private void FindAndOpenCamera()
{
bool cameraPermissions = CheckCameraPermissions();
if (!cameraPermissions)
{
return;
}
string errorMessage = "Unknown error";
bool foundCamera = false;
IListenableFuture cameraProviderFuture = ProcessCameraProvider.GetInstance(this);
cameraProviderFuture.AddListener(new Runnable(() =>
{
// Camera provider is now guaranteed to be available
mCameraProvider = cameraProviderFuture.Get() as ProcessCameraProvider;
try
{
// Find first back-facing camera that has necessary capability.
CameraSelector cameraSelector = new CameraSelector.Builder().RequireLensFacing((int)mLensFacing).Build();
// Find a good size for output - largest 4:3 aspect ratio that's less than 720p
Preview.Builder previewBuilder = new Preview.Builder()
.SetTargetAspectRatio(AspectRatio.Ratio43);
Camera2Interop.Extender previewExtender = new Camera2Interop.Extender(previewBuilder);
previewExtender.SetSessionCaptureCallback(mCaptureCallback);
Preview preview = previewBuilder.Build();
// Must unbind the use-cases before rebinding them
mCameraProvider.UnbindAll();
ICamera camera = mCameraProvider.BindToLifecycle(
this as ILifecycleOwner, cameraSelector, preview);
if (camera != null)
{
// Found suitable camera - get info, open, and set up outputs
mCameraInfo = camera.CameraInfo;
mCameraControl = camera.CameraControl;
preview.SetSurfaceProvider(this);
foundCamera = true;
}
if (!foundCamera)
{
errorMessage = GetString(Resource.String.camera_no_good);
}
SwitchRenderMode(0);
}
catch (CameraAccessException e)
{
errorMessage = GetErrorString(e);
}
if (!foundCamera)
{
ShowErrorDialog(errorMessage);
}
}), ContextCompat.GetMainExecutor(this));
}
