Application Type: Native 

Brief: I want android Application which records audio from phone mic and plays audio through speaker simultaneously with out echo/noise. App should works with all the latest android versions. 

Some Similar Apps/Websites:  
Speex library used for echo cancellation.

youtube link :
https://www.youtube.com/watch?v=e1-HwidHMy0

Features:

Designs: Create one activity when you click on button recording + playing should start  and again click on the button stop recording + playing.

Timeline: 1-2 Weeks

Send a Proposal if you can do it.