在Android SDK 30中，已经废弃了SharedPreferences存储，推荐使用Room Persistence Library来进行持久化值存储。

示例代码：

1. 首先，添加以下依赖到build.gradle文件中：

dependencies {
    def room_version = "2.2.6"
    implementation "androidx.room:room-runtime:$room_version"
    kapt "androidx.room:room-compiler:$room_version"
}

2. 创建数据库实体类和DAO接口：

@Entity
class User(
    @PrimaryKey val id: Int,
    val name: String,
    val age: Int
)

@Dao
interface UserDao {
    @Query("SELECT * FROM user")
    fun getAllUsers(): List

    @Insert
    fun insertUser(user: User)

    @Delete
    fun deleteUser(user: User)
}

@Database(entities = [User::class], version = 1)
abstract class AppDatabase : RoomDatabase() {
    abstract fun userDao(): UserDao
}

3. 初始化和使用数据库：

// 初始化数据库
val db = Room.databaseBuilder(
    applicationContext,
    AppDatabase::class.java, "database-name"
).build()

// 插入数据
val user = User(1, "John", 22)
db.userDao().insertUser(user)

// 查询数据
val users = db.userDao().getAllUsers()

// 删除数据
db.userDao().deleteUser(user)