How to know whether use metric or imperial

问题

How could I know in android whether to use metric or imperial? I haven't seen any option in Locale, and the only thing that comes to my mind is to use the locale.getCountry(); method and check whether the country is UK, US, ... But, is there an android's method to know it?

Thanks in advance!

回答1:

A more or less complete way to do this is this way:

Kotlin:

private fun Locale.toUnitSystem() =
    when (country.toUpperCase()) {
        // https://en.wikipedia.org/wiki/United_States_customary_units
        // https://en.wikipedia.org/wiki/Imperial_units
        "US" -> UnitSystem.IMPERIAL_US
        // UK, Myanmar, Liberia, 
        "GB", "MM", "LR" -> UnitSystem.IMPERIAL
        else -> UnitSystem.METRIC
    }

Note that there is a difference between UK and US imperial systems, see the wiki articles for more details.

来源：https://stackoverflow.com/questions/36065049/how-to-know-whether-use-metric-or-imperial