tobioyelekan

class A(private val b: B) {
  b.doSomething()
}

class B {
  fun doSomething
}

tobioyelekan

class A {
  val b = B()
  b.doSomething()
}

class B {
  fun doSomething
}

tobioyelekan

class ApplicationClass : Application() {

    override fun onCreate() {
        super.onCreate()

        val constraint = Constraints.Builder()
            .setRequiredNetworkType(NetworkType.CONNECTED)
            .build()

        val workManager = WorkManager.getInstance(applicationContext)

tobioyelekan

@Database(
    entities = [User::class],
    version = 1,
    exportSchema = false
)
abstract class DatabaseClass : RoomDatabase() {
    abstract fun userDao(): UserDao
    companion object {
        private var instance: DatabaseClass? = null

tobioyelekan

@Dao
interface UserDao {
    @Query("SELECT * FROM user")
    fun getUsers(): LiveData<List<User>>

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    fun saveUsers(user: User)

    @Query("DELETE FROM user")
    fun deleteAll()

tobioyelekan

import androidx.room.Entity
import androidx.room.PrimaryKey

@Entity(tableName = "user")
data class User(
    @PrimaryKey
    val id: String,
    val firstName: String,
    val lastName: String
)

tobioyelekan

//ActivityViewModel.kt
private val _textToShow = MutableLiveData<String>()

val textToShow : LiveData<String>()
  get() = textToShow

fun buttonClicked(){
  _textToShow.value = "Hello"
}

tobioyelekan

class CourseAdapter(private val viewModel: CourseViewModel) :
    ListAdapter<Course, ViewHolder>(CourseDiffCallback()) {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val inflater = LayoutInflater.from(parent.context)
        return ViewHolder(inflater.inflate(R.layout.course_item, parent, false))
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.bind(viewModel, getItem(position))
    }

tobioyelekan

private val userId = MutableLiveData<String>()

    val userDetails = userId.switchMap {
        userRepo.getUser(it)
    }

    val userFullName = userDetails.map {
        getFullName(it.firstName, it.lastName)
    }