Realtime Messaging SDK for React-Native Android

Realtime Cloud Messaging is a highly-scalable pub/sub message broker, allowing you to broadcast messages to millions of users, reliably and securely. It's all in the cloud so you don't need to manage servers.

React Native enables you to build world-class application experiences on native platforms using a consistent developer experience based on JavaScript and React.

More information can be found on the Realtime native Android SDK reference documentation.

Installation

• Create a new react-native project. Check react-native getting started

• Execute

     npm install --save react-native-realtimemessaging-android

• In android/settings.gradle

    ...
    include ':react-native-realtime-messaging-android'
    project(':react-native-realtime-messaging-android').projectDir = new File(settingsDir,'../node_modules/react-native-realtimemessaging-android/reactnativemessagingandroid')

• In android/app/build.gradle

    ...
    dependencies {
        ...
        compile project(':react-native-realtime-messaging-android')
    }

• Add new RealtimeMessagingPackage() to the getPackages() method return list in MainApplication.java.

    import co.realtime.reactnativemessagingandroid.RealtimeMessagingPackage; //<-- import
  
    public class MainApplication extends Application implements ReactApplication {
  
        ...
  
        @Override
        protected List<ReactPackage> getPackages() {
            return Arrays.<ReactPackage>asList(
                    new MainReactPackage(),
                    new RealtimeMessagingPackage() // <-- add RealtimeMessagingPackage object
            );
        }
  	   
        ...

• Drag PROJECT_DIR/node_modules/react-native-realtimemessaging-android/RCTRealtimeMessagingAndroid.js to the root of your project.

• If you want to use push notifications, set MainActivity extending RealtimePushNotificationActivity.

    import co.realtime.reactnativemessagingandroid.RealtimePushNotificationActivity;
  
    public class MainActivity extends RealtimePushNotificationActivity {
    ...
    }

You are ready to go.

RealtimeMessagingAndroid class reference

Import RealtimeMessaging to your project

import realtime from './RCTRealtimeMessagingAndroid';
var RCTRealtimeMessaging = new realtime();

Event handling

In order to get event notifications from the native SDK, the JavaScript interface has two methods for adding and removing event registration.

RTEventListener(notification, callBack: Function)

RTEventListener registers a given event name on the notification field and a given callback function to be fired when the event occurs.

Example:

import realtime from './RCTRealtimeMessagingAndroid';
var RCTRealtimeMessaging = new realtime();

RCTRealtimeMessaging.RTEventListener("onConnected",this._onConnected),

RTRemoveEventListener(notification)

RTRemoveEventListener removes an event registration. After this method when the event occurs the callback will not be fired.

Example:

import realtime from './RCTRealtimeMessagingAndroid';
var RCTRealtimeMessaging = new realtime();

RCTRealtimeMessaging.RTEventListener("onConnected",this._onConnected),
RCTRealtimeMessaging.RTRemoveEventListener("onConnected"),

Complete event list:

• onConnected - Occurs when the client connects

• onDisconnect - Occurs when the client disconnects

• onReconnect - Occurs when the client reconnects

• onReconnecting - Occurs when the client is attempting to reconnect

• onSubscribed - Occurs when the client has successfully subscribed a channel. The event notification data is {"channel":channel}

• onUnSubscribed - Occurs when the client has successfully unsubscribed a channel. The event notification data is {"channel":channel}

• onException - Occurs when there is an exception. The event notification data is {"error":error.localizedDescription}

• onMessage - Occurs when a message is received. The event notification data is {"message": message,"channel": channel}

• onMessageWithFilter - Occurs when a message is received using RTSubscribeWithFilter. The event notification data is {"message": message,"channel": channel, "filtered":true}, where the filtered property indicates wheter the server was able to successfully filter the message.

• onMessageWithBuffer - Fired when a message was received in the specified channel subscribed with the RTSubscribeWithBuffer.

  • channel - The channel where the message was received
  • seqId - The message sequence id
  • message - The message received

• onMessageWithOptions - Fired when a message was received in the specified channel subscribed with the RTSubscribeWithOptions

  • msgOptions - Dictionary where the message data was received

  • msgOptions = { channel, // Channel where the message was received seqId, // The message sequence id property filtered, // Indicates if server has filtered the message message // Content of the received message }

• onPresence - Gets the subscriptions in the specified channel and if active the first 100 unique connection metadata:

  • On success -> {"result": result}
  • On error -> {"error": error}

• onEnablePresence - Enables presence for the specified channel with the first 100 unique connection metadata:

  • On success -> {"result": result}
  • On error -> {"error": error}

• onDisablePresence - Disables presence for the specified channel:

  • On success -> {"result": result}
  • On error -> {"error": error}

Push notification handling

Configure your project for push notifications handling

To configure your react-native project to receive push notifications you must follow this guide for the Android platform.

