basic 2 screen setup

.idea/gradle.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>

app/build.gradle.kts

@@ -5,12 +5,12 @@ plugins {
 
 android {
     namespace = "at.xaxa.demonstrator2"
-    compileSdk = 34
+    compileSdk = 35
 
     defaultConfig {
         applicationId = "at.xaxa.demonstrator2"
         minSdk = 24
-        targetSdk = 34
+        targetSdk = 35
         versionCode = 1
         versionName = "1.0"
 
@@ -50,6 +50,8 @@ android {
 }
 
 dependencies {
+    implementation(libs.androidx.navigation.compose)
+    implementation(libs.androidx.material)
 
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.lifecycle.runtime.ktx)
@@ -59,6 +61,7 @@ dependencies {
     implementation(libs.androidx.ui.graphics)
     implementation(libs.androidx.ui.tooling.preview)
     implementation(libs.androidx.material3)
+    implementation(libs.androidx.legacy.support.v4)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)

app/src/main/java/at/xaxa/demonstrator2/MainActivity.kt

@@ -4,13 +4,26 @@ import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Favorite
+import androidx.compose.material.icons.filled.Home
+import androidx.compose.material3.Icon
+import androidx.compose.material3.NavigationBar
+import androidx.compose.material3.NavigationBarItem
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.tooling.preview.Preview
+import androidx.navigation.compose.NavHost
+import androidx.navigation.compose.composable
+import androidx.navigation.compose.currentBackStackEntryAsState
+import androidx.navigation.compose.rememberNavController
 import at.xaxa.demonstrator2.ui.theme.Demonstrator2Theme
 
 class MainActivity : ComponentActivity() {
@@ -19,12 +32,7 @@ class MainActivity : ComponentActivity() {
         enableEdgeToEdge()
         setContent {
             Demonstrator2Theme {
-                Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
+                NavigationBar()
-                    Greeting(
-                        name = "Android",
-                        modifier = Modifier.padding(innerPadding)
-                    )
-                }
             }
         }
     }
@@ -44,4 +52,51 @@ fun GreetingPreview() {
     Demonstrator2Theme {
         Greeting("Android")
     }
+}
+
+@Composable
+fun NavigationBar() {
+    val navController = rememberNavController()
+
+    Scaffold(
+        bottomBar = {
+            NavigationBar {
+                NavigationBarItem(
+                    icon = { Icon(Icons.Default.Home, contentDescription = "Home") },
+                    label = { Text("Home") },
+                    selected = navController.currentBackStackEntryAsState().value?.destination?.route == "home",
+                    onClick = { navController.navigate("home") }
+                )
+                NavigationBarItem(
+                    icon = { Icon(Icons.Default.Favorite, contentDescription = "Favorites") },
+                    label = { Text("Favorites") },
+                    selected = navController.currentBackStackEntryAsState().value?.destination?.route == "favorites",
+                    onClick = { navController.navigate("favorites") }
+                )
+            }
+        }
+    ) { innerPadding ->
+        NavHost(
+            navController = navController,
+            startDestination = "home",
+            modifier = Modifier.padding(innerPadding)
+        ) {
+            composable("home") { HomeScreen() }
+            composable("favorites") { FavoritesScreen() }
+        }
+    }
+}
+
+@Composable
+fun HomeScreen() {
+    Box(Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+        Text("Home Screen")
+    }
+}
+
+@Composable
+fun FavoritesScreen() {
+    Box(Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+        Text("Favorites Screen")
+    }
 }

gradle/libs.versions.toml

@@ -8,9 +8,17 @@ espressoCore = "3.6.1"
 lifecycleRuntimeKtx = "2.8.7"
 activityCompose = "1.9.3"
 composeBom = "2024.04.01"
+legacySupportV4 = "1.0.0"
+material = "1.7.5"
+material3 = "1.2.0"
+navigationCompose = "2.8.4"
+navigationComposeVersion = "2.7.2"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+androidx-material = { module = "androidx.compose.material:material", version.ref = "material" }
+androidx-navigation-compose = { module = "androidx.navigation:navigation-compose", version.ref = "navigationCompose" }
+androidx-navigation-compose-v272 = { module = "androidx.navigation:navigation-compose", version.ref = "navigationComposeVersion" }
 junit = { group = "junit", name = "junit", version.ref = "junit" }
 androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
 androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
@@ -24,6 +32,8 @@ androidx-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-toolin
 androidx-ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-manifest" }
 androidx-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4" }
 androidx-material3 = { group = "androidx.compose.material3", name = "material3" }
+androidx-legacy-support-v4 = { group = "androidx.legacy", name = "legacy-support-v4", version.ref = "legacySupportV4" }
+material3 = { module = "androidx.compose.material3:material3", version.ref = "material3" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }