// We fit the aspect ratio of TextureView to the size of preview we picked.
private void SetTextureViewAspectRatio()
{
var orientation = Resources.Configuration.Orientation;
if (orientation == Orientation.Landscape)
{
_textureView.SetAspectRatio(_previewSize.Width, _previewSize.Height);
}
else
{
_textureView.SetAspectRatio(_previewSize.Height, _previewSize.Width);
}
}
// Opens a CameraDevice. The result is listened to by 'mStateListener'.
private void OpenCamera()
{
Activity activity = Activity;
if (activity == null || activity.IsFinishing || mOpeningCamera)
{
return;
}
mOpeningCamera = true;
CameraManager manager = (CameraManager)activity.GetSystemService(Context.CameraService);
try
{
String cameraId = manager.GetCameraIdList()[0];
// To get a list of available sizes of camera preview, we retrieve an instance of
// StreamConfigurationMap from CameraCharacteristics
CameraCharacteristics characteristics = manager.GetCameraCharacteristics(cameraId);
StreamConfigurationMap map = (StreamConfigurationMap)characteristics.Get(CameraCharacteristics.ScalerStreamConfigurationMap);
mPreviewSize = map.GetOutputSizes(Java.Lang.Class.FromType(typeof(SurfaceTexture)))[0];
Android.Content.Res.Orientation orientation = Resources.Configuration.Orientation;
if (orientation == Android.Content.Res.Orientation.Landscape)
{
mTextureView.SetAspectRatio(mPreviewSize.Width, mPreviewSize.Height);
}
else
{
mTextureView.SetAspectRatio(mPreviewSize.Height, mPreviewSize.Width);
}
// We are opening the camera with a listener. When it is ready, OnOpened of mStateListener is called.
manager.OpenCamera(cameraId, mStateListener, null);
}
catch (Exception ex) {
Toast.MakeText(activity, "Cannot access the camera.", ToastLength.Short).Show();
Activity.Finish();
}
}
// Sets up member variables related to camera.
private void SetUpCameraOutputs(int width, int height)
{
var cameraManager = (CameraManager)Context.GetSystemService(Context.CameraService);
try
{
for (var i = 0; i < cameraManager.GetCameraIdList().Length; i++)
{
var cameraId = cameraManager.GetCameraIdList()[i];
CameraCharacteristics characteristics = cameraManager.GetCameraCharacteristics(cameraId);
// We don't use a front facing camera in this sample.
var facing = (Integer)characteristics.Get(CameraCharacteristics.LensFacing);
if (facing != null && facing == (Integer.ValueOf((int)LensFacing.Front)))
{
continue;
}
var map = (StreamConfigurationMap)characteristics.Get(CameraCharacteristics.ScalerStreamConfigurationMap);
if (map == null)
{
continue;
}
// For still image captures, we use the largest available size.
Size largest = (Size)Collections.Max(Arrays.AsList(map.GetOutputSizes((int)ImageFormatType.Jpeg)),
new Camera2Basic.CompareSizesByArea());
mImageReader = ImageReader.NewInstance(largest.Width, largest.Height, ImageFormatType.Jpeg, 2);
mImageReader.SetOnImageAvailableListener(mOnImageAvailableListener, BackgroundHandler);
var windowManager = Context.GetSystemService(Context.WindowService).JavaCast <IWindowManager>();
// Find out if we need to swap dimension to get the preview size relative to sensor
// coordinate.
var displayRotation = windowManager.DefaultDisplay.Rotation;
//noinspection ConstantConditions
mSensorOrientation = (int)characteristics.Get(CameraCharacteristics.SensorOrientation);
bool swappedDimensions = false;
switch (displayRotation)
{
case SurfaceOrientation.Rotation0:
case SurfaceOrientation.Rotation180:
if (mSensorOrientation == 90 || mSensorOrientation == 270)
{
swappedDimensions = true;
}
break;
case SurfaceOrientation.Rotation90:
case SurfaceOrientation.Rotation270:
if (mSensorOrientation == 0 || mSensorOrientation == 180)
{
swappedDimensions = true;
}
break;
default:
Log.Error("CameraPreview", "Display rotation is invalid: " + displayRotation);
break;
}
Point displaySize = new Point();
windowManager.DefaultDisplay.GetSize(displaySize);
var rotatedPreviewWidth = width;
var rotatedPreviewHeight = height;
var maxPreviewWidth = displaySize.X;
var maxPreviewHeight = displaySize.Y;
if (swappedDimensions)
{
rotatedPreviewWidth = height;
rotatedPreviewHeight = width;
maxPreviewWidth = displaySize.Y;
maxPreviewHeight = displaySize.X;
}
if (maxPreviewWidth > MAX_PREVIEW_WIDTH)
{
maxPreviewWidth = MAX_PREVIEW_WIDTH;
}
if (maxPreviewHeight > MAX_PREVIEW_HEIGHT)
{
maxPreviewHeight = MAX_PREVIEW_HEIGHT;
}
// Danger, W.R.! Attempting to use too large a preview size could exceed the camera
// bus' bandwidth limitation, resulting in gorgeous previews but the storage of
// garbage capture data.
mPreviewSize = ChooseOptimalSize(map.GetOutputSizes(Class.FromType(typeof(SurfaceTexture))),
rotatedPreviewWidth, rotatedPreviewHeight, maxPreviewWidth,
maxPreviewHeight, largest);
// We fit the aspect ratio of TextureView to the size of preview we picked.
var orientation = Resources.Configuration.Orientation;
if (orientation == Android.Content.Res.Orientation.Landscape)
{
mTextureView.SetAspectRatio(mPreviewSize.Width, mPreviewSize.Height);
}
else
{
mTextureView.SetAspectRatio(mPreviewSize.Height, mPreviewSize.Width);
}
// Check if the flash is supported.
var available = characteristics.Get(CameraCharacteristics.FlashInfoAvailable).JavaCast <Java.Lang.Boolean>();
if (available == null)
{
mFlashSupported = false;
}
else
{
mFlashSupported = (bool)available;
}
mCameraId = cameraId;
return;
}
}
catch (CameraAccessException e)
{
e.PrintStackTrace();
}
catch (NullPointerException e)
{
// Currently an NPE is thrown when the Camera2API is used but not supported on the
// device this code runs.
//ErrorDialog.NewInstance(GetString(Resource.String.camera_error)).Show(ChildFragmentManager, FRAGMENT_DIALOG);
Log.Error("CameraPreviewAlt", "SetUpCameraOutputs: " + e.ToString());
}
}
