feat: connect to device

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

@@ -5,7 +5,11 @@ import android.annotation.SuppressLint
 import android.app.Activity
 import android.app.AlertDialog
 import android.bluetooth.BluetoothAdapter
+import android.bluetooth.BluetoothDevice
+import android.bluetooth.BluetoothGatt
+import android.bluetooth.BluetoothGattCallback
 import android.bluetooth.BluetoothManager
+import android.bluetooth.BluetoothProfile
 import android.bluetooth.le.ScanCallback
 import android.bluetooth.le.ScanResult
 import android.bluetooth.le.ScanSettings
@@ -72,11 +76,56 @@ class MainActivity : AppCompatActivity() {
             }
         }
 
-    private var kirbyScanResults = ArrayList<ScanResult>();
+    private val kirbyScanResults = ArrayList<ScanResult>();
+
+    private val gattCallback = object : BluetoothGattCallback() {
+        override fun onConnectionStateChange(gatt: BluetoothGatt, status: Int, newState: Int) {
+            val deviceAddress = gatt.device.address
+            val deviceName = gatt.device.name
+
+            if (status == BluetoothGatt.GATT_SUCCESS) {
+                if (newState == BluetoothProfile.STATE_CONNECTED) {
+                    Log.i(
+                        "BluetoothGattCallback",
+                        "Successfully connected to $deviceAddress (${deviceName})"
+                    )
+                    // TODO: Store a reference to BluetoothGatt
+                } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
+                    Log.w(
+                        "BluetoothGattCallback",
+                        "Successfully disconnected from $deviceAddress (${deviceName})"
+                    )
+                    gatt.close()
+                }
+            } else {
+                Log.w(
+                    "BluetoothGattCallback",
+                    "Error $status encountered for $deviceAddress (${deviceName})! Disconnecting..."
+                )
+                gatt.close()
+            }
+        }
+    }
 
     private val scanResultAdapter: ScanResultAdapter by lazy {
-        ScanResultAdapter(kirbyScanResults) {
-            // TODO: Implement
+        ScanResultAdapter(kirbyScanResults) { scanResult ->
+            // User tapped on a scan result
+            if (isScanning) {
+                stopBleScan()
+            }
+
+            Log.i(
+                "ConnectCallback",
+                "Start connecting to ${scanResult.device} (${scanResult.device.name})"
+            )
+
+            scanResult.device.connectGatt(
+                applicationContext,
+                false,
+                gattCallback,
+                BluetoothDevice.TRANSPORT_LE
+            )
+
         }
     }