feat: implement serial bt connection to device

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

@@ -1,6 +1,5 @@
 package com.example.tvcontroller
 
-import android.content.ContentValues.TAG
 import android.os.Bundle
 import android.util.Log
 import androidx.activity.ComponentActivity
@@ -36,6 +35,8 @@ import com.example.tvcontroller.ui.views.CameraView
 import com.example.tvcontroller.ui.views.SettingsView
 
 
+const val TAG = "MainActivity"
+
 class MainActivity : ComponentActivity() {
     private lateinit var bluetoothService: BluetoothService
     private lateinit var deviceService: DeviceService
@@ -62,10 +63,12 @@ class MainActivity : ComponentActivity() {
     }
 
     private fun checkPermissions() {
+        Log.i(TAG, "Checking permissions")
         if (!cameraService.hasRequiredPermissions()) {
             ActivityCompat.requestPermissions(this, CameraService.CAMERAX_PERMISSIONS, 0)
         }
         if (!bluetoothService.hasRequiredPermissions()) {
+            Log.i(TAG, "Requesting Bluetooth permissions")
             ActivityCompat.requestPermissions(this, BluetoothService.BLUETOOTH_PERMISSIONS, 0)
         }
     }
@@ -122,7 +125,7 @@ fun TvControllerApp(
     }) { innerPadding ->
         NavHost(
             navController = navController,
-            startDestination = Screen.Camera.name,
+            startDestination = Screen.Settings.name,
             modifier = Modifier.padding(innerPadding)
         ) {
             composable(route = Screen.Camera.name) {

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

@@ -1,6 +1,5 @@
 package com.example.tvcontroller
 
-import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
@@ -8,10 +7,11 @@ import androidx.compose.runtime.setValue
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.viewModelScope
+import com.example.tvcontroller.data.BluetoothDevice
 import com.example.tvcontroller.services.BluetoothService
 import com.example.tvcontroller.services.ControllerService
 import com.example.tvcontroller.services.DeviceService
-import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 
 class SettingsViewModel(
@@ -29,9 +29,7 @@ class SettingsViewModel(
         private set
     var controllerConnectionState by mutableIntStateOf(controllerService.connectionState)
         private set
-    var activeView by mutableStateOf(MAIN_SETTINGS_VIEW)
 
-    var scannedDevices = bluetoothService.scannedDevices
     var pairedDevices = bluetoothService.pairedDevices
 
     init {
@@ -53,11 +51,6 @@ class SettingsViewModel(
         }
     }
 
-    fun connectController() {
-        //Log.i("SettingsScreen", "Connect controller")
-        //controllerService.connect()
-    }
-
     private fun updateConnectionState() {
         connectionState = if (deviceService.getToken().isEmpty()) {
             Settings.ConnectionState.Unregistered
@@ -77,6 +70,12 @@ class SettingsViewModel(
         deviceName = integration.name
     }
 
+    fun connectBluetoothDevice(device: BluetoothDevice) {
+        viewModelScope.launch(Dispatchers.IO) {
+            bluetoothService.connectToDevice(device)
+        }
+    }
+
     fun onServerAddressChanged(url: String) {
         serverAddress = url
     }
@@ -89,14 +88,6 @@ class SettingsViewModel(
         registrationCode = code
     }
 
-    fun startBluetoothScan() {
-        bluetoothService.startDiscovery()
-    }
-
-    fun stopBluetoothScan() {
-        bluetoothService.stopDiscovery()
-    }
-
     companion object {
         const val MAIN_SETTINGS_VIEW = 0
         const val CONNECT_CONTROLLER_VIEW = 1

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

@@ -1,7 +1,9 @@
 package com.example.tvcontroller.services
 
+import android.Manifest
 import android.bluetooth.BluetoothAdapter
 import android.bluetooth.BluetoothManager
+import android.bluetooth.BluetoothSocket
 import android.content.Context
 import android.content.Intent
 import android.content.BroadcastReceiver
@@ -15,54 +17,38 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.update
+import kotlinx.io.IOException
+import java.util.UUID
+
+private const val SERIAL_PORT_SERVICE_UUID = "00001101-0000-1000-8000-00805F9B34FB"
+private const val TAG = "BluetoothService"
 
 class BluetoothService(private val context: Context) {
     private var bluetoothManager: BluetoothManager =
-        getSystemService(context, BluetoothManager::class.java)!!;
+        getSystemService(context, BluetoothManager::class.java)!!
     private var bluetoothAdapter: BluetoothAdapter = bluetoothManager.adapter
-    private var bluetoothStateChangedCallbacks: MutableList<(Int) -> Unit> = mutableListOf()
+
-    private val _scannedDevices = MutableStateFlow<List<BluetoothDevice>>(emptyList())
-    var scannedDevices: StateFlow<List<BluetoothDevice>> = _scannedDevices.asStateFlow()
     private val _pairedDevices = MutableStateFlow<List<BluetoothDevice>>(emptyList())
     var pairedDevices: StateFlow<List<BluetoothDevice>> = _pairedDevices.asStateFlow()
+    private var clientSocket: BluetoothSocket? = null
 
