$ git clone git@github.com:cbedoy/StateShopApp.git StateShopApp
$ cd StateShopApp
$ ./gradlew assembleDebugIt defines view controller or view
class ProductListFragment : StateiFragment(){
private val viewModel by inject<ProductListViewModel>()
override val title: String
get() = "Products"
...
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
with(binding.recyclerView){
adapter = productAdapter
layoutManager = GridLayoutManager(context, 2)
}...It represents states such display or defines events, like ShowLoader, HideLoader, ReloadInfo etc.
sealed class ProductListState {
object ShowLoader : ProductListState()
object HideLoader : ProductListState()
data class LoadedProducts(val productList: List<Product>) : ProductListState()
}It represents intents or actions than can trigger states, or communicate with another layers such UsesCases
sealed class ProductListIntent {
data class ChooseProductTypeIntent(val productType: ProductGenerator.ProductType): ProductListIntent()
data class AddProduct(val product: Product): ProductListIntent()
}Layers such contains all stuff related with Network service and local storage.
class ProductRepository(
private val service: ProductService
){
suspend fun requestProducts() = service.loadProducts()
}interface ProductService{
@GET("/lorem/images")
suspend fun loadProducts(): ProductListResponse()
}Layer such keep alive current states, it can emit states, and receive intents.
class ProductListViewModel(
private val orderUseCase: OrderUseCase
): ViewModel() {
private val _productListState = MutableStateFlow<ProductListState>(ProductListState.ShowLoader)
val productListState : StateFlow<ProductListState> get() = _productListState
fun handleIntent(intent: ProductListIntent){
when(intent){
is ProductListIntent.ChooseProductTypeIntent -> {
chooseItem(productType = intent.productType)
}
is ProductListIntent.AddProduct -> {
orderUseCase.addProduct(intent.product)
}
}...
}Layer such contains all bussiness logic.
class OrderUseCase {
private val currentOrder: Order = Order()
fun getCurrentOrder() = currentOrder.apply {
groupProducts.clear()
groupProducts.addAll(products.groupBy { it.name }.map {
ProductGroup(it.value)
})
}Example using flow:
- PreparingProducts: It can probably display a loader.
- Request Products, once you get product it continues
- Map one per one products and emit it
- Delay about 2000ms
- AllProductsAreDone: It can probably dismiss loader and show any fancy animation
class OrderUseCase {
private val currentOrder: Order = Order()
fun generateProductsWithDelay() = flow{
emit(PreparingProducts())
val products = repository.requestProducts()
products.map{
emit(PreparedItem(item = product.toItem))
}
delay(2000)
emit(AllProductsAreDone())
}Carlos Bedoy Contact
- Write MORE Tests
- Add Night Mode
MIT
Line by line, logic and syntax, my dreams explode