Handling push notifications through javascript

For handling push notifications ( sent using the Realtime mobile push notifications REST API) we added the following event listener:

• RTPushNotificationListener(callBack: Function)

Example:

componentDidMount: function(){
	RCTRealtimeMessaging.RTCPushNotificationListener(this._onNotification);
},

_onNotification: function(data)
{
  this._log("Received notification: " + JSON.stringify(data));  
},

Methods

RTConnect(config)

Connects the client to Realtime server with the given configuration.

Parameters

• appkey - Realtime application key
• token - Authentication token
• connectionMetadata - Connection metadata string
• clusterUrl or url - The Realtime Messaging cluster or server URL
• projectId - The GCM project number, only required for push notifications usage

Example:

RCTRealtimeMessaging.RTEventListener("onConnected",function(){
	console.log('Connected to Realtime Messaging');
}),

RCTRealtimeMessaging.RTConnect(
{
  appKey:this.state.appKey,
  token:this.state.token,
  connectionMetadata:this.state.connectionMetadata,
  clusterUrl:this.state.clusterUrl
});

RTDisconnect()

Disconnects the client from the Realtime server.

Example:

RCTRealtimeMessaging.RTEventListener("onDisconnect", function(){
	console.log('Disconnected from Realtime Messaging');
}),

RCTRealtimeMessaging.RTDisconnect();

RTSubscribe(channel, subscribeOnReconnect: boolean)

Subscribes a pub/sub channel to receive messages.

Parameters

• channel - Channel name

• subscribeOnReconnected - Indicates whether the client should subscribe the channel when reconnected (if it was previously subscribed when connected).

Example:

RCTRealtimeMessaging.RTEventListener("onSubscribed", function(subscribedEvent){
	console.log('Subscribed channel: ' + subscribedEvent.channel);
}),

RCTRealtimeMessaging.RTSubscribe("MyChannel", true);

RTSubscribeWithFilter(channel, subscribeOnReconnect: boolean, filter)

Subscribes a channel using a filter, to receive only messages that validate the filter.

Parameters

• channel - Channel name

• subscribeOnReconnected - Indicates whether the client should subscribe to the channel when reconnected (if it was previously subscribed when connected).

• filter - Filter to apply to messages

Example:

RCTRealtimeMessaging.RTSubscribeWithFilter("MyChannel", true, "message.a = 1");

RTSubscribeWithOptions(options)

Subscribes to a channel to receive messages sent to it with given options.

Parameters

• options - The subscription options dictionary, EX: options = { channel, subscribeOnReconnected, // optional, default = true, withNotifications (Bool), // optional, default = false, use push notifications as in subscribeWithNotifications filter, // optional, default = "", the subscription filter as in subscribeWithFilter subscriberId // optional, default = "", the subscriberId as in subscribeWithBuffer }

Example:

var options = {
		"channel":"YOUR_CHANNEL_NAME", 
		"subscriberId":"CLIENT_SUBSCRIBER_ID", 
		"filter":"MESSAGE_FILTER"
		}
RCTRealtimeMessaging.RTSubscribeWithOptions(options);

RTSubscribeWithBuffer(channel, subscriberId)

Subscribes to a channel to receive messages published to it.

Parameters

• channel - The channel name.
• subscriberId - The subscriberId associated to the channel.

Example:

RCTRealtimeMessaging.RTSubscribeWithBuffer("MyChannel", "CLIENT_SUBSCRIBER_ID");

RTSubscribeWithNotifications(channel, subscribeOnReconnect: boolean)

Subscribes a pub/sub channel with Push Notifications Service, to receive messages even if the app is not running.

Parameters

• channel - Channel name

• subscribeOnReconnected - Indicates whether the client should subscribe to the channel when reconnected (if it was previously subscribed when connected).

Example:

RCTRealtimeMessaging.RTSubscribeWithNotifications("MyChannel", true);

RTUnsubscribe(channel)

Unsubscribes a channel.

Parameters

• channel - Channel name.

Example:

RCTRealtimeMessaging.RTUnsubscribe("MyChannel");

RTSendMessage(message, channel)

Sends a message to a pub/sub channel.

Parameters

• channel - Channel name

• message - The message to send (a string/stringified JSON object)

Example:

RCTRealtimeMessaging.RTSendMessage("Hello World","MyChannel");

RTPublishMessage(channel, message, ttl, onPublishResultCallback)

Publish a message to a channel.