+    private var bluetoothStateChangedCallbacks: MutableList<(Int) -> Unit> = mutableListOf()
     private var bluetoothStateReceiver: BroadcastReceiver? = object : BroadcastReceiver() {
         override fun onReceive(context: Context, intent: Intent) {
             val state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR)
             bluetoothStateChangedCallbacks.forEach { it(state) }
         }
     }
-    private var foundDeviceReceiver: BroadcastReceiver? = object : BroadcastReceiver() {
-        override fun onReceive(context: Context, intent: Intent) {
-            val device = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
-                intent.getParcelableExtra(
-                    android.bluetooth.BluetoothDevice.EXTRA_DEVICE,
-                    android.bluetooth.BluetoothDevice::class.java
-                )
-            } else {
-                intent.getParcelableExtra(android.bluetooth.BluetoothDevice.EXTRA_DEVICE)
-            }
-            if (device != null) {
-                val newDevice = BluetoothDevice.fromBluetoothDevice(device)
-                Log.i("BluetoothService", "Found device: $newDevice")
-                _scannedDevices.update { devices -> if (newDevice in devices) devices else devices + newDevice }
-            }
-        }
-    }
 
     init {
-        registerBluetoothStateReceiver()
+        context.registerReceiver(
+            bluetoothStateReceiver, IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED)
+        )
         updatePairedDevices()
     }
 
     fun isBluetoothEnabled(): Boolean {
-        return bluetoothAdapter.isEnabled ?: false
+        return bluetoothAdapter.isEnabled
-    }
-
-    private fun registerBluetoothStateReceiver() {
-        context.registerReceiver(
-            bluetoothStateReceiver, IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED)
-        )
     }
 
     fun onBluetoothStateChanged(callback: (Int) -> Unit) {
@@ -75,7 +61,8 @@ class BluetoothService(private val context: Context) {
 
     fun cleanUp() {
         context.unregisterReceiver(bluetoothStateReceiver)
-        context.unregisterReceiver(foundDeviceReceiver)
+        bluetoothStateChangedCallbacks.clear()
+        closeBluetoothConnection()
     }
 
     fun updatePairedDevices() {
@@ -89,29 +76,24 @@ class BluetoothService(private val context: Context) {
         }
     }
 
-    fun startDiscovery() {
+    fun connectToDevice(device: BluetoothDevice) {
-        try {
+        Log.i(TAG, "Initiating connection process")
-            if (bluetoothAdapter.isDiscovering) return
+        if (context.checkSelfPermission(Manifest.permission.BLUETOOTH_ADMIN) != PackageManager.PERMISSION_GRANTED) {
-
+            Log.e(TAG, "Bluetooth permission not granted")
-            Log.i("BluetoothService", "Starting discovery")
+            return
-            context.registerReceiver(
-                foundDeviceReceiver,
-                IntentFilter(android.bluetooth.BluetoothDevice.ACTION_FOUND)
-            )
-            updatePairedDevices()
-            bluetoothAdapter.startDiscovery()
-        } catch (e: SecurityException) {
-            println("Error starting discovery: $e")
-            Log.e("BluetoothService", "Error starting discovery: $e")
         }
-    }
+        Log.i(TAG, "Connecting to device: $device")
-
-    fun stopDiscovery() {
-        context.unregisterReceiver(foundDeviceReceiver)
         try {
-            bluetoothAdapter.cancelDiscovery()
+            var androidBluetoothDevice = bluetoothAdapter.getRemoteDevice(device.getAddress())
-        } catch (e: SecurityException) {
+            Log.i(TAG, "Creating socket to device: $device")
-            println("Error stopping discovery: $e")
+            clientSocket = androidBluetoothDevice.createRfcommSocketToServiceRecord(
+                UUID.fromString(SERIAL_PORT_SERVICE_UUID)
+            )
+            Log.i(TAG, "Connecting to socket")
+            clientSocket?.connect()
+            Log.i(TAG, "Connected to device: $device")
+        } catch (e: IOException) {
+            Log.e(TAG, "Error connecting to device: $e")
         }
     }
 
@@ -125,18 +107,22 @@ class BluetoothService(private val context: Context) {
         return bluetoothAdapter.state
     }
 
+    fun closeBluetoothConnection() {
+        clientSocket?.close()
+        clientSocket = null
+    }
+
     companion object {
-        val BLUETOOTH_PERMISSIONS = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+        val BLUETOOTH_PERMISSIONS = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.S) {
             arrayOf(
-                android.Manifest.permission.BLUETOOTH,
+                Manifest.permission.BLUETOOTH, Manifest.permission.BLUETOOTH_ADMIN
-                android.Manifest.permission.BLUETOOTH_CONNECT,
-                android.Manifest.permission.BLUETOOTH_SCAN,
-                android.Manifest.permission.BLUETOOTH_ADMIN
             )
         } else {
             arrayOf(
-                android.Manifest.permission.BLUETOOTH,
+                Manifest.permission.BLUETOOTH,
-                android.Manifest.permission.BLUETOOTH_ADMIN
+                Manifest.permission.BLUETOOTH_CONNECT,
+                Manifest.permission.BLUETOOTH_SCAN,
+                Manifest.permission.BLUETOOTH_ADMIN
             )
         }
     }

