feat: add bluetooth service and viewmodel

app/src/main/AndroidManifest.xml

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
 
     <application
         android:allowBackup="true"

app/src/main/java/com/example/tvcontroller/BluetoothService.kt

@@ -0,0 +1,29 @@
+package com.example.tvcontroller
+
+import android.bluetooth.BluetoothAdapter
+import android.bluetooth.BluetoothManager
+import android.content.Context
+import android.content.Intent
+import android.app.Activity
+import androidx.activity.result.ActivityResultLauncher
+import androidx.core.app.ComponentActivity
+import androidx.core.content.ContextCompat.getSystemService
+
+object BluetoothService {
+    private lateinit var bluetoothManager: BluetoothManager;
+    private var bluetoothAdapter: BluetoothAdapter? = null;
+
+    fun init(context: Context) {
+        bluetoothManager = getSystemService(context, BluetoothManager::class.java)!!
+        bluetoothAdapter = bluetoothManager.adapter
+
+        if (bluetoothAdapter == null) {
+            throw Exception("Bluetooth not supported on this device")
+        }
+    }
+
+    fun isEnabled(): Boolean {
+        return bluetoothAdapter?.isEnabled?: false
+    }
+
+}

app/src/main/java/com/example/tvcontroller/MainActivity.kt

@@ -1,20 +1,23 @@
 package com.example.tvcontroller
 
+import android.content.ContentValues.TAG
 import android.os.Bundle
+import android.util.Log
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.compose.foundation.layout.Arrangement
 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.material3.Button
-import androidx.compose.material.icons.filled.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.collectAsState
 import androidx.compose.ui.Modifier
 import androidx.navigation.NavHostController
 import androidx.navigation.compose.NavHost
@@ -23,12 +26,16 @@ import androidx.navigation.compose.currentBackStackEntryAsState
 import androidx.navigation.compose.rememberNavController
 import com.example.tvcontroller.ui.theme.TVControllerTheme
 import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.res.painterResource
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.example.tvcontroller.ui.AppViewModel
 
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        BluetoothService.init(this)
         enableEdgeToEdge()
         setContent {
             TVControllerTheme {
@@ -40,17 +47,19 @@ class MainActivity : ComponentActivity() {
 
 @Composable
 fun TvControllerApp(
-    navController: NavHostController = rememberNavController()
+    navController: NavHostController = rememberNavController(),
+    appViewModel: AppViewModel = viewModel()
 ) {
+    val appUiState by appViewModel.uiState.collectAsState();
     val backStackEntry by navController.currentBackStackEntryAsState()
-    val currentScreen = Screens.valueOf(backStackEntry?.destination?.route ?: Screens.Camera.name)
+    val currentScreen = Screen.valueOf(backStackEntry?.destination?.route ?: Screen.Camera.name)
     val baselineCamera24 = painterResource(R.drawable.baseline_camera_24)
     val baselineRemote24 = painterResource(R.drawable.baseline_settings_remote_24)
     val baselineSettings24 = painterResource(R.drawable.baseline_settings_24)
     Scaffold(modifier = Modifier.fillMaxSize(), bottomBar = {
         NavigationBar {
             NavigationBarItem(
-                onClick = { navController.navigate(Screens.Camera.name) },
+                onClick = { navController.navigate(Screen.Camera.name) },
                 icon = {
                     Icon(
                         baselineCamera24,
@@ -58,10 +67,10 @@ fun TvControllerApp(
                     )
                 },
                 label = { Text("Camera") },
-                selected = currentScreen == Screens.Camera
+                selected = currentScreen == Screen.Camera
             )
             NavigationBarItem(
-                onClick = { navController.navigate(Screens.Remote.name) },
+                onClick = { navController.navigate(Screen.Remote.name) },
                 icon = {
                     Icon(
                         baselineRemote24,
@@ -69,10 +78,10 @@ fun TvControllerApp(
                     )
                 },
                 label = { Text("Remote") },
-                selected = currentScreen == Screens.Remote
+                selected = currentScreen == Screen.Remote
             )
             NavigationBarItem(
-                onClick = { navController.navigate(Screens.Settings.name) },
+                onClick = { navController.navigate(Screen.Settings.name) },
                 icon = {
                     Icon(
                         baselineSettings24,
@@ -80,23 +89,23 @@ fun TvControllerApp(
                     )
                 },
                 label = { Text("Settings") },
-                selected = currentScreen == Screens.Settings
+                selected = currentScreen == Screen.Settings
             )
         }
     }) { innerPadding ->
         Column {
             NavHost(
                 navController = navController,
-                startDestination = Screens.Camera.name,
+                startDestination = Screen.Camera.name,
                 modifier = Modifier.padding(innerPadding)
             ) {
-                composable(route = Screens.Camera.name) {
+                composable(route = Screen.Camera.name) {
                     CameraScreen()
                 }
-                composable(route = Screens.Remote.name) {
+                composable(route = Screen.Remote.name) {
                     RemoteScreen()
                 }
-                composable(route = Screens.Settings.name) {
+                composable(route = Screen.Settings.name) {
                     SettingsScreen()
                 }
             }
@@ -106,15 +115,39 @@ fun TvControllerApp(
 
 @Composable
 fun CameraScreen(modifier: Modifier = Modifier) {
+    Column(
+        modifier = modifier
+            .fillMaxSize(),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center
+    ) {
         Text(text = "Camera Screen", modifier = modifier)
+    }
 }
 
 @Composable
 fun RemoteScreen(modifier: Modifier = Modifier) {
+    Column(
+        modifier = modifier
+            .fillMaxSize(),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center
+    ) {
         Text(text = "Remote Screen", modifier = modifier)
+        Button(onClick = { Log.i(TAG, "RemoteScreen: Button clicked") }) {
+            Text(text = "Button")
+        }
+    }
 }
 
 @Composable
 fun SettingsScreen(modifier: Modifier = Modifier) {
+    Column(
+        modifier = modifier
+            .fillMaxSize(),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center
+    ) {
         Text(text = "Settings Screen", modifier = modifier)
+    }
 }

app/src/main/java/com/example/tvcontroller/Screen.kt

@@ -1,6 +1,6 @@
 package com.example.tvcontroller
 
-enum class Screens {
+enum class Screen {
     Camera,
     Remote,
     Settings

app/src/main/java/com/example/tvcontroller/ui/AppUiState.kt

@@ -0,0 +1,7 @@
+package com.example.tvcontroller.ui
+
+import com.example.tvcontroller.Screen
+
+data class AppUiState(
+    val currentScreen: Screen = Screen.Camera,
+)

app/src/main/java/com/example/tvcontroller/ui/AppViewModel.kt

@@ -0,0 +1,19 @@
+package com.example.tvcontroller.ui
+
+import androidx.lifecycle.ViewModel
+import com.example.tvcontroller.Screen
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+
+class AppViewModel : ViewModel() {
+    private val _uiState = MutableStateFlow(AppUiState())
+    val uiState: StateFlow<AppUiState> = _uiState.asStateFlow()
+
+    fun updateScreen(screen: Screen) {
+        if (uiState.value.currentScreen == screen) return
+        val newUiState = uiState.value.copy(currentScreen = screen)
+        _uiState.update { newUiState }
+    }
+}