Initialize the basic framework

app/src/main/kotlin/top/fatweb/oxygen/toolbox/MainActivityViewModel.kt

@@ -0,0 +1,31 @@
+package top.fatweb.oxygen.toolbox
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.stateIn
+import top.fatweb.oxygen.toolbox.model.UserData
+import top.fatweb.oxygen.toolbox.repository.UserDataRepository
+import javax.inject.Inject
+import kotlin.time.Duration.Companion.seconds
+
+@HiltViewModel
+class MainActivityViewModel @Inject constructor(
+    userDataRepository: UserDataRepository
+) : ViewModel() {
+    val uiState: StateFlow<MainActivityUiState> = userDataRepository.userData.map {
+        MainActivityUiState.Success(it)
+    }.stateIn(
+        scope = viewModelScope,
+        initialValue = MainActivityUiState.Loading,
+        started = SharingStarted.WhileSubscribed(5.seconds.inWholeMilliseconds)
+    )
+}
+
+sealed interface MainActivityUiState {
+    data object Loading : MainActivityUiState
+    data class Success(val userData: UserData) : MainActivityUiState
+}