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

@@ -27,14 +27,13 @@ class ControllerService(bluetoothService: BluetoothService) {
     private fun handleBluetoothStateChanged(state: Int) {
         when (state) {
             BluetoothAdapter.STATE_OFF -> setConnectionState(BLUETOOTH_DISABLED)
-            else -> setConnectionState(NOT_PAIRED)
+            else -> setConnectionState(NOT_CONNECTED)
         }
     }
 
     companion object {
         const val BLUETOOTH_DISABLED = 0
-        const val NOT_PAIRED = 1
+        const val NOT_CONNECTED = 1
-        const val NOT_CONNECTED = 2
+        const val CONNECTED = 2
-        const val CONNECTED = 3
     }
 }

app/src/main/java/com/example/tvcontroller/ui/views/SettingsView.kt

@@ -1,6 +1,7 @@
 package com.example.tvcontroller.ui.views
 
 import android.annotation.SuppressLint
+import android.util.Log
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
@@ -18,16 +19,24 @@ import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarColors
+import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.compose.NavHost
+import androidx.navigation.compose.composable
+import androidx.navigation.compose.rememberNavController
 import com.example.tvcontroller.R
 import com.example.tvcontroller.Settings
 import com.example.tvcontroller.SettingsViewModel
+import com.example.tvcontroller.SettingsViewModel.Companion.CONNECT_CONTROLLER_VIEW
+import com.example.tvcontroller.SettingsViewModel.Companion.MAIN_SETTINGS_VIEW
 import com.example.tvcontroller.services.BluetoothService
 import com.example.tvcontroller.services.ControllerService
 import com.example.tvcontroller.services.DeviceService
@@ -45,6 +54,7 @@ fun SettingsView(
             deviceService, controllerService, bluetoothService
         )
     )
+    val navController = rememberNavController()
 
     @Composable
     fun MainSettingsView() {
@@ -98,7 +108,7 @@ fun SettingsView(
                 style = MaterialTheme.typography.bodyMedium
             )
             OutlinedButton(
-                onClick = { viewModel.activeView = SettingsViewModel.CONNECT_CONTROLLER_VIEW },
+                onClick = { navController.navigate(CONNECT_CONTROLLER_VIEW.toString()) },
                 enabled = viewModel.controllerConnectionState != ControllerService.BLUETOOTH_DISABLED && viewModel.controllerConnectionState != ControllerService.CONNECTED,
                 modifier = Modifier.fillMaxWidth()
             ) {
@@ -109,17 +119,16 @@ fun SettingsView(
         }
     }
 
-    @SuppressLint("MissingPermission")
     @Composable
     fun ConnectControllerView() {
-        viewModel.startBluetoothScan()
         val pairedDevices = viewModel.pairedDevices.collectAsState()
-        val scannedDevices = viewModel.scannedDevices.collectAsState()
         Column {
             TopAppBar(
                 title = { Text(text = stringResource(id = R.string.connect_controller_title)) },
                 navigationIcon = {
-                    IconButton(onClick = {}) {
+                    IconButton(onClick = {
+                        navController.navigate(MAIN_SETTINGS_VIEW.toString())
+                    }) {
                         Icon(
                             painterResource(id = R.drawable.baseline_arrow_back_24),
                             contentDescription = "Back"
@@ -143,32 +152,20 @@ fun SettingsView(
                                 device.getAddress()
                             )
                         },
-                    )
+                        modifier = Modifier.clickable(onClick = {
-                }
+                            viewModel.connectBluetoothDevice(
-                Spacer(modifier = Modifier.padding(8.dp))
+                                device
-                Text(
-                    text = stringResource(id = R.string.scanned_devices_label),
-                    style = MaterialTheme.typography.headlineSmall,
-                    modifier = Modifier.padding(start = 16.dp)
-                )
-                scannedDevices.value.forEach { device ->
-                    if (device != null) ListItem(
-                        headlineContent = { Text(device.getName()) },
-                        supportingContent = {
-                            if (device.getName() != device.getAddress()) Text(
-                                device.getAddress()
                             )
-                        },
+                        })
-                        modifier = Modifier.clickable(onClick = {})
                     )
                 }
             }
         }
     }
 
-    when (viewModel.activeView) {
+    NavHost(navController = navController, startDestination = MAIN_SETTINGS_VIEW.toString()) {
-        SettingsViewModel.MAIN_SETTINGS_VIEW -> MainSettingsView()
+        composable(route = MAIN_SETTINGS_VIEW.toString()) { MainSettingsView() }
-        SettingsViewModel.CONNECT_CONTROLLER_VIEW -> ConnectControllerView()
+        composable(route = CONNECT_CONTROLLER_VIEW.toString()) { ConnectControllerView() }
     }
 }