changes

app/src/main/java/com/example/smart_watch_android/BLE/BleManager.kt

@@ -14,10 +14,9 @@ import android.os.Build
 import android.util.Log
 import androidx.annotation.RequiresApi
 import androidx.annotation.RequiresPermission
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.setValue
 import androidx.core.app.ActivityCompat
+import com.example.smart_watch_android.MainActivity
+import com.example.smart_watch_android.ViewModel
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
@@ -28,63 +27,67 @@ import java.time.format.DateTimeFormatter
 import java.util.UUID
 import kotlin.time.Duration.Companion.milliseconds
 
-class BleManager(private val context: Context) {
+class BleManager(private val context: Context, val viewModel: ViewModel) {
-    val deviceAddress = "10:BD:A3:8F:01:0E"
+
+    //var deviceAddress = "10:BD:A3:8F:01:0E"
+    val devices = mutableListOf<Devices>()
+
     val currentDate: LocalDate? = LocalDate.now()
-    val deviceUUIDs = DeviceUUIDs
+    private val deviceUUIDs = DeviceUUIDs
     private var bluetoothGatt: BluetoothGatt? = null
 
     private var bluetoothManager: BluetoothManager? = null
     private var bluetoothAdapter: BluetoothAdapter? = null
+    var deviceAddress: String = ""
+    val gattCallback = object : BluetoothGattCallback() {
+        @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
+        override fun onConnectionStateChange(gatt: BluetoothGatt, status: Int, newState: Int) {
+            if (status == BluetoothGatt.GATT_SUCCESS) {
+                if (newState == BluetoothProfile.STATE_CONNECTED) {
+                    Log.d("ESP32_BLE", "Connected! Start discoverServices()...")
+                    gatt.discoverServices()
+                } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
+                    viewModel.setDeviceConection(false)
 
-    var isConnected by mutableStateOf(false)
+                    gatt.close()
-        private set
+                    bluetoothGatt = null
-
+                    Log.d("ESP32_BLE", "Disconnected.")
+                }
+            } else {
+                Log.d("ESP32_BLE", "error in onConnectionStateChange! Status-Code: $status")
+                viewModel.setDeviceConection(false)
+            }
+        }
 
+        override fun onServicesDiscovered(gatt: BluetoothGatt, status: Int) {
+            if (status == BluetoothGatt.GATT_SUCCESS) {
+                viewModel.setDeviceConection(true)
+                Log.d("ESP32_BLE", "connected successfully.")
+            }
+        }
+    }
+    data class Devices(
+        val deviceName: String,
+        val deviceMac: String
+    )
 
+    @RequiresApi(Build.VERSION_CODES.S)
     @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
     fun init() {
+        checkAndRequestBluetoothPermissions()
         bluetoothManager = context.getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
         bluetoothAdapter = bluetoothManager?.adapter
-
-        if (bluetoothAdapter == null) return
-
-        try {
-            val device = bluetoothAdapter?.getRemoteDevice(deviceAddress)
-            if (device != null) {
-                val state = bluetoothManager!!.getConnectionState(device, BluetoothProfile.GATT)
-                if (state == BluetoothProfile.STATE_CONNECTED) {
-                    Log.d("ESP32_BLE", "App restarted: device still connected. rebuild GATT-connection...")
-                    connectToEsp32(deviceAddress)
-                } else {
-                    isConnected = false
-                    Log.d("ESP32_BLE", "App restarted: not connected.")
-                }
-            }
-        } catch (e: Exception) {
-            Log.d("ESP32_BLE", "error while checking the status: ${e.message}")
-        }
     }
+
     @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
-    fun checkCurrentConnectionState(deviceAddress: String) {
+    fun getDeviceList(): List<Devices>{
-        if (bluetoothManager == null) return
+        bluetoothAdapter?.bondedDevices?.forEach { device ->
-
+            devices.add(Devices(deviceName = device.name, deviceMac = device.address))
-        try {
-            val device = bluetoothAdapter?.getRemoteDevice(deviceAddress)
-            if (device != null) {
-                val state = bluetoothManager!!.getConnectionState(device, BluetoothProfile.GATT)
-                if (state == BluetoothProfile.STATE_CONNECTED) {
-                    isConnected = true
-                    Log.d("ESP32_BLE", "App restarted: device still connected!")
-                } else {
-                    isConnected = false
-                    Log.d("ESP32_BLE", "App restarted: device not connected.")
-                }
-            }
-        } catch (e: Exception) {
-            Log.d("ESP32_BLE", "error while checking the status: ${e.message}")
         }
+        return devices
     }
+
+    @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
     @RequiresApi(Build.VERSION_CODES.S)
     fun checkAndRequestBluetoothPermissions() {
         val permissions = arrayOf(
@@ -107,7 +110,7 @@ class BleManager(private val context: Context) {
         }
     }
 
