public void ShutdownCamera()
{
if (camera == null)
{
return;
}
try
{
try
{
camera.StopPreview();
camera.SetNonMarshalingPreviewCallback(null);
camera.SetPreviewDisplay(null);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.ToString());
}
camera.Release();
camera = null;
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(e.ToString());
}
}
public void ShutdownCamera()
{
if (Camera == null)
{
return;
}
// camera release logic takes about 0.005 sec so there is no need in async releasing
var perf = PerformanceCounter.Start();
try
{
try
{
//Camera.SetPreviewCallback(null);
Camera.SetPreviewDisplay(null);
Camera.StopPreview();
Camera.SetNonMarshalingPreviewCallback(null);
}
catch (Exception ex)
{
Android.Util.Log.Error(MobileBarcodeScanner.TAG, ex.ToString());
}
Camera.Release();
Camera = null;
}
catch (Exception e)
{
Android.Util.Log.Error(MobileBarcodeScanner.TAG, e.ToString());
}
PerformanceCounter.Stop(perf, "Shutdown camera took {0}ms");
}
public void SetupCamera()
{
if (Camera != null)
{
return;
}
var perf = PerformanceCounter.Start();
OpenCamera();
PerformanceCounter.Stop(perf, "Setup Camera took {0}ms");
if (Camera == null)
{
return;
}
perf = PerformanceCounter.Start();
ApplyCameraSettings();
try
{
Camera.SetPreviewDisplay(holder);
var previewParameters = Camera.GetParameters();
var previewSize = previewParameters.PreviewSize;
var bitsPerPixel = ImageFormat.GetBitsPerPixel(previewParameters.PreviewFormat);
var bufferSize = (previewSize.Width * previewSize.Height * bitsPerPixel) / 8;
const int NUM_PREVIEW_BUFFERS = 5;
for (uint i = 0; i < NUM_PREVIEW_BUFFERS; ++i)
{
using (var buffer = new FastJavaByteArray(bufferSize))
Camera.AddCallbackBuffer(buffer);
}
Camera.StartPreview();
Camera.SetNonMarshalingPreviewCallback(cameraEventListener);
// Docs suggest if Auto or Macro modes, we should invoke AutoFocus at least once
var currentFocusMode = Camera.GetParameters().FocusMode;
if (currentFocusMode == Camera.Parameters.FocusModeAuto ||
currentFocusMode == Camera.Parameters.FocusModeMacro)
{
AutoFocus();
}
}
catch (Exception ex)
{
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, ex.ToString());
return;
}
finally
{
PerformanceCounter.Stop(perf, "Setup Camera Parameters took {0}ms");
}
}
