I will add a feature to your existing android application for just 5$. I am working on android application from the past three years. In the past three years I almost worked on every module on android , from material design to multi-threading , a back-end chat messaging service to front end chat conversation screen , I have experience in all of them. I can work fast by following best coding practices and stand behind my work. You can see my portfolio , also can provide more on demand.