-    fun connectToEsp32(deviceAddress: String) {
+    fun connectToEsp32() {
         Log.d("ESP32_BLE", "connectToEsp32 started with address: $deviceAddress")
         if (bluetoothAdapter == null) {
             Log.d("ESP32_BLE", "error: Bluetooth is not supported!")
@@ -117,34 +120,6 @@ class BleManager(private val context: Context) {
         try {
             val device = bluetoothAdapter!!.getRemoteDevice(deviceAddress)
 
-            val gattCallback = object : BluetoothGattCallback() {
-                @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
-                override fun onConnectionStateChange(gatt: BluetoothGatt, status: Int, newState: Int) {
-                    if (status == BluetoothGatt.GATT_SUCCESS) {
-                        if (newState == BluetoothProfile.STATE_CONNECTED) {
-                            Log.d("ESP32_BLE", "Connected! Start discoverServices()...")
-                            gatt.discoverServices()
-                        } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
-                            isConnected = false
-
-                            gatt.close()
-                            bluetoothGatt = null
-                            Log.d("ESP32_BLE", "Disconnected.")
-                        }
-                    } else {
-                        Log.d("ESP32_BLE", "error in onConnectionStateChange! Status-Code: $status")
-                        isConnected = false
-                    }
-                }
-
-                override fun onServicesDiscovered(gatt: BluetoothGatt, status: Int) {
-                    if (status == BluetoothGatt.GATT_SUCCESS) {
-                        isConnected = true
-                        Log.d("ESP32_BLE", "connected successfully.")
-                    }
-                }
-            }
-
             if (ActivityCompat.checkSelfPermission(context, Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED) {
                 bluetoothGatt = device.connectGatt(context, false, gattCallback)
             } else {

app/src/main/java/com/example/smart_watch_android/BluetoothForgroundService.kt

@@ -1,47 +0,0 @@
-package com.example.smart_watch_android
-
-import android.app.Notification
-import android.app.NotificationChannel
-import android.app.NotificationManager
-import android.app.Service
-import android.content.Intent
-import android.os.IBinder
-import androidx.core.app.NotificationCompat
-
-class BluetoothForegroundService : Service() {
-    companion object {
-        const val CHANNEL_ID = "BluetoothServiceChannel"
-        const val NOTIFICATION_ID = 1
-    }
-
-    override fun onCreate() {
-        super.onCreate()
-    }
-
-    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
-        createNotificationChannel()
-
-        val notification: Notification = NotificationCompat.Builder(this, CHANNEL_ID)
-            .setContentTitle("Bluetooth connection active")
-            .setContentText("the app keeps the connection in the background.")
-            .setSmallIcon(android.R.drawable.stat_sys_data_bluetooth)
-            .build()
-
-        startForeground(NOTIFICATION_ID, notification)
-        return START_STICKY
-    }
-
-    override fun onBind(intent: Intent?): IBinder? {
-        return null
-    }
-
-    private fun createNotificationChannel() {
-        val serviceChannel = NotificationChannel(
-            CHANNEL_ID,
-            "Bluetooth Service Channel",
-            NotificationManager.IMPORTANCE_LOW
-        )
-        val manager = getSystemService(NotificationManager::class.java)
-        manager?.createNotificationChannel(serviceChannel)
-    }
-}

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

@@ -1,5 +1,6 @@
 package com.example.smart_watch_android
 
+import android.Manifest
 import android.content.Intent
 import android.os.Build
 import android.os.Bundle
@@ -8,37 +9,41 @@ import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
 import androidx.activity.viewModels
 import androidx.annotation.RequiresApi
+import androidx.annotation.RequiresPermission
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.ui.Modifier
+import com.example.smart_watch_android.BLE.BleManager
 import com.example.smart_watch_android.Screens.AppNavigation
 
 class MainActivity : ComponentActivity() {
-    private val viewModel: MainViewModel by viewModels()
+    lateinit var bleManager: BleManager
+    private val viewModel: ViewModel by viewModels()
 
     @RequiresApi(Build.VERSION_CODES.S)
-    @androidx.annotation.RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        viewModel.initBleManager(this)
+            bleManager = BleManager(this, viewModel)
-        viewModel.bleManager.checkAndRequestBluetoothPermissions()
+            bleManager.init()
         enableEdgeToEdge()
         setContent {
             MaterialTheme {
                 Surface(
                     modifier = Modifier.fillMaxSize(),
                     color = MaterialTheme.colorScheme.background
-                )  {
+                ) {
-                    AppNavigation(bleManager = viewModel.bleManager)
+                    AppNavigation(bleManager = bleManager, viewModel = viewModel)
                 }
             }
         }
-        startBluetoothService()
     }
-    private fun startBluetoothService() {
-        val serviceIntent = Intent(this, BluetoothForegroundService::class.java)
 
