Chat and Video Call Application

Project Overview

This project aims to create a communication application with features like WhatsApp in terms of chat and video call functionality on the Android platform. As an Android Developer, the main challenges centered on three technical aspects: Socket Connection, WebRTC Integration, and Incoming Calls & Consistent Notifications.

Project Duration: December 2019 - July 2020

Role : Android Developer

User Interface Applicaiton

Home Page,Chat Interface Screenshot,Video Call Screenshot

View Screenshots

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Disclaimer

All product names, logos, and brands are anonymized. Screenshots are used solely to demonstrate technical experience.

Client-Side Challenge

This project aims to create a communication application, features like WhatsApp, on the Android platform. As an Android Developer, the main challenges center on three technical aspects:

• Socket Connection

  • Implement a stable Socket.IO client on Android, capable of handling automatic reconnections and maintaining persistent connections without excessive battery drain.

  • Ensure real-time UI updates (typing indicators, read/delivered status) with safe and efficient threading management.

• WebRTC Integration

  • Integrate the WebRTC SDK into an Android application, which is a low-level process sensitive to the application’s lifecycle.

  • Handle NAT Traversal and signaling (exchanging SDP and ICE candidates) with the Socket backend for successful call initiation.

  • handle services android to ensure the app can receive calls even when the app is closed.

• Incoming Calls & Consistent Notifications

  • Created a reliable notification mechanism for incoming calls and new messages using FCM High Priority, and managed it through a Foreground Service to guarantee call reception even when the app is closed.

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My Contribution

I was fully responsible for the implementation of the real-time chat and video call features on the Android side, working closely with the backend team and android engineers.

• Real-Time Chat Implementation (Socket Integration)

  • Socket Abstraction Layer: Designed SocketManager as a Singleton Service/Repository to manage a single persistent Socket connection across the app, ensuring reusability and consistency.

• Video/Voice Call Implementation (WebRTC SDK)

  • SDK Integration: Successfully integrating the Android WebRTC SDK, adapting the configuration for various Android device codecs and resolutions.

  • Signaling Protocol: Creating Android logic to send and receive SDP signals and ICE Candidates over the connected Socket. * Key Focus: Translates signals from the backend into WebRTC Peer Connection commands (createOffer, createAnswer, addIceCandidate) on the mobile side.