coverage.em file is not generating

[SHUBHAM SALUNKHE]

Hi,

     I am trying to instrument java files to generate code coverage in AOSP. I have enabled following environment variables before build.

export EMMA_INSTRUMENT_FRAMEWORK=true
export EMMA_INSTRUMENT=true
export LOCAL_EMMA_INSTRUMENT=true

cov.ec file is generated, when i followed steps mentioned in link. but i am not able to generate coverage report from that & also coverage.em file is not generated. 

How to generate report from .ec? any link or tutorial will be helpful.

Thanks & Regards,

Shubham Salunkhe