General use function to detect flash with Xamarin.Android

gistfile1.cs

public bool HasFlash()
{
    if (_camera == null)
    {
        return false;
    }

    bool hasFlash = MyMainActivity.PackageManager.HasSystemFeature(Android.Content.PM.PackageManager.FeatureCameraFlash);
    if (hasFlash)
        return true;

    Camera.Parameters parameters = _camera.GetParameters();

    if (parameters.FlashMode == null)
    {
        return false;
    }

    List<string> supportedFlashModes = parameters.SupportedFlashModes.ToList<string>();
    if (supportedFlashModes == null || supportedFlashModes.Count == 0 || (supportedFlashModes.Count == 1 && supportedFlashModes[0].Equals(Camera.Parameters.FlashModeOff)))
    {
        return false;
    }

    return true;
}