Android Kotlin中的iOS Swift UserDefaults等价物

val sharedPreferences = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE)
val editor = sharedPreferences.edit()
editor.putString("key", "value")
editor.apply() // 或者 editor.commit()，但apply()是异步的且更高效

val sharedPreferences = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE)
val value = sharedPreferences.getString("key", "default_value")

val sharedPreferences = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE)
val editor = sharedPreferences.edit()
editor.remove("key")
editor.apply()

val sharedPreferences = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE)
val editor = sharedPreferences.edit()
editor.clear()
editor.apply()

fun SharedPreferences.put(key: String, value: Any?) {
    val editor = this.edit()
    when (value) {
        is String -> editor.putString(key, value)
        is Int -> editor.putInt(key, value)
        is Boolean -> editor.putBoolean(key, value)
        is Float -> editor.putFloat(key, value)
        is Long -> editor.putLong(key, value)
        is Set<*> -> editor.putStringSet(key, value as? Set<String>)
        null -> editor.remove(key)
    }.apply()
}

fun SharedPreferences.get(key: String, defaultValue: Any?): Any? {
    return when (defaultValue) {
        is String -> getString(key, defaultValue)
        is Int -> getInt(key, defaultValue as Int)
        is Boolean -> getBoolean(key, defaultValue as Boolean)
        is Float -> getFloat(key, defaultValue as Float)
        is Long -> getLong(key, defaultValue as Long)
        is Set<*> -> getStringSet(key, defaultValue as? Set<String>)
        null -> null
    }
}

val sharedPreferences = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE)
sharedPreferences.put("key", "value")
val value = sharedPreferences.get<String>("key", "default_value")