Android WebRTC Video Call App

A peer-to-peer video & audio calling Android app built in Kotlin using the open-source WebRTC SDK.
No third-party media servers—just WebRTC + a custom signaling server.

About

This Android application demonstrates a complete WebRTC peer-to-peer video & audio call using the official io.github.webrtc-sdk:android library. A minimal Node.js signaling server (WebRTCLocalServer) is used to exchange SDP offers/answers and ICE candidates over WebSocket.

Features

• 🎥 Two-way video & audio
• 🔄 Call, accept/decline, hang up
• 🔒 PeerConnection with Unified Plan semantics
• 🔧 Uses only open-source WebRTC (no commercial SDKs)
• 🔗 Custom WebSocket signaling

Demo

Getting Started

Prerequisites

• Android Studio
• Android device or emulator (API 21+)
• A running signaling server (see below)

Setup & Run

1. Signaling server
   Before running the Android app, you need a signaling server.
   Check out and start the server here:
   👉 WebRTC Local Server
   Follow its README to install and run on ws://YOUR_SERVER_IP:8080.

2. Android client

   • Open this project in Android Studio and let it sync Gradle.
   • Build & install on two devices or emulators.
   • Grant camera & microphone permissions when prompted.
   • Tap Call on Device A, accept on Device B, and hang up when done.

Configuration

You must point the app to your signaling server’s WebSocket URL. In MainActivity.kt, update the connect call:

// MainActivity.kt, inside initWebRTC()
signalingClient.connect(
    "room1",
    "ws://YOUR_SERVER_IP:8080" // ← replace with your actual server IP or domain
)