Added code for Auto detect barcode without user tap

[mrigankdembla]

Hi ,

I saw an issue #94 according to which user asked to auto detect barcode without user interaction. So I have added switch/chechbox in the Main activity , which if selected will enable user to auto detect barcode and return its value.

I have made the changes in the following files by which if user wants to auto detect barcode, he/she can directly select switch/checkbox for auto detect on main activity and then barcode will be detected without tap and first detected barcode will be returned.

Please review the changes made in MainActivity,BarcodeCaptureActivity, BarcodeGraphicTracker and BarcodeTrackerFactory along with layout changes in activity_main.xml

Please review the changes made and tell me issues with it if any.

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[mrigankdembla]

I signed it!

[googlebot]

CLAs look good, thanks!

[mrigankdembla]

@claywilkinson please check this.. Thanks! :)

[pchx-zz]

Your changes are appearing as new files -- are you sure you've included the right file paths in your commit?

[alibitek]

@mrigankdembla The changes are commited incorrectly at the root of the project: https://github.com/googlesamples/android-vision/tree/76f6fe5193ad114f787c2863ca976fe9a485ecbf . The files should be placed in the appropriate subdirectory.

[cluelin]

Thanks! it's working great!

[wanamr87]

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