Add bottom navigation bar

.gitignore

@@ -1,14 +1,17 @@
 *.iml
 .gradle
 /local.properties
-/.idea/caches
+.idea/caches
-/.idea/libraries
+.idea/libraries
-/.idea/modules.xml
+.idea/modules.xml
-/.idea/workspace.xml
+.idea/workspace.xml
-/.idea/navEditor.xml
+.idea/navEditor.xml
-/.idea/assetWizardSettings.xml
+.idea/assetWizardSettings.xml
+.idea/deploymentTargetSelector.xml
+.kotlin
+
 .DS_Store
-/build
+build
 /captures
 .externalNativeBuild
 .cxx

.idea/deploymentTargetSelector.xml

@@ -4,7 +4,7 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
-        <DropdownSelection timestamp="2025-09-06T11:11:25.836349Z">
+        <DropdownSelection timestamp="2025-09-06T11:23:47.273402Z">
           <Target type="DEFAULT_BOOT">
             <handle>
               <DeviceId pluginId="LocalEmulator" identifier="path=/Users/denis0001-dev/.android/avd/Pixel_9_Pro_XL.avd" />

app/build.gradle.kts

@@ -52,6 +52,8 @@ dependencies {
     implementation(libs.androidx.ui.graphics)
     implementation(libs.androidx.ui.tooling.preview)
     implementation(libs.androidx.material3)
+    implementation(libs.androidx.navigation.compose)
+    implementation(libs.androidx.material.icons.extended)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)

app/src/main/java/ru/fromchat/MainActivity.kt

@@ -4,44 +4,14 @@ import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
-import androidx.compose.foundation.layout.fillMaxSize
+import ru.fromchat.ui.App
-import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.Scaffold
-import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.tooling.preview.Preview
-import ru.fromchat.ui.FromChatTheme
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         enableEdgeToEdge()
         setContent {
-            FromChatTheme {
+            App()
-                Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
-                    Greeting(
-                        name = "Android",
-                        modifier = Modifier.padding(innerPadding)
-                    )
-                }
-            }
         }
     }
 }
-
-@Composable
-fun Greeting(name: String, modifier: Modifier = Modifier) {
-    Text(
-        text = "Hello $name!",
-        modifier = modifier
-    )
-}
-
-@Preview(showBackground = true)
-@Composable
-fun GreetingPreview() {
-    FromChatTheme {
-        Greeting("Android")
-    }
-}

app/src/main/java/ru/fromchat/ui/App.kt

@@ -0,0 +1,102 @@
+package ru.fromchat.ui
+
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.Chat
+import androidx.compose.material.icons.automirrored.outlined.Chat
+import androidx.compose.material.icons.filled.Group
+import androidx.compose.material.icons.filled.Settings
+import androidx.compose.material.icons.outlined.Group
+import androidx.compose.material.icons.outlined.Settings
+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.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.navigation.compose.NavHost
+import androidx.navigation.compose.composable
+import androidx.navigation.compose.rememberNavController
+
+@Composable
+fun AppNavigationBar(selectedItem: Int, onSelectedItemChange: (Int) -> Unit) {
+    val items = listOf("Chats", "DMs", "Settings")
+    val selectedIcons = listOf(
+        Icons.Filled.Group,
+        Icons.AutoMirrored.Filled.Chat,
+        Icons.Filled.Settings
+    )
+    val unselectedIcons = listOf(
+        Icons.Outlined.Group,
+        Icons.AutoMirrored.Outlined.Chat,
+        Icons.Outlined.Settings
+    )
+
+    NavigationBar {
+        items.forEachIndexed { index, item ->
+            NavigationBarItem(
+                icon = {
+                    Icon(
+                        if (selectedItem == index) selectedIcons[index] else unselectedIcons[index],
+                        contentDescription = item,
+                    )
+                },
+                label = { Text(item) },
+                selected = selectedItem == index,
+                onClick = { onSelectedItemChange(index) },
+            )
+        }
+    }
+}
+
+@Composable
+fun App() {
+    FromChatTheme {
+        var selectedItem by remember { mutableIntStateOf(0) }
+        val navController = rememberNavController()
+
+        LaunchedEffect(selectedItem) {
+            navController.navigate(
+                when (selectedItem) {
+                    0 -> "chats"
+                    1 -> "dms"
+                    2 -> "settings"
+                    else -> error("")
+                }
+            )
+        }
+
+        Scaffold(
+            modifier = Modifier.fillMaxSize(),
+            bottomBar = {
+                AppNavigationBar(
+                    selectedItem = selectedItem,
+                    onSelectedItemChange = { selectedItem = it }
+                )
+            }
+        ) { innerPadding ->
+            NavHost(
+                navController = navController,
+                startDestination = "chats",
+                modifier = Modifier.padding(innerPadding)
+            ) {
+                composable("chats") {
+                    Text("Chats")
+                }
+                composable("dms") {
+                    Text("DMs")
+                }
+                composable("settings") {
+                    Text("Settings")
+                }
+            }
+        }
+    }
+}

gradle/libs.versions.toml

@@ -8,9 +8,12 @@ espressoCore = "3.7.0"
 lifecycleRuntimeKtx = "2.9.3"
 activityCompose = "1.10.1"
 composeBom = "2025.08.01"
+materialIconsExtended = "1.7.8"
+navigationCompose = "2.9.3"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+androidx-material-icons-extended = { module = "androidx.compose.material:material-icons-extended", version.ref = "materialIconsExtended" }
 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 +27,7 @@ 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-navigation-compose = { group = "androidx.navigation", name = "navigation-compose", version.ref = "navigationCompose" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }