Base module

app/app/src/main/java/de/haushalt/app/MainScreen.kt

@@ -1,7 +1,58 @@
 package de.haushalt.app
 
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.CenterAlignedTopAppBar
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import androidx.navigation.compose.NavHost
+import androidx.navigation.compose.composable
+import androidx.navigation.compose.rememberNavController
 
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun MainScreen() {
+    val navController = rememberNavController()
+    Scaffold(
+        topBar = {
+            Column {
+                Navigation()
+                Subnavigation()
+            }
+        }
+    ) { innerPadding ->
+        NavHost(
+            navController = navController,
+            startDestination = "start",
+            modifier = Modifier.padding(innerPadding)
+        ) {
+            composable("start") { StartScreen() }
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun Navigation() {
+    CenterAlignedTopAppBar(
+        title = { Text("Haushalt") }
+    )
+}
+
+@Composable
+private fun Subnavigation() {
+    Surface(
+        modifier = Modifier
+            .fillMaxWidth()
+            .height(32.dp),
+        color = MaterialTheme.colorScheme.surfaceVariant
+    ) {}
 }

app/app/src/main/java/de/haushalt/app/StartScreen.kt

@@ -0,0 +1,7 @@
+package de.haushalt.app
+
+import androidx.compose.runtime.Composable
+
+@Composable
+fun StartScreen() {
+}