feat: add persisting of settings

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

@@ -31,11 +31,13 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.res.painterResource
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.example.tvcontroller.services.BluetoothService
+import com.example.tvcontroller.services.DeviceService
 import com.example.tvcontroller.ui.AppViewModel
 
 
 class MainActivity : ComponentActivity() {
     private lateinit var bluetoothService: BluetoothService
+    private lateinit var deviceService: DeviceService
     private val appViewModel by viewModels<AppViewModel>()
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -43,10 +45,15 @@ class MainActivity : ComponentActivity() {
         bluetoothService = BluetoothService(this.applicationContext)
         bluetoothService.onBluetoothStateChanged { state -> appViewModel.setBluetoothEnabled(state == BluetoothAdapter.STATE_ON) }
         appViewModel.setBluetoothEnabled(bluetoothService.isBluetoothEnabled())
+        deviceService = DeviceService(this.applicationContext)
         enableEdgeToEdge()
         setContent {
             TVControllerTheme {
-                TvControllerApp(appViewModel = appViewModel, bluetoothService = bluetoothService)
+                TvControllerApp(
+                    appViewModel = appViewModel,
+                    bluetoothService = bluetoothService,
+                    deviceService = deviceService
+                )
             }
         }
     }
@@ -56,7 +63,8 @@ class MainActivity : ComponentActivity() {
 fun TvControllerApp(
     navController: NavHostController = rememberNavController(),
     appViewModel: AppViewModel = viewModel(),
-    bluetoothService: BluetoothService? = null
+    bluetoothService: BluetoothService? = null,
+    deviceService: DeviceService
 ) {
     val backStackEntry by navController.currentBackStackEntryAsState()
     val currentScreen = Screen.valueOf(backStackEntry?.destination?.route ?: Screen.Camera.name)
@@ -113,7 +121,7 @@ fun TvControllerApp(
                     RemoteScreen()
                 }
                 composable(route = Screen.Settings.name) {
-                    SettingsScreen(appViewModel = appViewModel)
+                    SettingsScreen(appViewModel = appViewModel, deviceService = deviceService)
                 }
             }
         }

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

@@ -16,11 +16,13 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
+import com.example.tvcontroller.services.DeviceService
 import com.example.tvcontroller.ui.AppViewModel
 
 @Composable
-fun SettingsScreen(appViewModel: AppViewModel = viewModel()) {
+fun SettingsScreen(deviceService: DeviceService, appViewModel: AppViewModel) {
-    val viewModel = viewModel<SettingsViewModel>()
+    val viewModel =
+        viewModel<SettingsViewModel>(factory = SettingsViewModel.provideFactory(deviceService))
 
     Column(
         modifier = Modifier

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

@@ -4,12 +4,13 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.setValue
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.viewModelScope
 import com.example.tvcontroller.services.DeviceService
 import kotlinx.coroutines.launch
 
-class SettingsViewModel : ViewModel() {
+class SettingsViewModel(private val deviceService: DeviceService) : ViewModel() {
-    var serverAddress by mutableStateOf(DeviceService.getServerAddress())
+    var serverAddress by mutableStateOf(deviceService.getServerAddress())
         private set
     var deviceName by mutableStateOf(android.os.Build.MANUFACTURER + " " + android.os.Build.MODEL)
         private set
@@ -19,8 +20,8 @@ class SettingsViewModel : ViewModel() {
     fun connect() {
         //Log.i("SettingsScreen", "Save settings: $serverUrl, $deviceName, $registrationCode")
         viewModelScope.launch {
-            DeviceService.setServerAddress(serverAddress)
+            deviceService.setServerAddress(serverAddress)
-            DeviceService.createIntegration(deviceName, registrationCode)
+            deviceService.createIntegration(deviceName, registrationCode)
         }
     }
 
@@ -35,4 +36,15 @@ class SettingsViewModel : ViewModel() {
     fun onRegistrationCodeChanged(code: String) {
         registrationCode = code
     }
+
+    companion object {
+        fun provideFactory(
+            deviceService: DeviceService,
+        ) = object : ViewModelProvider.Factory {
+            @Suppress("UNCHECKED_CAST")
+            override fun <T : ViewModel> create(modelClass: Class<T>): T {
+                return SettingsViewModel(deviceService) as T
+            }
+        }
+    }
 }

app/src/main/java/com/example/tvcontroller/services/DeviceService.kt

@@ -1,5 +1,7 @@
 package com.example.tvcontroller.services
 
+import android.content.Context
+import android.content.Context.MODE_PRIVATE
 import android.util.Log
 import io.ktor.client.engine.cio.*
 import io.ktor.client.*
@@ -11,10 +13,16 @@ import io.ktor.client.statement.HttpResponse
 import io.ktor.http.HttpMethod
 import org.json.JSONObject
 
-object DeviceService {
+private const val SHARED_PREFERENCES_NAME = "devices";
+
+class DeviceService(private val context: Context) {
     private var client = HttpClient(CIO)
     private var serverAddress: String = ""
 
+    init {
+        loadPreferences()
+    }
+
     suspend fun createIntegration(name: String, code: String) {
         Log.i("DeviceService", "Creating integration for $name with code $code at $serverAddress")
         val json = JSONObject()
@@ -29,6 +37,7 @@ object DeviceService {
                 }
             }
 
+            savePreferences()
             val body: String = response.body()
             Log.i("DeviceService", "Response: ${response.status.value} $body")
         } catch (e: Exception) {
@@ -36,6 +45,20 @@ object DeviceService {
         }
     }
 
+    private fun loadPreferences() {
+        val sharedPreferences = context.getSharedPreferences(SHARED_PREFERENCES_NAME, MODE_PRIVATE)
+        serverAddress = sharedPreferences.getString("server_address", "")!!
+    }
+
+    private fun savePreferences() {
+        val sharedPreferences = context.getSharedPreferences(SHARED_PREFERENCES_NAME, MODE_PRIVATE)
+        val editor = sharedPreferences.edit()
+        editor.apply {
+            putString("server_address", serverAddress)
+            apply()
+        }
+    }
+
     fun setServerAddress(url: String) {
         serverAddress = url
     }