用官方的方法一直不成功，发现还有一种替代方案，就是使用官方的本地化插件。
https://docs.mapbox.com/android/plugins/overview/localization/
依赖
implementation 'com.mapbox.mapboxsdk:mapbox-android-plugin-localization-v9:0.12.0'
代码
mapView.getMapAsync { mapboxMap ->
mapboxMap.setStyle(Style.MAPBOX_STREETS) { style ->
val localizationPlugin = LocalizationPlugin(mapView, mapboxMap, style)
try {
localizationPlugin.matchMapLanguageWithDeviceDefault()
} catch (exception: RuntimeException) {
Log.d("MainActivity", exception.toString())
}
}
}