-        startForegroundService(serviceIntent)
+    @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
+    override fun onDestroy() {
+        super.onDestroy()
+        bleManager.disconnectEsp32()
+
     }
 }

app/src/main/java/com/example/smart_watch_android/MainViewModel.kt

@@ -1,24 +0,0 @@
-package com.example.smart_watch_android
-
-import android.Manifest
-import android.app.Application
-import android.content.Context
-import androidx.annotation.RequiresPermission
-import androidx.lifecycle.AndroidViewModel
-import com.example.smart_watch_android.BLE.BleManager
-
-class MainViewModel(
-    application: Application,
-) : AndroidViewModel(application) {
-
-    lateinit var bleManager: BleManager
-        private set
-
-    @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
-    fun initBleManager(activityContext: Context) {
-        if (!::bleManager.isInitialized) {
-            bleManager = BleManager(context = activityContext)
-            bleManager.init()
-        }
-    }
-}

app/src/main/java/com/example/smart_watch_android/Screens/AppNavigation.kt

@@ -1,25 +1,25 @@
 package com.example.smart_watch_android.Screens
 
 import android.Manifest
-import android.R
 import androidx.annotation.RequiresPermission
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
-import androidx.navigation.NavController
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.rememberNavController
 import com.example.smart_watch_android.BLE.BleManager
-import com.example.smart_watch_android.MainViewModel
+import com.example.smart_watch_android.ViewModel
 
 @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
 @Composable
-fun AppNavigation(bleManager: BleManager) {
+fun AppNavigation(bleManager: BleManager, viewModel: ViewModel) {
     val navController = rememberNavController()
+    val isConnected by viewModel.isDeviceConnected.collectAsState()
 
-    LaunchedEffect(bleManager.isConnected) {
+    LaunchedEffect(viewModel.isConnected) {
-        if (bleManager.isConnected) {
+        if (isConnected) {
             navController.navigate("control_panel") {
                 popUpTo("connect") { inclusive = true }
             }
@@ -29,7 +29,7 @@ fun AppNavigation(bleManager: BleManager) {
             }
         }
     }
-    val startDestination = if (bleManager.isConnected) {
+    val startDestination = if (isConnected) {
         "control_panel"
     } else {
         "connect"
@@ -42,7 +42,8 @@ fun AppNavigation(bleManager: BleManager) {
         // Connect Screen
         composable("connect") {
             ConnectScreen(
-                bleManager = bleManager
+                bleManager = bleManager,
+                viewModel = viewModel
             )
         }
 

app/src/main/java/com/example/smart_watch_android/Screens/ConnectScreen.kt

@@ -1,5 +1,8 @@
 package com.example.smart_watch_android.Screens
 
+import android.Manifest
+import android.util.Log
+import androidx.annotation.RequiresPermission
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -28,12 +31,14 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import com.example.smart_watch_android.BLE.BleManager
+import com.example.smart_watch_android.ViewModel
 
+@RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
 @Composable
-fun ConnectScreen(bleManager: BleManager) {
+fun ConnectScreen(bleManager: BleManager, viewModel: ViewModel) {
     var expanded by remember { mutableStateOf(false) }
     var selectedDevice by remember { mutableStateOf("device") }
-    val items = listOf("Option 1", "Option 2", "Option 3")
+    val devices = bleManager.getDeviceList()
     Column(
         modifier = Modifier
             .fillMaxSize()
@@ -53,11 +58,13 @@ fun ConnectScreen(bleManager: BleManager) {
                 expanded = expanded,
                 onDismissRequest = { expanded = false }
             ) {
-                items.forEach { item ->
+                devices.forEach { item ->
                     DropdownMenuItem(
-                        text = { Text(item) },
+                        text = { Text(item.deviceName) },
                         onClick = {
-                            selectedDevice = item
+                            selectedDevice = item.deviceName
+                            bleManager.deviceAddress = item.deviceMac
+                            Log.d("ConnectScreen", item.deviceMac)
                             expanded = false
                         }
                     )
@@ -67,8 +74,8 @@ fun ConnectScreen(bleManager: BleManager) {
         Spacer(modifier = Modifier.height(64.dp))
 
             Button(
-                onClick = { bleManager.connectToEsp32(deviceAddress = "10:BD:A3:8F:01:0E") },
                 modifier = Modifier.size(400.dp),
+                onClick = {bleManager.connectToEsp32() },
                 shape = CircleShape,
                 colors = ButtonDefaults.buttonColors(containerColor = Color(0xFF5E18BE))
             ) {

app/src/main/java/com/example/smart_watch_android/viewModel.kt

@@ -0,0 +1,16 @@
+package com.example.smart_watch_android
+
+import androidx.lifecycle.ViewModel
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+
+class ViewModel : ViewModel() {
+    var isConnected = MutableStateFlow(false)
+
+    val isDeviceConnected: StateFlow<Boolean> = isConnected.asStateFlow()
+
+    fun setDeviceConection(status: Boolean) {
+        isConnected.value = status
+    }
+}