feat(Lamp): Support setting Brightness on Android 13 and later

src/Uno.UWP/Devices/Lights/Lamp.Android.cs

@@ -54,7 +54,7 @@ public float BrightnessLevel
 			get => _brightness;
 			set
 			{
-				_brightness = value > 0 ? 1 : 0;
+				_brightness = value;
 				UpdateLampState();
 			}
 		}
@@ -113,15 +113,37 @@ private void UpdateLampState()
 			var isOn = _isEnabled && _brightness > 0;
 			lock (_lock)
 			{
-				if ((int)Build.VERSION.SdkInt >= (int)BuildVersionCodes.M)
+				if ((int)Build.VERSION.SdkInt >= (int)BuildVersionCodes.Tiramisu)
+				{
+					_cameraManager.SetTorchMode(_defaultCameraId, isOn);
+					if (!isOn)
+					{
+						return;
+					}
+
+					var characteristics = _cameraManager.GetCameraCharacteristics(_defaultCameraId);
+					const int minLevel = 1;
+					var maxLevel = (Java.Lang.Integer)characteristics.Get(CameraCharacteristics.FlashInfoStrengthMaximumLevel);
+					if (maxLevel is null)
+					{
+						// https://developer.android.com/reference/android/hardware/camera2/CameraCharacteristics#FLASH_INFO_STRENGTH_MAXIMUM_LEVEL
+						// The value for this key will be null for devices with no flash unit.
+						return;
+					}
+
+					// Android ranges from 1 (minLevel) to maxLevel
+					// _brightness ranges from 0 to 1
+					var nativeLevel = minLevel + _brightness * ((int)maxLevel - minLevel);
+					_cameraManager.TurnOnTorchWithStrengthLevel(_defaultCameraId, (int)Math.Round(nativeLevel));
+				}
+				else if ((int)Build.VERSION.SdkInt >= (int)BuildVersionCodes.M)
 				{
 					_cameraManager.SetTorchMode(_defaultCameraId, isOn);
 				}
 				else
 				{
-#pragma warning disable CS0618
-#pragma warning disable CA1422 // Validate platform compatibility
 					// using deprecated API for older Android versions
+#pragma warning disable CS0618 // Type or member is obsolete
 					var param = _camera.GetParameters();
 					param.FlashMode = _isEnabled ?
 						Android.Hardware.Camera.Parameters.FlashModeTorch :
@@ -136,8 +158,7 @@ private void UpdateLampState()
 					{
 						_camera.StopPreview();
 					}
-#pragma warning restore CS0618
-#pragma warning restore CA1422 // Validate platform compatibility
+#pragma warning restore CS0618 // Type or member is obsolete
 				}
 			}
 		}