Why Red rectangle around the android UI

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Why Red rectangle around the android UI

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conteczxy
Contributor III

Hi,

I found sometimes, there is a red rectangle around the android UI, like this,

device.PNG

It shows suddently, and then dispear very quickly. what is it used for?

Why it show? My platform is android 4.4.

Thanks,

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rickchu
Contributor IV

Its because Android compilation as engineer mode; the red rectangle is displayed for debug usage.
you can change TARGET_BUILD_VARIANT=user (or userdebug) to make red rectangle disappear.