static Task ToggleTorchAsync(bool switchOn)
{
return(Task.Run(() =>
{
lock (locker)
{
if (Platform.HasApiLevel(BuildVersionCodes.M) && !AlwaysUseCameraApi)
{
var cameraManager = Platform.CameraManager;
foreach (var id in cameraManager.GetCameraIdList())
{
var hasFlash = cameraManager.GetCameraCharacteristics(id).Get(CameraCharacteristics.FlashInfoAvailable);
if (Java.Lang.Boolean.True.Equals(hasFlash))
{
cameraManager.SetTorchMode(id, switchOn);
break;
}
}
}
else
{
if (camera == null)
{
if (surface == null)
{
surface = new SurfaceTexture(0);
}
#pragma warning disable CS0618 // Camera types are deprecated in Android 10+
camera = Camera.Open();
// Nexus 5 and some devices require a preview texture
camera.SetPreviewTexture(surface);
}
var param = camera.GetParameters();
// Deprecated in an earlier android version
param.FlashMode = switchOn ? Camera.Parameters.FlashModeTorch : Camera.Parameters.FlashModeOff;
camera.SetParameters(param);
if (switchOn)
{
camera.StartPreview();
}
else
{
camera.StopPreview();
camera.Release();
camera.Dispose();
#pragma warning restore CS0618 // Type or member is obsolete
camera = null;
surface.Dispose();
surface = null;
}
}
}
}));
}
private void StopCamera()
{
camera.SetPreviewCallback(null);
camera.StopPreview();
camera.Release();
camera.Dispose();
camera = null;
}
public void SurfaceDestroyed(ISurfaceHolder holder)
{
Logger.LogInfo(nameof(SurfaceHolderCallback), nameof(SurfaceDestroyed), "called.");
_Camera.StopPreview();
_Camera.Release();
_Camera.Dispose();
_Camera = null;
}
Task ToggleTorchAsync(bool switchOn)
{
return(Task.Run(() =>
{
lock (locker)
{
if (OperatingSystem.IsAndroidVersionAtLeast((int)BuildVersionCodes.M) && !AlwaysUseCameraApi)
{
foreach (var id in CameraManager.GetCameraIdList())
{
var hasFlash = CameraManager.GetCameraCharacteristics(id).Get(CameraCharacteristics.FlashInfoAvailable);
if (Java.Lang.Boolean.True.Equals(hasFlash))
{
try
{
CameraManager.SetTorchMode(id, switchOn);
break;
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine($"Unable to SetTorchMode on {id}: {ex.Message}");
}
}
}
}
else
{
if (camera == null)
{
if (surface == null)
{
surface = new SurfaceTexture(0);
}
#pragma warning disable CS0618 // Camera types are deprecated in Android 10+
camera = Camera.Open();
// Nexus 5 and some devices require a preview texture
camera.SetPreviewTexture(surface);
}
var param = camera.GetParameters();
// Deprecated in an earlier android version
param.FlashMode = switchOn ? Camera.Parameters.FlashModeTorch : Camera.Parameters.FlashModeOff;
camera.SetParameters(param);
if (switchOn)
{
camera.StartPreview();
}
else
{
camera.StopPreview();
camera.Release();
camera.Dispose();
#pragma warning restore CS0618 // Type or member is obsolete
camera = null;
surface.Dispose();
surface = null;
}
}
}
}));
}
public void SurfaceDestroyed(ISurfaceHolder holder)
{
_camera.Dispose();
}