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Quickstart

Updated

Rapidly develop and easily enhance your social, work, and educational apps with face-to-face interaction.

This page provides a step-by-step guide on how to create a basic Broadcast Streaming app using the Agora Video SDK.

Understand the tech

To start a Broadcast Streaming session, implement the following steps in your app:

  • Initialize the Agora Engine: Before calling other APIs, create and initialize an Agora Engine instance.

  • Join a channel: Call methods to create and join a channel.

    • Join as a host: A live streaming event has one or more hosts. A host publishes audio and video to the channel. Hosts can also subscribe to streams from other hosts.

    • Join as audience: Audience members can only subscribe to streams published by hosts.

  • Send and receive audio and video: Hosts publish streams to the channel. Audience members subscribe to audio and video streams published by hosts.

Prerequisites

  • React Native 0.60 or later. For more information, see Get Started with React Native.
  • Node 16 or later For your target platform, prepare the following:
  • A machine running macOS, Windows, or Linux
  • Java Development Kit (JDK) 11 or later
  • Latest version of Android Studio
  • A physical or virtual mobile device running Android 5.0 or later

Set up your project

This section shows you how to set up your React Native project and install the Agora Video SDK.

Create a project

To create a new application using React Native Community CLI, see Get Started Without a Framework.

Install the SDK

Download and add the Agora Video SDK to your React Native project. Choose either of the following methods:

npm In your project folder, execute the following command:

npm i --save react-native-agora

yarn In your project folder, execute the following commands:

# Install yarn
npm install -g yarn

# Use yarn to download Agora React Native SDK
yarn add react-native-agora

React Native 0.60.0 and later support automatic linking of native modules. Manual linking is not recommended. See Autolinking for details

Implement Broadcast Streaming

This section guides you through the implementation of basic real-time audio and video interaction in your app.

The following figure illustrates the essential steps:

This guide includes complete sample code that demonstrates implementing basic real-time interaction. To understand the core API calls in the sample code, review the following implementation steps and use the code in your App.tsx file.

Import dependencies

Add the required Agora dependencies to your app.

import {
  createAgoraRtcEngine,
  ChannelProfileType,
  ClientRoleType,
  AudienceLatencyLevelType,
  IRtcEngine,
  RtcSurfaceView,
  RtcConnection,
  IRtcEngineEventHandler,
} from 'react-native-agora';

Initialize the engine

For real-time communication, call createAgoraRtcEngine to create an RtcEngine instance, and then initialize the engine using RtcEngineContext to specify the App ID.

const appId = '<-- Insert app ID -->';

const setupVideoSDKEngine = async () => {
  if (Platform.OS === 'android') { await getPermission(); }
  agoraEngineRef.current = createAgoraRtcEngine();
  const agoraEngine = agoraEngineRef.current;
  await agoraEngine.initialize({ appId: appId });
};

Join a channel

To join a channel, call joinChannel with the following parameters:

  • Channel name: The name of the channel to join. Clients that pass the same channel name join the same channel. If a channel with the specified name does not exist, it is created when the first user joins.

  • Authentication token: A dynamic key that authenticates a user when the client joins a channel. In a production environment, you obtain a token from a token server in your security infrastructure. For the purpose of this guide Generate a temporary token.

  • User ID: A 32-bit signed integer that identifies a user in the channel. You can specify a unique user ID for each user yourself. If you set the user ID to 0 when joining a channel, the SDK generates a random number for the user ID and returns the value in the onJoinChannelSuccess callback.

  • Channel media options: Configure ChannelMediaOptions to define publishing and subscription settings, optimize performance for your specific use-case, and set optional parameters.

For Broadcast Streaming, set the channelProfile to ChannelProfileLiveBroadcasting, the clientRoleType to ClientRoleBroadcaster (host) or ClientRoleAudience, and the audienceLatencyLevel to audienceLatencyLevelLowLatency.

const token = '<-- Insert token -->';
const channelName = '<-- Insert channel name -->';
const localUid = 0; // Local user UID, no need to modify