Parameters

• channel - The channel name.
• message - The message to publish.
• ttl - The message expiration time in seconds (0 for maximum allowed ttl).
• onPublishResultCallback - callback returns error if message publish was not successful or published message unique id (seqId) if sucessfully published

Example:

RCTRealtimeMessaging.RTPublishMessage("MyChannel", "Hello World", ttl, function(error, seqId){

});

RTEnablePresence(aPrivateKey, channel, aMetadata:boolean)

Enables presence for the specified channel with first 100 unique connection metadata.

Parameters

• privateKey - The Realtime application private key

• channel - Channel to enable presence

• metadata - Sets to return metadata info

Example:

RCTRealtimeMessaging.RTEventListener("onEnablePresence", function(event){
	if(event.result){
		console.log('Realtime enablePresence result: ' + event.result);
	}else{
		console.log('Realtime enablePresence error: ' + event.error);
	}
}),

RCTRealtimeMessaging.RTEnablePresence(aPrivateKey, channel, aMetadata);

RTDisablePresence(aPrivateKey, channel)

Disables presence for the specified channel.

Parameters

• privateKey - The Realtime application private key

• channel - Channel to disable presence

Example:

RCTRealtimeMessaging.RTEventListener("onDisablePresence", function(event){
	if(event.result){
		console.log('Realtime disablePresence result: ' + event.result);
	}else{
		console.log('Realtime disablePresence error: ' + event.error);
	}
}),

RCTRealtimeMessaging.RTDisablePresence(aPrivateKey, channel);

RTPresence(channel)

Gets a dictionary with the total number of subscriptions in the specified channel and if active the first 100 unique connection metadata of the subscribers.

Parameters

• channel - Channel with presence data active

Example:

RCTRealtimeMessaging.RTEventListener("onPresence", function(event){
	if(event.result){
		console.log('Realtime presence result: ' + JSON.stringify(event.result));
	}else{
		console.log('Realtime presence error: ' + event.error);
	}
}),

RCTRealtimeMessaging.RTPresence(channel);

RTIsSubscribed(channel, callBack: function)

Indicates whether a given channel is currently subscribed.

Parameters

• channel - Channel name.

• callback - Callback function to be called with the result (true or false).

Example:

RCTRealtimeMessaging.RTIsSubscribed("MyChannel", function(result){
	if(result == true){
		console.log('channel is subscribed');
	}else{
		console.log('channel is not subscribed');
	}
});

RTGetHeartbeatTime(callBack: function)

Get the client heartbeat interval.

Parameters

• callback - Callback function with the heartbeat interval value

Example:

RCTRealtimeMessaging.RTGetHeartbeatTime(function(result){
	console.log('HeartbeatTime for this client is: ' + result);
});

RTSetHeartbeatTime(newHeartbeatTime)

Sets the client heartbeat interval.

Parameters

• newHeartbeatTime - The new heartbeat interval

Example:

RCTRealtimeMessaging.RTSetHeartbeatTime(10);

RTGetHeartbeatFails(callBack: function)

Number of times the heartbeat can fail before the connection is reconnected

Parameters

• callBack - The callback function to get the HeartbeatFails value

Example:

RCTRealtimeMessaging.RTGetHeartbeatFails(function(result){
	console.log('HeartbeatFails Time for this client is: ' + result);
});

RTSetHeartbeatFails(newHeartbeatFails)

Sets the number of times the heartbeat can fail before the connection is reconnected

Parameters

• newHeartbeatFails - The new heartbeat fails value

Example:

RCTRealtimeMessaging.RTSetHeartbeatFails(3);

RTIsHeartbeatActive(callBack: function)

Indicates whether the client heartbeat is active or not.

Parameters

• callBack - The callback function with the result

Example:

RCTRealtimeMessaging.RTIsHeartbeatActive(function(result){
	if(result == true){
		console.log('heartbeat active');
	}else{
		console.log('heartbeat inactive');
	}		
});

RTEnableHeartbeat()

Enables the client heartbeat.

Example:

RCTRealtimeMessaging.RTEnableHeartbeat()

RTDisableHeartbeat()

Disables the client heartbeat.

Example:

RCTRealtimeMessaging.RTDisableHeartbeat()

Full example ( index.android.js )

'use strict';

import React, { Component } from 'react';
import realtime from './RCTRealtimeMessagingAndroid';
var RCTRealtimeMessaging = new realtime();

var messages = [];

import {
  AppRegistry,
  Image,
  StyleSheet,
  Text,
  Navigator,
  TextInput,
  ScrollView,
  TouchableHighlight,
  ListView,
  View
} from 'react-native';


var RealtimeRCT = React.createClass({

  doConnect: function(){
    this._log('Trying to connect!');

