Update project

app/src/main/kotlin/org/michaelbel/template/App.kt

@@ -1,5 +1,16 @@
 package org.michaelbel.template
 
 import android.app.Application
+import org.koin.android.ext.koin.androidContext
+import org.koin.core.context.startKoin
 
-class App: Application()
+class App: Application() {
+
+    override fun onCreate() {
+        super.onCreate()
+        startKoin {
+            androidContext(this@App)
+            modules(appModule)
+        }
+    }
+}

app/src/main/kotlin/org/michaelbel/template/AppModule.kt

@@ -0,0 +1,19 @@
+package org.michaelbel.template
+
+import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import okio.Path.Companion.toPath
+import org.koin.android.ext.koin.androidContext
+import org.koin.androidx.viewmodel.dsl.viewModelOf
+import org.koin.dsl.module
+import org.michaelbel.template.datastore.AppPreferences
+
+val appModule = module {
+    single<AppPreferences> {
+        val dataStore = PreferenceDataStoreFactory.createWithPath(
+            migrations = emptyList(),
+            produceFile = { androidContext().filesDir.resolve(AppPreferences.DATA_STORE_NAME).absolutePath.toPath() }
+        )
+        AppPreferences(dataStore)
+    }
+    viewModelOf(::MainViewModel)
+}

app/src/main/kotlin/org/michaelbel/template/MainActivity.kt

@@ -5,6 +5,7 @@ import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
+import org.michaelbel.template.ui.MainActivityContent
 
 class MainActivity: AppCompatActivity() {
 

app/src/main/kotlin/org/michaelbel/template/MainViewModel.kt

@@ -0,0 +1,8 @@
+package org.michaelbel.template
+
+import org.michaelbel.core.viewmodel.BaseViewModel
+import org.michaelbel.template.datastore.AppPreferences
+
+class MainViewModel(
+    private val appPreferences: AppPreferences
+): BaseViewModel()

app/src/main/kotlin/org/michaelbel/template/datastore/AppPreferences.kt

@@ -0,0 +1,43 @@
+package org.michaelbel.template.datastore
+
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.core.stringPreferencesKey
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.map
+
+class AppPreferences(
+    private val dataStore: DataStore<Preferences>
+) {
+    val usernameFlow: Flow<String?>
+        get() = dataStore.data.map { preferences -> preferences[PREFERENCE_USERNAME_KEY] }
+
+    suspend fun username(): String {
+        return dataStore.data.first()[PREFERENCE_USERNAME_KEY].orEmpty()
+    }
+
+    suspend fun <T> setValue(key: PreferenceKey<T>, value: T) {
+        dataStore.edit { preferences ->
+            preferences[key.preferenceKey] = value
+        }
+    }
+
+    suspend fun <T> removeValue(key: PreferenceKey<T>) {
+        dataStore.edit { preferences ->
+            preferences.remove(key.preferenceKey)
+        }
+    }
+
+    companion object {
+        const val DATA_STORE_NAME = "app.preferences_pb"
+        private val PREFERENCE_USERNAME_KEY = stringPreferencesKey("username")
+    }
+
+    sealed class PreferenceKey<T>(
+        val preferenceKey: Preferences.Key<T>
+    ) {
+        data object PreferenceUsernameKey: PreferenceKey<String>(PREFERENCE_USERNAME_KEY)
+    }
+}

app/src/main/kotlin/org/michaelbel/template/MainActivityContent.kt → app/src/main/kotlin/org/michaelbel/template/ui/MainActivityContent.kt

@@ -1,6 +1,6 @@
 @file:OptIn(ExperimentalMaterial3Api::class)
 
-package org.michaelbel.template
+package org.michaelbel.template.ui
 
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.fadeIn
@@ -46,10 +46,12 @@ import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.rememberNavController
 import kotlinx.coroutines.launch
-import org.michaelbel.template.ui.AppTheme
+import org.koin.androidx.compose.koinViewModel
+import org.michaelbel.template.MainViewModel
 
 @Composable
 fun MainActivityContent(
+    viewModel: MainViewModel = koinViewModel(),
     modifier: Modifier = Modifier
 ) {
     val navHostController = rememberNavController()

core/build.gradle.kts

@@ -48,7 +48,9 @@ dependencies {
     api(libs.androidx.compose.ui.tooling)
     api(libs.androidx.core.ktx)
     api(libs.androidx.core.splashscreen)
+    api(libs.androidx.datastore.preferences)
     api(libs.androidx.lifecycle.viewmodel.compose)
     api(libs.androidx.navigation.compose)
     api(libs.androidx.paging.compose)
+    api(libs.koin.androidx.compose)
 }