unity3d - ARToolkit for Unity on Android : Camera won't start, just black screen -

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i've been working on project artoolkit unity. built android apk. installed xiaomi device. when run app, following :

  1. it pops out small square camera on upper left corner
  2. it shows unity animation text usual
  3. it goes black forever

i've set permission app access phone's camera. how can solve matter?

do have phone's camera working? newbie way don't go harsh on me.

notes : i've tried build scene without artoolkit android apk. worked fine , no black screen.

sorry if english isn't good. appreciated, before.

just guess... artoolkit android on startup attempts contact web-server on internet download camera parameters. i've noticed if phone not have internet access, you'll see black screen quite while (at least 30 seconds i've seen) until http request times out. can see if run android studio studio , view logs app. unfortunately @ moment there appears no switch turn off. see:

http://artoolkit.org/community/forums/viewtopic.php?f=26&t=9441


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