How to build AOSP app?

Question

I am trying to build the Camera App from AOSP.

I am on UBUNTU 14.04.

I followed the guide in the official documentation. At the end I execute

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Answer 1

'make camera2' will build all the dependencies and then the actual camera2 app, which will be placed somewhere in out/, depending on your selected lunch target.

Once you've built it once to get the dependencies, mmm packages/apps/Camera2 will be a fast incremental compile, but it doesn't on its own build the dependencies.