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React Native Quickstart Guide

Getting started

Hello there! In this guide, we'll build a video conferencing application using our React Native SDK. We'll be using functional components with the powerful hooks provided by our SDK and build an app where you can have video call with your friends.


To get started you should be familiar with basics of React Native.

Installing the dependencies

npm install --save @100mslive/react-native-hms


For Android Permissions

Add following permissions in AndroidManifest.xml

<uses-feature android:name="android.hardware.camera"/> <uses-feature android:name="android.hardware.camera.autofocus"/> <uses-permission android:name="android.permission.CAMERA"/> <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/> <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/> <uses-permission android:name="android.permission.RECORD_AUDIO"/> <uses-permission android:name="android.permission.BLUETOOTH"/> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

You will also need to request Camera and Record Audio permissions at runtime before you join a call or display a preview. Please follow Android Documentation for runtime permissions.

For iOS Permissions

Add following lines in Info.plist file

<key>NSCameraUsageDescription</key> <string>Please allow access to Camera to enable video conferencing</string> <key>NSMicrophoneUsageDescription</key> <string>Please allow access to Microphone to enable video conferencing</string> <key>NSLocalNetworkUsageDescription</key> <string>Please allow access to network usage to enable video conferencing</string>


  • Room: When we join a conference call, the participants are said to be in a video call room.
  • Peer: A participant in the video call. You are the local peer while others are remote peers.
  • Track: Media. There are two types of track a peer can have - audio and video.

Initializing the SDK

Call the function given below to initialise the SDK

import { HMSSDK } from '@100mslive/react-native-hms'; const hmsInstance = await HMSSDK.build();

This function will return the instance of HMSSDK that will be used for calling various functions and accessing data.

Add event listeners

Add event listeners for all the events you want updates from such as onPreview, onJoin, onError etc. The actions can be found in HMSUpdateListenerActions class.

The event handlers are the way of handling any update happening in hms. It is advised to attach all the event listeners so you don't miss any update.

import { HMSUpdateListenerActions } from 'react-native-hms'; // instance acquired from build() method hmsInstance.addEventListener( HMSUpdateListenerActions.ON_PREVIEW, onPreview // function that will be called on Preview success ); hmsInstance.addEventListener(HMSUpdateListenerActions.ON_ERROR, onError); hmsInstance.addEventListener(HMSUpdateListenerActions.ON_JOIN, onJoin);

Joining a room

To join a room 3 fields are required:

  • username: The name of the user. This is the value that will be set on the peer object and be visible to everyone connected to the room.
  • authToken: A client-side token that is used to authenticate the user. You can read about how to generate this token here.
  • userID: A unique ID that will be used to identify user.
  • roomID (optional): The ID of the room that you wanna join
import { HMSConfig } from 'react-native-hms'; // instance acquired from build() method const HmsConfig = new HMSConfig({ authToken, userID, roomID, userName }); hmsInstance.preview(HmsConfig); // to start preview // or hmsInstance.join(HmsConfig); // to join a room

Leaving the room

Before we go ahead with adding video, let us add a way to leave the room as well. We can call the leave method on hmsActions to leave the room.

Once you're done with a call and want to exit, call leave on the HMSSDK instance you created to join it. Also you can always acquire instance of HMS using build() method.


Render video

Let us next add a way to show a tile for every participant in the room. We use HmsView component to render video on screen. This component takes trackId and scaleType of HMSVideoTrack and renders the corresponding track. The prop scaleType can be selected from HMSVideoViewMode as required. We can also add mirror a boolean prop as true to flip videos horizontally. Here is a code snippet explaining the way to link a videoTrack to HmsView.

import { HmsView, HMSVideoViewMode } from 'react-native-hms'; const styles = StyleSheet.create({ hmsView: { height: '100%', width: '100%' } }); <HmsView style={styles.hmsView} trackId={trackId} mirror={true} scaleType={HMSVideoViewMode.ASPECT_FILL} />;

There are 2 types of Peers - a localPeer & remotePeers. To extract trackId from peers we can use following code snippet.

const localTrackId = hmsInstance.localPeer.videoTrack.trackId; const remoteTrackId = hmsInstance.remotePeers[index].videoTrack.trackId;

These track IDs can directly be passed to HmsView component

A Pro tip: for fastest updates we can use ON_PEER_UPDATE and ON_TRACK_UPDATE listeners, these listeners get updated localPeer and remotePeers whenever there is any event related to these values.

HmsInstance.addEventListener(HMSUpdateListenerActions.ON_PEER_UPDATE, onPeerListener); HmsInstance.addEventListener(HMSUpdateListenerActions.ON_TRACK_UPDATE, onTrackListener); const onPeerListener = ({ remotePeers, localPeer }: { peer: HMSPeer, room?: HMSRoom, type?: HMSPeerUpdate, localPeer: HMSLocalPeer, remotePeers: HMSRemotePeer[] }) => { updateVideoIds(remotePeers, localPeer); // this function can be used to update local and remotePeers on React-Native side }; const onTrackListener = ({ remotePeers, localPeer }: { peer: HMSPeer, track: HMSTrack, room?: HMSRoom, type?: HMSTrackUpdate, localPeer: HMSLocalPeer, remotePeers: HMSRemotePeer[] }) => { updateVideoIds(remotePeers, localPeer); };

Mute/Unmute local Audio/Video tracks

Mute is something that applies to both audio and video. When you mute audio, you can't be heard by other people. When you mute video, you will not be broadcasting your video to other people.

It can be invoked only on local (you) peers' audio or video tracks.

You get a reference to your own local peer from localPeer on HMSSDK instance.

// instance acquired from build() method hmsInstance.localPeer.localAudioTrack().setMute(true); // audio track hmsInstance.localPeer.localVideoTrack().setMute(true); // video track

You can checkout the 100ms React Native SDK Github repo which also contains a fully fledged Example app implementation here

In the 100ms Example App we have shown how to setup the various listeners, what data to store in the redux and what all features you can implement.

We have also implemented multiple views which are commonly used. Checkout the videos & relevant code in the Example app.