最好的方法是生成一个随机数,然后访问列表中的特定数字

val random = Random() 
tips.entries.elementAt(random.nextInt(tips.size))

您还可以执行以下操作(不推荐):

tips.entries.shuffled().first()

注:

导入kotlin。集合。洗牌

使用扩展函数

val tips = hashMapOf("Having a balanced diet is the key" to "Have nutritious foods like vegetables and fruits along with legumes, whole wheat, cereals etc."
        , "Fluids will help you manage" to "Drink sufficient water and fluids to maintain the retention of water in your body."
        , "Do not miss prenatal supplements" to "Doctors prescribe prenatal vitamin and mineral supplements for the normal growth and development."
        , "Folic acid is essential" to "During pregnancy, have folic acid (supplement) or folate (natural source of folic acid) to avoid various health problems.")

val random = Random()

fun <T,U> Map<T,U>.random(): Map.Entry<T,U> = entries.elementAt(random.nextInt(size))

fun main(args: Array<String>) {
    println(tips.random())
}

这适用于任何地图类型,即使项目已添加到地图中。