// Define the join method called after clicking the join channel button
const join = async () => {
  if (isJoined) {
    return;
  }
  if (isHost) {
    // Join the channel as a broadcaster
    agoraEngineRef.current?.joinChannel(token, channelName, localUid, {
      // Set channel profile to live broadcast
      channelProfile: ChannelProfileType.ChannelProfileLiveBroadcasting,
      // Set user role to broadcaster
      clientRoleType: ClientRoleType.ClientRoleBroadcaster,
      // Publish audio collected by the microphone
      publishMicrophoneTrack: true,
      // Publish video collected by the camera
      publishCameraTrack: true,
      // Automatically subscribe to all audio streams
      autoSubscribeAudio: true,
      // Automatically subscribe to all video streams
      autoSubscribeVideo: true,
    });
  } else {
    // Join the channel as an audience
    agoraEngineRef.current?.joinChannel(token, channelName, localUid, {
      // Set channel profile to live broadcast
      channelProfile: ChannelProfileType.ChannelProfileLiveBroadcasting,
      // Set user role to audience
      clientRoleType: ClientRoleType.ClientRoleAudience,
      // Do not publish audio collected by the microphone
      publishMicrophoneTrack: false,
      // Do not publish video collected by the camera
      publishCameraTrack: false,
      // Automatically subscribe to all audio streams
      autoSubscribeAudio: true,
      // Automatically subscribe to all video streams
      autoSubscribeVideo: true,',
      // Change the delay level of the audience to achieve ultra-fast live broadcast
      audienceLatencyLevel: AudienceLatencyLevelType.AudienceLatencyLevelLowLatency,
    });
  }
};

Since the Agora Engine runs locally, reloading the app using the Metro bundler may cause the engine reference to be lost, preventing channel joining. To resolve this issue, restart the app.

Subscribe to Video SDK events

The Video SDK provides an interface for subscribing to channel events. To use it, create an instance of IRtcEngineEventHandler and implement the event methods you want to handle. Call registerEventHandler to register your custom event handler.

const [remoteUid, setRsemoteUid] = useState(0); // Uid of the remote user

const setupEventHandler = () => {
  eventHandler.current = {
    // Triggered when the local user successfully joins a channel
    onJoinChannelSuccess: () => {
      setMessage('Successfully joined channel: ' + channelName);
      setupLocalVideo();
      setIsJoined(true);
    },
    // Triggered when a remote user joins the channel
    onUserJoined: (_connection: RtcConnection, uid: number) => {
      setMessage('Remote user ' + uid + ' joined');
      setRemoteUid(uid);
    },
    // Triggered when a remote user leaves the channel
    onUserOffline: (_connection: RtcConnection, uid: number) => {
      setMessage('Remote user ' + uid + ' left the channel');
      setRemoteUid(uid);
    },
  };
  // Register the event handler
  agoraEngineRef.current?.registerEventHandler(eventHandler.current);
};

To ensure that you receive all Video SDK events, register the event handler before joining a channel.

Enable the video module

Call enableVideo to activate the video module, and use startPreview to enable the local video preview.

const setupLocalVideo = () => {
  agoraEngineRef.current?.enableVideo();
  agoraEngineRef.current?.startPreview();
};

Display the local video

To display the local user's video stream, use the RtcSurfaceView component. Set the uid to 0 and style the video container.

<React.Fragment key={0}>
  <RtcSurfaceView canvas={{ uid: 0 }} style={ width: '90%', height: 200 } />
</React.Fragment>

Display remote video

To display the remote user's video, use the RtcSurfaceView component. Pass the remoteUid of the remote user to the component and set the desired style for the video container.

<React.Fragment key={remoteUid}>
  <RtcSurfaceView
    canvas={{ uid: remoteUid }}
    style={ width: '90%', height: 200 }
  />
</React.Fragment>

Handle permissions

To access the camera and microphone, ensure that the user grants the necessary permissions when the app starts.

On Android devices, pop up a prompt box to obtain permission to use the camera and microphone.

// Import components related to Android device permissions
import {PermissionsAndroid, Platform} from 'react-native';

const getPermission = async () => {
if (Platform.OS === 'android') {
  await PermissionsAndroid.requestMultiple([
    PermissionsAndroid.PERMISSIONS.RECORD_AUDIO,
    PermissionsAndroid.PERMISSIONS.CAMERA,
  ]);
}
};

Leave the channel

To exit a Broadcast Streaming channel, call leaveChannel.

const leave = () => {
  // Leave the channel
  agoraEngineRef.current?.leaveChannel();
  setIsJoined(false);
};

Clean up resources

Before closing your app, unregister the event handler and call release to free up resources.

const cleanupAgoraEngine = () => {
  return () => {
    agoraEngineRef.current?.unregisterEventHandler(eventHandler.current!);
    agoraEngineRef.current?.release();
  };
};

After calling release, methods and callbacks of the SDK are no longer available. To use the SDK functions again, create a new engine instance.

