocationManager.on('locationChange',{
priority:geoLocationManager.LocationRequestPriority.ACCURACY,
timeInterval:0
},value=>{
console.log('lucy',JSON.stringify(value))})
}
}
//离开页面,取消监听事件
aboutToDisappear(){
geoLocationManager.off('locationChange')
}
2.2.4、完整代码
javascript
import abilityAccessCtrl, { Permissions } from '@ohos.abilityAccessCtrl';
import common from '@ohos.app.ability.common';
import geoLocationManager from '@ohos.geoLocationManager';
@Entry
@Component
struct Index {
@State mLatitude: string = '' // 经度
@State mLongitude: string = '' // 纬度
@State mAddresses: string = '' // 地址
@State mCountryName: string = '' // 国家名称
@State mAdministrativeArea: string = '' // 省份
@State mLocality: string = '' // 地市
@State mSubLocality: string = '' // 县区
//进入页面授权访问,绑定监听事件
async aboutToAppear(){
let result = await this.reqPermissionsFromUser(['ohos.permission.LOCATION','ohos.permission.APPROXIMATELY_LOCATION'])
if(result){
geoLocationManager.on('locationChange',{
priority:geoLocationManager.LocationRequestPriority.ACCURACY,
timeInterval:0
},value=>{
console.log('lucy',JSON.stringify(value))})
}
}
//离开页面,取消监听事件
aboutToDisappear(){
geoLocationManager.off('locationChange')
}
// 检测权限是否已经授权,如果未授权就弹出授权弹窗
reqPermissionsFromUser(permissions: Array<Permissions>){
let context = getContext(this) as common.UIAbilityContext;
let atManager = abilityAccessCtrl.createAtManager();
// requestPermissionsFromUser会判断权限的授权状态来决定是否唤起弹窗
return atManager.requestPermissionsFromUser(context, permissions).then((data) => {
let grantStatus: Array<number> = data.authResults;
let length: number = grantStatus.length;
for (let i = 0; i < length; i++) {
if (grantStatus[i] === 0) {
// 用户授权,可以继续操作
return true
} else {
// 用户拒绝授权,提示用户必须授权才能访问当前页面的功能,并引导用户到系统设置中打开相应的权限
return false
}
}
// 授权成功
}).catch((err) => {
console.error(`requestPermissionsFromUser failed, code is ${err.code}, message is ${err.message}`);
})
}
build() {
Column({space:10}) {
Button('定位')
.width('100%')
.margin({ top: 10, bottom: 10 })
.onClick(()=>{
this.getLocation()
})
Text('【当前位置信息】').fontSize(20)
Text(`经度:${this.mLatitude}`).width(260)
Text(`纬度:${this.mLongitude}`).width(260)
Text(`地址:${this.mAddresses}`).width(260)
Text(`县区:${this.mSubLocality}`).width(260)
Text(`地市:${this.mLocality}`).width(260)
Text(`省份:${this.mAdministrativeArea}`).width(260)
Text(`国家:${this.mCountryName}`).width(260)
}
.width('100%')
.height('100%')
.backgroundColor('#EAEAEA')
.padding(10)
}
//获取当前位置
async getLocation(){
let status = await this.reqPermissionsFromUser(['ohos.permission.LOCATION','ohos.permission.APPROXIMATELY_LOCATION'])
if(status){
let location = geoLocationManager.getLastLocation()
console.log('lucy',JSON.stringify(location))
location['locale'] = 'zh'
//逆地理编码服务
geoLocationManager.getAddressesFromLocation(location,(err,data: any)=>{
if(!err){
console.log('lucy--',JSON.stringify(data))
this.mLatitude = data[0].latitude
this.mLongitude = data[0].longitude;
this.mAddresses = data[0].placeName
this.mCountryName = data[0].countryName
this.mAdministrativeArea = data[0].administrativeArea
this.mLocality = data[0].locality
this.mSubLocality = data[0].subLocality
}
})
}
}
}
2.3、实现效果
进入页面先授权访问位置信息,然后点击定位按钮,获取当前位置信息
**备注:**实现效果需进行真机调试,预览器和本地模拟器实现不了此效果
**最后:**👏👏😊😊😊👍👍