public void StartPreview()
{
try
{
var numberOfCameras = Camera.NumberOfCameras;
int? rearFacingCameraId = null;
// Find the ID of the default camera
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
for (int i = 0; i < numberOfCameras; i++)
{
Camera.GetCameraInfo(i, cameraInfo);
if (cameraInfo.Facing == CameraFacing.Back)
{
rearFacingCameraId = i;
}
}
if (rearFacingCameraId.HasValue)
{
camera = Camera.Open(rearFacingCameraId.Value);
if (cameraPreview != null)
{
cameraPreview.PreviewCamera = camera;
}
}
}
catch (CameraAccessException ex)
{
}
catch (NullPointerException)
{
}
catch (System.Exception ex)
{
}
}
/// <summary>
/// Open the camera.
/// </summary>
/// <returns>The opened camera.</returns>
private Camera OpenCameraFunc(out int cameraOrientation)
{
Camera camera = null;
cameraOrientation = 0;
var cameraInfo = new Camera.CameraInfo();
int cameraCount = Camera.NumberOfCameras;
for (int camId = 0; camId < cameraCount; camId++)
{
Camera.GetCameraInfo(camId, cameraInfo);
if (cameraInfo.Facing == CameraFacing.Back)
{
try
{
camera = Camera.Open(camId);
cameraOrientation = cameraInfo.Orientation;
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Exception in OpenCamera {0}", ex, null);
}
}
}
return camera;
}
public override View OnCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
// Open an instance of the first camera and retrieve its info.
camera = GetCameraInstance (CAMERA_ID);
Camera.CameraInfo cameraInfo = null;
if (camera != null) {
// Get camera info only if the camera is available
cameraInfo = new Camera.CameraInfo ();
Camera.GetCameraInfo (CAMERA_ID, cameraInfo);
}
if (camera == null || cameraInfo == null) {
Toast.MakeText (Activity, "Camera is not available.", ToastLength.Short).Show ();
return inflater.Inflate (Resource.Layout.fragment_camera_unavailable, null);
}
View root = inflater.Inflate (Resource.Layout.fragment_camera, null);
// Get the rotation of the screen to adjust the preview image accordingly.
SurfaceOrientation displayRotation = Activity.WindowManager.DefaultDisplay.Rotation;
// Create the Preview view and set it as the content of this Activity.
cameraPreview = new CameraPreview (Activity, camera, cameraInfo, displayRotation);
var preview = root.FindViewById <FrameLayout> (Resource.Id.camera_preview);
preview.AddView (cameraPreview);
return root;
}
public CameraPreview (Context context, Camera camera, Camera.CameraInfo cameraInfo,
SurfaceOrientation displayOrientation) :
base (context)
{
// Do not initialize if no camera has been set
if (camera == null || cameraInfo == null)
return;
this.camera = camera;
this.cameraInfo = cameraInfo;
this.displayOrientation = displayOrientation;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
holder = Holder;
holder.AddCallback (this);
}
public override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate (savedInstanceState);
// Create a RelativeLayout container that will hold a SurfaceView,
// and set it as the content of our activity.
mPreview = new Preview (this.Activity);
// Find the total number of cameras available
mNumberOfCameras = Camera.NumberOfCameras;
// Find the ID of the default camera
Camera.CameraInfo cameraInfo = new Camera.CameraInfo ();
for (int i = 0; i < mNumberOfCameras; i++) {
Camera.GetCameraInfo (i, cameraInfo);
if (cameraInfo.Facing == Camera.CameraInfo.CameraFacingBack) {
mDefaultCameraId = i;
}
}
SetHasOptionsMenu (mNumberOfCameras > 1);
}
protected override void OnCreate (Bundle savedInstanceState)
{
base.OnCreate (savedInstanceState);
// Hide the window title and go fullscreen.
RequestWindowFeature (WindowFeatures.NoTitle);
Window.AddFlags (WindowManagerFlags.Fullscreen);
// Create our Preview view and set it as the content of our activity.
mPreview = new Preview (this);
SetContentView (mPreview);
// Find the total number of cameras available
numberOfCameras = Camera.NumberOfCameras;
// Find the ID of the default camera
Camera.CameraInfo cameraInfo = new Camera.CameraInfo ();
for (int i = 0; i < numberOfCameras; i++) {
Camera.GetCameraInfo (i, cameraInfo);
if (cameraInfo.Facing == CameraFacing.Back) {
defaultCameraId = i;
}
}
}
private bool CreateCamera(int cameraIndex)
{
#if !DEBUG
try
#endif
{
StopCamera();
_camera = Camera.Open(cameraIndex);
_camera.SetPreviewDisplay(_surfaceHolder);
if (OnCameraCreated != null)
{
if (_cameraInfo == null)
_cameraInfo = new Android.Hardware.Camera.CameraInfo();
Camera.GetCameraInfo(cameraIndex, _cameraInfo);
OnCameraCreated(this, new CameraInfoEventArgs(_camera, _cameraInfo));
}
}
#if !DEBUG
catch (Exception excpt)
{
_camera.Release();
_camera = null;
while (excpt.InnerException != null)
excpt = excpt.InnerException;
Report.Error(Context.PackageName, String.Format("Unable to create camera: {0}", excpt.Message));
return false;
// TODO: add more exception handling logic here
}
#endif
return true;
}
public CameraInfoEventArgs(Camera camera, Camera.CameraInfo cameraInfo)
{
_camera = camera;
_cameraInfo = cameraInfo;
}