Complete sample code

A complete code sample demonstrating the basic process of real-time interaction is provided for your reference. To use the sample code, copy the code into ProjectName/App.tsx to quickly implement the basic functionality.

Create a user interface

Design a user interface for your project based on your application use-case. A basic interface consists of two view frames to display local and remote videos. Add Join channel and Leave channel buttons to enable the user to join and leave a channel. To create such an interface, refer to the following code:

Sample code to create the user interface

import React, { useState } from 'react';

// Import user interface elements
import {
  SafeAreaView,
  ScrollView,
  StyleSheet,
  Text,
  View,
  Switch,
} from 'react-native';

const localUid = 0; // Local user Uid, no need to modify

const App = () => {
  const [isJoined, setIsJoined] = useState(false); // Whether the local user has joined the channel
  const [isHost, setIsHost] = useState(true); // User role
  const [remoteUid, setRemoteUid] = useState(0); // Uid of the remote user
  const [message, setMessage] = useState(''); // User prompt message

  // Render user interface
  return (
    <SafeAreaView style={styles.main}>
      <Text style={styles.head}>Agora Video SDK Quickstart</Text>
      <View style={styles.btnContainer}>
        <Text onPress={join} style={styles.button}>
          Join Channel
        </Text>
        <Text onPress={leave} style={styles.button}>
          Leave Channel
        </Text>
      </View>
      <View style={styles.btnContainer}>
        <Text>Audience</Text>
        <Switch
          onValueChange={switchValue => {
            setIsHost(switchValue);
            if (isJoined) {
              leave();
            }
          }}
          value={isHost}
        />
        <Text>Host</Text>
      </View>
      <ScrollView
        style={styles.scroll}
        contentContainerStyle={styles.scrollContainer}>
        {isJoined && isHost ? (
          <React.Fragment key={localUid}>
            <Text>Local user uid: {localUid}</Text>
          </React.Fragment>
        ) : (
          <Text>Join a channel</Text>
        )}
        {isJoined && remoteUid !== 0 ? (
          <React.Fragment key={remoteUid}>
            <Text>Remote user uid: {remoteUid}</Text>
          </React.Fragment>
        ) : (
          <Text>{isJoined && !isHost ? 'Waiting for remote user to join' : ''}</Text>
        )}
        <Text style={styles.info}>{message}</Text>
      </ScrollView>
    </SafeAreaView>
  );
};

// Define user interface styles
const styles = StyleSheet.create({
  button: {
    paddingHorizontal: 25,
    paddingVertical: 4,
    fontWeight: 'bold',
    color: '#ffffff',
    backgroundColor: '#0055cc',
    margin: 5,
  },
  main: { flex: 1, alignItems: 'center' },
  scroll: { flex: 1, backgroundColor: '#ddeeff', width: '100%' },
  scrollContainer: { alignItems: 'center' },
  videoView: { width: '90%', height: 200 },
  btnContainer: { flexDirection: 'row', justifyContent: 'center' },
  head: { fontSize: 20 },
  info: { backgroundColor: '#ffffe0', paddingHorizontal: 8, color: '#0000ff' },
});

export default App;

Test the sample code

Take the following steps to test the sample code:

  1. Update the values for appId, token, and channelName in your code.

  2. Run the app.

    Some simulators may not support all the functions of this project. Best practice is to run the project on a physical device.

To run the app on an Android device:

  1. Turn on the developer options of the Android device and connect the Android device to the computer through a USB cable.

  2. In the project root directory, execute npx react-native run-android.

For detailed steps on running the app on a real Android or iOS device, please refer to Running On Device.

  1. Launch the app and click the Join channel button to join a channel.

  2. Invite a friend to install and run the app on a second device. Alternatively, use the Web demo to join the same channel. Once your friend joins the channel, you can see and hear each other.

Reference

This section contains content that completes the information on this page, or points you to documentation that explains other aspects to this product.

  • If a firewall is deployed in your network environment, refer to Connect with Cloud Proxy to use Agora services normally.

Next steps

After implementing the quickstart sample, read the following documents to learn more:

  • To ensure communication security in a test or production environment, best practice is to obtain and use a token from an authentication server. For details, see Secure authentication with tokens.

Sample project

Agora provides open source sample projects on GitHub for your reference. Download or view the JoinChannelVideo project for a more detailed example.

API reference

Frequently asked questions

See also

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