bluetooth check and enabling

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

@@ -18,6 +18,7 @@ import androidx.annotation.RequiresApi
 import androidx.annotation.RequiresPermission
 import androidx.compose.ui.platform.LocalContext
 import androidx.core.app.ActivityCompat
+import androidx.core.app.ActivityCompat.startActivityForResult
 import com.example.smart_watch_android.MainViewModel
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -40,7 +41,7 @@ object BLEManager{
     private val deviceUUIDs = DeviceUUIDs
     private var bluetoothGatt: BluetoothGatt? = null
     private lateinit var bluetoothManager: BluetoothManager
-    private lateinit var bluetoothAdapter: BluetoothAdapter
+    lateinit var bluetoothAdapter: BluetoothAdapter
     val gattCallback = object : BluetoothGattCallback() {
         @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
         override fun onConnectionStateChange(gatt: BluetoothGatt, status: Int, newState: Int) {
@@ -108,7 +109,6 @@ object BLEManager{
         }
 
         if (missingPermissions.isNotEmpty()) {
-            // Berechtigungen anfordern
             ActivityCompat.requestPermissions(activity, missingPermissions.toTypedArray(), 101)
         } else {
             Log.d("ESP32_BLE", "Alle Bluetooth-Berechtigungen sind bereits erteilt!")

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

@@ -1,11 +1,15 @@
 package com.example.smart_watch_android
 
 import android.Manifest
+import android.bluetooth.BluetoothAdapter
+import android.content.Intent
 import android.os.Build
 import android.os.Bundle
+import android.util.Log
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.activity.viewModels
 import androidx.annotation.RequiresApi
 import androidx.annotation.RequiresPermission
@@ -17,12 +21,24 @@ import com.example.smart_watch_android.BLE.BLEManager
 import com.example.smart_watch_android.Screens.AppNavigation
 
 class MainActivity : ComponentActivity() {
+    private val enableBluetoothLauncher = registerForActivityResult(
+        ActivityResultContracts.StartActivityForResult()
+    ) { result ->
+        if (result.resultCode == RESULT_OK) {
+            Log.d("BLE_","Bluetooth enabled")
+        }
+    }
     private val viewModel: MainViewModel by viewModels()
     @RequiresApi(Build.VERSION_CODES.S)
     @RequiresPermission(Manifest.permission.BLUETOOTH_CONNECT)
     override fun onCreate(savedInstanceState: Bundle?,) {
         super.onCreate(savedInstanceState)
         BLEManager.init(context = applicationContext, activity = this)
+        val adapter = BLEManager.bluetoothAdapter
+        if (!adapter.isEnabled) {
+            val enableBtIntent = Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)
+            enableBluetoothLauncher.launch(enableBtIntent)
+        }
         enableEdgeToEdge()
         setContent {
             MaterialTheme {

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

@@ -62,10 +62,6 @@ fun ConnectScreen(viewModel: MainViewModel) {
         horizontalAlignment = Alignment.CenterHorizontally
     )
     {
-        Box(
-        ){
-            Text("if the list is empty ensure you have bluetooth enabled!")
-        }
         Box(
             modifier = Modifier
                 .padding(16.dp)
@@ -100,16 +96,16 @@ fun ConnectScreen(viewModel: MainViewModel) {
 
         Spacer(modifier = Modifier.height(64.dp))
 
-            Button(
+        Button(
-                modifier = dynamicModifier,
+            modifier = dynamicModifier,
-                onClick = {BLEManager.connectToEsp32(context, viewModel.selectedDeviceAddress) },
+            onClick = {BLEManager.connectToEsp32(context, viewModel.selectedDeviceAddress) },
-                shape = CircleShape,
+            shape = CircleShape,
-                colors = ButtonDefaults.buttonColors(containerColor = Color(0xFF5E18BE))
+            colors = ButtonDefaults.buttonColors(containerColor = Color(0xFF5E18BE))
-            ) {
+        ) {
-                Text(
+            Text(
-                    text = "Connect",
+                text = "Connect",
-                    fontSize = 32.sp
+                fontSize = 32.sp
-                )
+            )
-            }
+        }
     }
 }