The document discusses Android architecture components. It describes key components like Lifecycles, LiveData, ViewModel, Room, Navigation, Paging, ViewModel SavedState, and Data Binding. It also discusses using architecture components with the MVVM pattern and clean architecture, including layers for the data, presentation and domain. It provides examples of implementing use cases and repositories, and testing use cases. It emphasizes benefits like testable and collaborative code and outlines best practices like proof of concepts for new learning.

1. Architecture Components
In Real Life
Season 2
@akexorcist
Lovely Android Developer @ Nextzy

3. Architecture
Component
• Lifecycles
• LiveData
• ViewModel
• Room

4. Architecture
Component
• Lifecycles
• LiveData
• ViewModel
• Room
• Navigation
• Paging
• ViewModel SavedState
• Data Binding

5. Dialog Event Listener
Use case

7. Activity/Fragment
DialogFragment
Normal
CreateEvent Listener

8. Activity/Fragment
DialogFragment
Activity destroyed then restored
CreateEvent Listener

9. Activity/Fragment DialogFragment
Handle dialog event with view model
ViewModel

10. Activity/Fragment DialogFragment
Handle dialog event with view model
ViewModel
Create

11. Activity/Fragment DialogFragment
Handle dialog event with view model
ViewModel
Event Listener Event Listener

12. Activity/Fragment DialogFragment
Handle dialog event with view model
Mapper
Event Listener Event Listener
ViewModel
LiveDataLiveData

13. DialogManager.showConfirm(
message = message,
key = KEY_DELETE_CONFIRMATION,
fragmentManager = supportFragmentManager
)

14. dialogViewModel.confirmation.observe(this, object : ConfirmDialogListener {
override fun onConfirmButtonClick(key: String?, data: Bundle?) {
when (key) {
KEY_DELETE_CONFIRMATION -> deleteTask(true)
}
}
override fun onCancelButtonClick(key: String?, data: Bundle?) {
}
})

15. MVVM + Clean Architecture
With Architecture Components

16. Reason
• Able to write the testable code
• Suitable for write the code with others

17. Activity/Fragment
ViewModel
Repository
Database Network

18. Activity/Fragment
ViewModel
UseCase
Database Network
Repository

19. Data Layer
Presentation Layer
Domain Layer
Activity/Fragment
ViewModel
UseCase
Database Network
Repository

20. Activity/Fragment
ViewModel
UseCase
Database Network
Repository
UseCaseUseCase

21. LiveDataLiveDataLiveData
LiveData
Activity/Fragment
ViewModel
UseCase
Database Network
Repository
UseCaseUseCase

22. class ValidateUsernameUseCase : UseCase<String?, Boolean>() {
override fun execute(parameters: String?): Boolean {
return parameters?.isNotEmpty() ?: false
}
}

23. class ValidateUsernameUseCase : UseCase<String?, Boolean>() {
override fun execute(parameters: String?): Boolean {
return parameters?.isNotEmpty() ?: false
}
}

24. class ValidateUsernameUseCase : UseCase<String?, Boolean>() {
override fun execute(parameters: String?): Boolean {
return parameters?.isNotEmpty() ?: false
}
}

25. class ValidateUsernameUseCase : UseCase<String?, Boolean>() {
override fun execute(parameters: String?): Boolean {
return parameters?.isNotEmpty() ?: false
}
}

26. class GetProfileUseCase constructor(
private val repository: ProfileRepository
) : MediatorUseCase<GetProfileRequest, String?>() {
override fun execute(parameters: GetProfileRequest) {
result.addSource(repository.getTermCondition(parameters)) { response ->
result.postValue(response)
}
}
}

27. class GetProfileUseCase constructor(
private val repository: ProfileRepository
) : MediatorUseCase<GetProfileRequest, String?>() {
override fun execute(parameters: GetProfileRequest) {
result.addSource(repository.getTermCondition(parameters)) { response ->
result.postValue(response)
}
}
}

28. class GetProfileUseCase constructor(
private val repository: ProfileRepository
) : MediatorUseCase<GetProfileRequest, String?>() {
override fun execute(parameters: GetProfileRequest) {
result.addSource(repository.getTermCondition(parameters)) { response ->
result.postValue(response)
}
}
}

29. class GetProfileUseCase constructor(
private val repository: ProfileRepository
) : MediatorUseCase<GetProfileRequest, String?>() {
override fun execute(parameters: GetProfileRequest) {
result.addSource(repository.getTermCondition(parameters)) { response ->
result.postValue(response)
}
}
}

30. class ValidateUsernameUseCase : UseCase<String?, Boolean>() {
override fun execute(parameters: String?): Boolean {
return parameters?.isNotEmpty() ?: false
}
}
class GetProfileUseCase constructor(
private val repository: ProfileRepository
) : MediatorUseCase<GetProfileRequest, String?>() {
override fun execute(parameters: GetProfileRequest) {
result.addSource(repository.getTermCondition(parameters)) { response ->
result.postValue(response)
}
}
}
Synchronous Logic
Asynchronous Logic

31. LiveDataLiveDataLiveData
LiveData
Activity/Fragment
ViewModel
UseCase
Database Network
Repository
UseCaseUseCase

32. class ValidateUsernameUseCaseTest {
@Before
fun setup() {
MockitoAnnotations.initMocks(this)
}
@Test
fun `Validate the username with normally username - should be true`() {
val useCase = ValidateUsernameUseCase()
val username = "Akexorcist"
val result = useCase.executeNow(username)
Assert.assertTrue(result is Result.Success)
Assert.assertTrue((result as Result.Success).data ?: false)
}
@Test
fun `Validate the username with empty username - should be false`() {
val useCase = ValidateUsernameUseCase()
val username = ""

33. class ValidateUsernameUseCaseTest {
@Before
fun setup() {
MockitoAnnotations.initMocks(this)
}
@Test
fun `Validate the username with normally username - should be true`() {
val useCase = ValidateUsernameUseCase()
val username = "Akexorcist"
val result = useCase.executeNow(username)
Assert.assertTrue(result is Result.Success)
Assert.assertTrue((result as Result.Success).data ?: false)
}
@Test
fun `Validate the username with empty username - should be false`() {
val useCase = ValidateUsernameUseCase()
val username = ""

34. Activity/Fragment
ViewModel
UseCase
Database Network
Repository
UseCaseUseCase

35. Activity/Fragment
ViewModel
UseCase
Database Network
Repository
UseCaseUseCase
Data Layer
Presentation Layer
Domain Layer

36. Activity/Fragment
ViewModel
UseCase
Database Network
Repository
UseCaseUseCase
Developer A
Developer B

37. Activity/Fragment
ViewModel
UseCase
Database Network
Repository
UseCaseUseCase
Developer A
Developer B

38. Activity/Fragment
ViewModel
UseCase
Database Network
Repository
UseCaseUseCase
Developer A
Developer B

39. Activity/Fragment
ViewModel
UseCase
Database Network
Repository
Data Layer
Presentation Layer
Domain Layer
Navigation
Data Binding
ViewModel SavedState
Coroutine

40. Activity/Fragment
Paging
Data Layer
Presentation Layer
Domain Layer

41. Do the
Proof of Concept
every time when you learn
something new

42. Thank you!
@akexorcist
Lovely Android Developer @ Nextzy