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August 15, 2024 02:35
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An example of using Use Case interfaces without backing Use Case classes
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| package com.example.counterapplication | |
| import android.app.Application | |
| import android.os.Bundle | |
| import androidx.activity.ComponentActivity | |
| import androidx.activity.compose.setContent | |
| import androidx.activity.enableEdgeToEdge | |
| import androidx.activity.viewModels | |
| import androidx.compose.foundation.layout.Arrangement | |
| import androidx.compose.foundation.layout.Column | |
| import androidx.compose.foundation.layout.Row | |
| import androidx.compose.foundation.layout.fillMaxSize | |
| import androidx.compose.foundation.layout.padding | |
| import androidx.compose.material3.Button | |
| import androidx.compose.material3.Scaffold | |
| import androidx.compose.material3.Text | |
| import androidx.compose.runtime.Composable | |
| import androidx.compose.runtime.collectAsState | |
| import androidx.compose.runtime.getValue | |
| import androidx.compose.ui.Modifier | |
| import androidx.lifecycle.ViewModel | |
| import dagger.Binds | |
| import dagger.Module | |
| import dagger.hilt.InstallIn | |
| import dagger.hilt.android.AndroidEntryPoint | |
| import dagger.hilt.android.HiltAndroidApp | |
| import dagger.hilt.android.lifecycle.HiltViewModel | |
| import dagger.hilt.components.SingletonComponent | |
| import kotlinx.coroutines.flow.MutableStateFlow | |
| import kotlinx.coroutines.flow.StateFlow | |
| import kotlinx.coroutines.flow.update | |
| import javax.inject.Inject | |
| import javax.inject.Singleton | |
| @HiltAndroidApp | |
| class MyApp: Application() | |
| @AndroidEntryPoint | |
| class MainActivity : ComponentActivity() { | |
| private val viewModel by viewModels<CounterViewModel>() | |
| override fun onCreate(savedInstanceState: Bundle?) { | |
| super.onCreate(savedInstanceState) | |
| setContent { | |
| Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding -> | |
| CounterScreen(viewModel = viewModel, modifier = Modifier.padding(innerPadding)) | |
| } | |
| } | |
| } | |
| } | |
| @Composable | |
| fun CounterScreen(viewModel: CounterViewModel, modifier: Modifier = Modifier) { | |
| val state by viewModel.value.collectAsState() | |
| Column(modifier = modifier) { | |
| Text(text = state.toString()) | |
| Row(horizontalArrangement = Arrangement.SpaceBetween) { | |
| Button(onClick = { viewModel.postAction(CounterViewModel.Action.ADD_ONE)}) { | |
| Text("Add One") | |
| } | |
| Button(onClick = { viewModel.postAction(CounterViewModel.Action.SUBTRACT_ONE)}) { | |
| Text("Subtract One") | |
| } | |
| } | |
| } | |
| } | |
| @HiltViewModel | |
| class CounterViewModel @Inject constructor( | |
| private val addOne: AddOne, | |
| private val subtractOne: SubtractOne, | |
| subscribeValue: SubscribeValue | |
| ): ViewModel() { | |
| val value = subscribeValue.value | |
| fun postAction(action: Action) { | |
| when(action) { | |
| Action.ADD_ONE -> addOne() | |
| Action.SUBTRACT_ONE -> subtractOne() | |
| } | |
| } | |
| enum class Action { | |
| ADD_ONE, SUBTRACT_ONE | |
| } | |
| } | |
| interface AddOne { | |
| fun addOne() | |
| } | |
| operator fun AddOne.invoke() { | |
| addOne() | |
| } | |
| interface SubtractOne { | |
| fun subtractOne() | |
| } | |
| operator fun SubtractOne.invoke() { | |
| subtractOne() | |
| } | |
| interface SubscribeValue { | |
| val value: StateFlow<Int> | |
| } | |
| @Singleton | |
| class ValueRepository @Inject constructor(): AddOne, SubtractOne, SubscribeValue { | |
| override fun subtractOne() { | |
| _value.update { it - 1 } | |
| } | |
| override fun addOne() { | |
| _value.update { it + 1 } | |
| } | |
| private val _value = MutableStateFlow(0) | |
| override val value: StateFlow<Int> = _value | |
| } | |
| @Module | |
| @InstallIn(SingletonComponent::class) | |
| abstract class CounterModule { | |
| @Binds | |
| abstract fun bindAdd(valueRepository: ValueRepository): AddOne | |
| @Binds | |
| abstract fun bindSubtract(valueRepository: ValueRepository): SubtractOne | |
| @Binds | |
| abstract fun bindSubscribeValue(valueRepository: ValueRepository): SubscribeValue | |
| } |
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