Still trying to figure this out, but not getting anywhere on it.

Does taking a picture using the camera only require creating the
Camera.PictureCallback for onPictureTaken() and passing it into
Camera.takePicture() as an input?  Or do you have to stop the preview,
lock the canvas, and convert/extract data from there to get it into a
writable form?

I'm fine with the first one, but completely confused as to how to do
the latter.

Also, is taking pictures in the emulator functional or not?  I tried
to run CameraApiTest and it crashes hard whenever I hit spacebar, even
though I have an SD card instantiated.
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