1. 示例图

2.具体实现

如何实现上述示例，且不需要重新打开App

①自定义 MainApplication  实现 Application ，定义两个变量：

class MainApplication : Application() {     object GlobalDpData {    var language: String = ""    var defaultLanguage: String = "en"
    }
    override fun onCreate() {defaultLanguage = Locale.getDefault().language 
        val cacheLanguage = "保存在手机App本地的切换后的语言，可用sp或文件实现" language = if (cacheLanguage.isNullOrEmpty()) { 
            defaultLanguage 
        } else  { 
            cacheLanguage 
        }}
}

②在baseActivity中添加语言实现

override fun attachBaseContext(baseContext: Context) {var language = MainApplication.GlobalDpData.languageif (language.isEmpty()) {val default = MainApplication.GlobalDpData.defaultLanguagelanguage = "保存在手机App本地的切换后的语言，可用sp或文件实现" }// 创建一个ContextWrapper对象val context = newWrap(baseContext, language)// 将新的的Context设置给Activitysuper.attachBaseContext(context)
}

/***  创建ContextWrapper对象，*/
private fun newWrap(context: Context, language: String): ContextWrapper {val configuration = context.resources.configurationconfiguration.fontScale = 1fval locale = Locale(language)val localeList = LocaleList(locale)LocaleList.setDefault(localeList)configuration.setLocales(localeList)