[O] Optimize bluetooth handler initialization

app/src/main/java/org/hydev/wearsync/ActivityScan.kt

@@ -10,6 +10,7 @@ import com.welie.blessed.BluetoothPeripheral
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.consumeAsFlow
 import org.hydev.wearsync.bles.BluetoothHandler
+import org.hydev.wearsync.bles.BluetoothHandler.Companion.ble
 import org.hydev.wearsync.bles.ObservationUnit
 import org.hydev.wearsync.databinding.ActivityScanBinding
 import java.text.DateFormat
@@ -22,9 +23,6 @@ class ActivityScan : AppCompatActivity() {
     private val scope = CoroutineScope(SupervisorJob() + Dispatchers.IO)
     private val dateFormat: DateFormat = SimpleDateFormat("dd-MM-yyyy HH:mm:ss", Locale.ENGLISH)
 
-    private val blueMan by lazy { blueMan() }
-    private lateinit var bluetoothHandler: BluetoothHandler
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityScanBinding.inflate(layoutInflater)
@@ -33,22 +31,17 @@ class ActivityScan : AppCompatActivity() {
         initBluetoothHandler()
     }
 
-    private val central get() = bluetoothHandler.central
-
     @SuppressLint("MissingPermission")
     private fun initBluetoothHandler() {
-        if (this::bluetoothHandler.isInitialized) return
-        bluetoothHandler = BluetoothHandler.ble(this)
-
         println("OnCreate called, Initializing...")
 
         // List bonded device addresses
-        val pairedDevices = blueMan.adapter.bondedDevices.toList()
+        val pairedDevices = blueMan().adapter.bondedDevices.toList()
         val pairedAddresses = pairedDevices.map { it.address }.toSet()
 
         // Scan devices
         val scannedDevices = ArrayList<BluetoothPeripheral>()
-        central.scanForPeripherals({ peripheral, scanResult ->
+        ble.central.scanForPeripherals({ peripheral, scanResult ->
             if (peripheral.name.isBlank() || scannedDevices.contains(peripheral)) return@scanForPeripherals
 
             // Add to scanned devices
@@ -64,8 +57,8 @@ class ActivityScan : AppCompatActivity() {
 
         // Click scanned device
         binding.lvScanned.setOnItemClickListener { parent, view, position, id ->
-            central.stopScan()
-            bluetoothHandler.connectPeripheral(scannedDevices[position]) {
+            ble.central.stopScan()
+            ble.connectPeripheral(scannedDevices[position]) {
                 view.snack("✅ Connected.")
             }
         }
@@ -83,16 +76,16 @@ class ActivityScan : AppCompatActivity() {
             view.snack("Connecting...")
 
             // Scan for the device with the MAC address
-            bluetoothHandler.connectAddress(dev.address) {
+            ble.connectAddress(dev.address) {
                 view.snack("✅ Connected.")
             }
         }
 
-        collectHeartRate(bluetoothHandler)
-        collectPulseOxContinuous(bluetoothHandler)
-        collectPulseOxSpot(bluetoothHandler)
-        collectTemperature(bluetoothHandler)
-        collectWeight(bluetoothHandler)
+        collectHeartRate(ble)
+        collectPulseOxContinuous(ble)
+        collectPulseOxSpot(ble)
+        collectTemperature(ble)
+        collectWeight(ble)
     }
 
     private fun collectHeartRate(bluetoothHandler: BluetoothHandler) {

app/src/main/java/org/hydev/wearsync/bles/BluetoothHandler.kt

@@ -236,51 +236,50 @@ internal class BluetoothHandler private constructor(context: Context) {
 
     companion object {
         // UUIDs for the Blood Pressure service (BLP)
-        private val BLP_SERVICE_UUID: UUID = UUID.fromString("00001810-0000-1000-8000-00805f9b34fb")
-        private val BLP_MEASUREMENT_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A35-0000-1000-8000-00805f9b34fb")
+        val BLP_SERVICE_UUID: UUID = UUID.fromString("00001810-0000-1000-8000-00805f9b34fb")
+        val BLP_MEASUREMENT_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A35-0000-1000-8000-00805f9b34fb")
 
         // UUIDs for the Health Thermometer service (HTS)
-        private val HTS_SERVICE_UUID = UUID.fromString("00001809-0000-1000-8000-00805f9b34fb")
-        private val HTS_MEASUREMENT_CHARACTERISTIC_UUID = UUID.fromString("00002A1C-0000-1000-8000-00805f9b34fb")
+        val HTS_SERVICE_UUID = UUID.fromString("00001809-0000-1000-8000-00805f9b34fb")
+        val HTS_MEASUREMENT_CHARACTERISTIC_UUID = UUID.fromString("00002A1C-0000-1000-8000-00805f9b34fb")
 
