前言

在前文MapBox地图样式v11中，使用Style的localizeLabels方法本地化地图语言。但Mapbox Standard样式和Mapbox Standard Satellite样式仍显示英文。本文将介绍MapBox国际化功能的使用方法。

遇到的问题

在前文本地化样式时，使用了localizeLabels方法，源码如下：

fun MapboxStyleManager.localizeLabels(locale: Locale, layerIds: List<String>? = null) {if (styleURI == "mapbox://styles/mapbox/standard") {throw RuntimeException("Mapbox Standard style does not support client-side runtime localization." +" Consider using Mapbox internationalization capability instead: https://www.mapbox.com/blog/maps-internationalization-34-languages")}setMapLanguage(locale, this, layerIds)
}

通过源码可以看出，若尝试切换Mapbox Standard地图语言时，SDK会抛出异常，并给出提示：不支持客户端运行时本地化，考虑使用Mapbox 国际化功能……

Mapbox Standard style does not support client-side runtime localization.

Consider using Mapbox internationalization capability …

那么MapBox推荐的国际化功能是什么？又如何实现Mapbox Standard样式地图语言的切换？从异常给出的链接可以找到答案。

国际化功能

Dynamically Localize Your Maps with Our New Internationalization Capability(2022)，摘取部分原文：

• Mapbox Internationalization Makes Localizing Maps Easy.

• No more building and maintaining hundreds of styles.

• With a more finite number of styles, the map loads dynamically and more quickly based on the users device or browser.

• Rendering is dynamic and fast based on preferences in the device or browser, so users do not need to manually select a language display on the map.

原文给出的方案(V10版)

// Create a settings service instance as PERSISTENT, the 
// language set will be persisted across the application lifecycle.
private val settingsService: SettingsServiceInterface by lazy {SettingsServiceFactory.getInstance(SettingsServiceStorageType.PERSISTENT)
}

val locale = context.getResources().getConfiguration().locale
// set language in bcp-47 tag
val language = locale.language().toLanguageTag();
settingsService.set(MapboxCommonSettings.LANGUAGE, Value(language))// set worldview
val worldView = "US"
settingsService.set(MapboxCommonSettings.WORLDVIEW, Value(worldView))

migrate-to-v11

在V11版中SettingsServiceInterface没有定义，参考官网migrate-to-v11中的说明：

The interface SettingsServiceInterface has been removed in favor of class SettingsService. SettingsServiceFactory.getInstance(...) now returns the SettingsService class.

适用于V11版的代码

// Create a settings service instance as PERSISTENT,
// the language set will be persisted across the application lifecycle.
private val settingsService: SettingsService by lazy {SettingsServiceFactory.getInstance(SettingsServiceStorageType.PERSISTENT)
}

val locale = context.resources.configuration.locales[0]
// set language in bcp-47 tag
val language = locale.toLanguageTag()
settingsService.set(MapboxCommonSettings.LANGUAGE, Value(language))// set worldview
val worldView = "CN"
settingsService.set(MapboxCommonSettings.WORLDVIEW, Value(worldView))

// worldview: CN (China), IN (India), JP (Japan), US (United States)

示例

MapStyle类

修改Style的本地化示例代码

package com.example.mapdemoimport android.content.Context
import com.mapbox.bindgen.Value
import com.mapbox.common.MapboxCommonSettings
import com.mapbox.common.SettingsService
import com.mapbox.common.SettingsServiceFactory
import com.mapbox.common.SettingsServiceStorageType
import com.mapbox.maps.MapboxMap
import com.mapbox.maps.Style
import com.mapbox.maps.extension.localization.localizeLabels
import java.util.Localeclass MapStyle(map: MapboxMap) {private var map = map// Create a settings service instance as PERSISTENT,// the language set will be persisted across the application lifecycle.private val settingsService: SettingsService by lazy {SettingsServiceFactory.getInstance(SettingsServiceStorageType.PERSISTENT)}fun changeStyle(context: Context, style: String) {map.loadStyle(style) {if (style != Style.STANDARD && style != Style.STANDARD_SATELLITE) {it.localizeLabels(Locale.CHINESE)} else {val locale = context.resources.configuration.locales[0]// set language in bcp-47 tagval language = locale.toLanguageTag()settingsService.set(MapboxCommonSettings.LANGUAGE, Value(language))val worldView = "CN"settingsService.set(MapboxCommonSettings.WORLDVIEW, Value(worldView))}}}
}

运行效果图

3D基础	3D影像