public void RunPrecaptureSequence()
{
try
{
// This is how to tell the camera to trigger.
PreviewRequestBuilder.Set(CaptureRequest.ControlAePrecaptureTrigger, (int)ControlAEPrecaptureTrigger.Start);
// Tell #mCaptureCallback to wait for the precapture sequence to be set.
State = CameraState.WaitingPrecapture;
CaptureSession.Capture(PreviewRequestBuilder.Build(), CaptureCallback, BackgroundHandler);
}
catch (CameraAccessException e)
{
e.PrintStackTrace();
}
}
public void LockFocus()
{
try
{
// This is how to tell the camera to lock focus.
PreviewRequestBuilder.Set(CaptureRequest.ControlAfTrigger, (int)ControlAFTrigger.Start);
// Tell #mCaptureCallback to wait for the lock.
State = CameraState.WaitingLock;
CaptureSession.Capture(PreviewRequestBuilder.Build(), CaptureCallback, BackgroundHandler);
}
catch (CameraAccessException e)
{
e.PrintStackTrace();
}
}
/// <summary>
/// Lock the focus as the first step for a still image capture.
/// </summary>
private void LockFocus()
{
try
{
// This is how to tell the camera to lock focus.
PreviewRequestBuilder.Set(CaptureRequest.ControlAfTrigger, (int)ControlAFTrigger.Start);
// Tell #CaptureCallback to wait for the lock.
CurrentCameraState = STATE_WAITING_LOCK;
// this will kick off the image-capture pipeline
CaptureSession.Capture(PreviewRequestBuilder.Build(), CaptureCallback, BackgroundHandler);
}
catch (CameraAccessException e)
{
e.PrintStackTrace();
}
}
public void UnlockFocus()
{
try
{
// Reset the auto-focus trigger
PreviewRequestBuilder.Set(CaptureRequest.ControlAfTrigger, (int)ControlAFTrigger.Cancel);
SetAutoFlash(PreviewRequestBuilder);
CaptureSession.Capture(PreviewRequestBuilder.Build(), CaptureCallback, BackgroundHandler);
// After this, the camera will go back to the normal state of preview.
State = CameraState.Preview;
CaptureSession.SetRepeatingRequest(PreviewRequest, CaptureCallback, BackgroundHandler);
}
catch (CameraAccessException e)
{
e.PrintStackTrace();
}
}