         // UUIDs for the Heart Rate service (HRS)
-        private val HRS_SERVICE_UUID: UUID = UUID.fromString("0000180D-0000-1000-8000-00805f9b34fb")
-        private val HRS_MEASUREMENT_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A37-0000-1000-8000-00805f9b34fb")
+        val HRS_SERVICE_UUID: UUID = UUID.fromString("0000180D-0000-1000-8000-00805f9b34fb")
+        val HRS_MEASUREMENT_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A37-0000-1000-8000-00805f9b34fb")
 
         // UUIDs for the Device Information service (DIS)
-        private val DIS_SERVICE_UUID: UUID = UUID.fromString("0000180A-0000-1000-8000-00805f9b34fb")
-        private val MANUFACTURER_NAME_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A29-0000-1000-8000-00805f9b34fb")
-        private val MODEL_NUMBER_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A24-0000-1000-8000-00805f9b34fb")
+        val DIS_SERVICE_UUID: UUID = UUID.fromString("0000180A-0000-1000-8000-00805f9b34fb")
+        val MANUFACTURER_NAME_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A29-0000-1000-8000-00805f9b34fb")
+        val MODEL_NUMBER_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A24-0000-1000-8000-00805f9b34fb")
 
         // UUIDs for the Current Time service (CTS)
-        private val CTS_SERVICE_UUID: UUID = UUID.fromString("00001805-0000-1000-8000-00805f9b34fb")
-        private val CURRENT_TIME_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A2B-0000-1000-8000-00805f9b34fb")
+        val CTS_SERVICE_UUID: UUID = UUID.fromString("00001805-0000-1000-8000-00805f9b34fb")
+        val CURRENT_TIME_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A2B-0000-1000-8000-00805f9b34fb")
 
         // UUIDs for the Battery Service (BAS)
-        private val BTS_SERVICE_UUID: UUID = UUID.fromString("0000180F-0000-1000-8000-00805f9b34fb")
-        private val BATTERY_LEVEL_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A19-0000-1000-8000-00805f9b34fb")
+        val BTS_SERVICE_UUID: UUID = UUID.fromString("0000180F-0000-1000-8000-00805f9b34fb")
+        val BATTERY_LEVEL_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A19-0000-1000-8000-00805f9b34fb")
 
         // UUIDs for the Pulse Oximeter Service (PLX)
         val PLX_SERVICE_UUID: UUID = UUID.fromString("00001822-0000-1000-8000-00805f9b34fb")
-        private val PLX_SPOT_MEASUREMENT_CHAR_UUID: UUID = UUID.fromString("00002a5e-0000-1000-8000-00805f9b34fb")
-        private val PLX_CONTINUOUS_MEASUREMENT_CHAR_UUID: UUID = UUID.fromString("00002a5f-0000-1000-8000-00805f9b34fb")
+        val PLX_SPOT_MEASUREMENT_CHAR_UUID: UUID = UUID.fromString("00002a5e-0000-1000-8000-00805f9b34fb")
+        val PLX_CONTINUOUS_MEASUREMENT_CHAR_UUID: UUID = UUID.fromString("00002a5f-0000-1000-8000-00805f9b34fb")
 
         // UUIDs for the Weight Scale Service (WSS)
         val WSS_SERVICE_UUID: UUID = UUID.fromString("0000181D-0000-1000-8000-00805f9b34fb")
-        private val WSS_MEASUREMENT_CHAR_UUID: UUID = UUID.fromString("00002A9D-0000-1000-8000-00805f9b34fb")
+        val WSS_MEASUREMENT_CHAR_UUID: UUID = UUID.fromString("00002A9D-0000-1000-8000-00805f9b34fb")
         val GLUCOSE_SERVICE_UUID: UUID = UUID.fromString("00001808-0000-1000-8000-00805f9b34fb")
         val GLUCOSE_MEASUREMENT_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A18-0000-1000-8000-00805f9b34fb")
         val GLUCOSE_RECORD_ACCESS_POINT_CHARACTERISTIC_UUID: UUID = UUID.fromString("00002A52-0000-1000-8000-00805f9b34fb")
 
         // Contour Glucose Service
         val CONTOUR_SERVICE_UUID: UUID = UUID.fromString("00000000-0002-11E2-9E96-0800200C9A66")
-        private val CONTOUR_CLOCK = UUID.fromString("00001026-0002-11E2-9E96-0800200C9A66")
-        private var instance: BluetoothHandler? = null
+        val CONTOUR_CLOCK = UUID.fromString("00001026-0002-11E2-9E96-0800200C9A66")
 
-        @Synchronized
-        fun ble(context: Context): BluetoothHandler {
+        private var instance: BluetoothHandler? = null
+        val Context.ble get(): BluetoothHandler {
             if (instance == null) {
-                instance = BluetoothHandler(context.applicationContext)
+                instance = BluetoothHandler(this)
             }
             return instance!!
         }

app/src/main/java/org/hydev/wearsync/bles/ScanException.kt

@@ -3,5 +3,3 @@ package org.hydev.wearsync.bles
 import com.welie.blessed.ScanFailure
 
 class ScanException(val fail: ScanFailure) : Exception()
-{
-}