Android.mk Include other projects

Question

Explanations

The goal of my question is to know how to create a Android.mk (makefile) that can build and run, this structures of project below.

Answer 1

1. No. It needn't.
2. Yes. You can reference to the aosp source under "packages/apps/Dialer". It is just meets the situation you declare. Dialer includes "packages/app/ContactsCommon" and "packages/app/InCallUI". You'll find that there is no Android.mk under InCallUI's path.