fix start/stop preview

[constambeys]

No description provided.

[pedroSG94]

Hello,

Can you tell me the reason to change it?
This changes provide side effects that I don't like in Camera1Base. For example in stopPreview, if you call is while streaming/recording the camera will be stoppped.

[constambeys]

Hi,

I liked your project, is very good, and I use it with some modifications to monitor my house from a mobile device.

However the last time I used it the phone was getting very hot because it was processing the camera feed continuously.

So I call stopPreview and startPreview every time I connect/disconnect but these methods did not work, so I made this change !

I think this change is logical because the only variable that changes in these methods is the onPreview.

Thanks
Timotheos Constambeys

[pedroSG94]

I see but this change the backwards compatibility so I think that the best idea is create a new method for it.

[pedroSG94]

Hello,

I fixed it. To allow this feature I added the method stopCamera.
stopCamera method is the same that stopPreview but allow do it while streaming/recording
stopPreview keep the same functionality for backwards compatibility

Thank your for the PR