    RCTRealtimeMessaging.RTEventListener("onConnected",this._onConnected),
    RCTRealtimeMessaging.RTEventListener("onDisconnected",this._onDisconnected),
    RCTRealtimeMessaging.RTEventListener("onSubscribed",this._onSubscribed),
    RCTRealtimeMessaging.RTEventListener("onUnSubscribed",this._onUnSubscribed),
    RCTRealtimeMessaging.RTEventListener("onException",this._onException),
    RCTRealtimeMessaging.RTEventListener("onMessage",this._onMessage),
    RCTRealtimeMessaging.RTEventListener("onPresence",this._onPresence);

    RCTRealtimeMessaging.RTConnect(
    {
      appKey:this.state.appKey,
      token:this.state.token,
      connectionMetadata:this.state.connectionMetadata,
      clusterUrl:this.state.clusterUrl,
      projectId:'<YOUR_GOOGLE_PROJECT_NUMBER>'
    });
  },

  componentDidMount: function(){
	  RCTRealtimeMessaging.RTPushNotificationListener(this._onNotification);
  },

  _onNotification: function(data) {
	 this._log("Received push notification: " + JSON.stringify(data));  
  },

  componentWillUnmount: function() {
    RCTRealtimeMessaging.RTDisconnect();
  },

  doDisconnect:function(){
      RCTRealtimeMessaging.RTDisconnect();
  },

  doSubscribe: function(){
    RCTRealtimeMessaging.RTSubscribe(this.state.channel, true);
    // To subscribe using push notifications use the RTSubscribeWithNotifications method
  },

  doUnSubscribe: function(){
    RCTRealtimeMessaging.RTUnsubscribe(this.state.channel);
  },

  doSendMessage: function(){
    RCTRealtimeMessaging.RTSendMessage(this.state.message, this.state.channel);
  },

  doPresence: function(){
    RCTRealtimeMessaging.RTPresence(
       this.state.channel
     );
  },


  _onException: function(exceptionEvent){
    this._log("Exception:" + exceptionEvent.error);
  },

  _onConnected: function()
  {
    this._log("connected");
  },


  _onDisconnected: function(){
    this._log("disconnected");
  },

  _onSubscribed: function(subscribedEvent)
  {
    this._log("subscribed channel " + subscribedEvent.channel);
  },

  _onUnSubscribed: function(unSubscribedEvent)
  {
    this._log("unsubscribed channel " + unSubscribedEvent.channel);
  },

  _onMessage: function(messageEvent)
  {
    this._log("received message: ["+messageEvent.message+"] on channel [" + messageEvent.channel+"]");  
  },

  _onPresence: function(presenceEvent){
    if (presenceEvent.error) {
      this._log("Error getting presence: " + presenceEvent.error);
    }else
    {
      this._log("Presence data: " + JSON.stringify(presenceEvent.result));
    };    
  },


  getInitialState: function() {
    return {
      clusterUrl: "http://ortc-developers.realtime.co/server/2.1/",
      token: "SomeAuthenticatedToken",
      appKey: "YOUR_APP_KEY",
      channel: "yellow",
      connectionMetadata: "clientConnMeta",
      message: "some message",
      dataSource: new ListView.DataSource({
        rowHasChanged: (row1, row2) => row1 !== row2,
      }),
    };
  },

  _renderRow: function(rowData: string, sectionID: number, rowID: number) {
    return (
      <TouchableHighlight>
        <View>
          <View style={styles.row}>
            <Text style={styles.text}>
              {rowData}
            </Text>
          </View>
          <View style={styles.separator} />
        </View>
      </TouchableHighlight>
    );
  },

  _log: function(message: string)
  {
    var time = this.getFormattedDate();
    time += " - " + message
    var temp = [];
    temp[0] = time;

    for (var i = 0; i < messages.length; i++) {
      temp[i+1] =  messages[i];
    };
    messages = temp;

    this.setState({
      dataSource: this.getDataSource(messages)
    });
  },

  getFormattedDate: function() {
    var date = new Date();
    var str = date.getHours() + ":" + date.getMinutes() + ":" + date.getSeconds();
    return str;
  },

  getDataSource: function(messages: Array<any>): ListView.DataSource {
    return this.state.dataSource.cloneWithRows(messages);
  },

  render: function() {
    return (
      <ScrollView style={styles.container}>

        <Text clusterUrl = {this.state.clusterUrl} >
            clusterUrl:
        </Text>
        <TextInput
          style={styles.textInput}
          placeholder={this.state.clusterUrl}
          onChangeText={(text) => this.setState({server: text})}
        />

        <View style={styles.custom}>
          <View style={styles.margin}>
            <Text server = {this.state.server} >
                Authentication Token:
            </Text>
            <TextInput
              style={styles.halfTextInput}
              placeholder={this.state.token}
              onChangeText={(text) => this.setState({token: text})}
            />

            <Text server = {this.state.server} >
                Application Key:
            </Text>
            <TextInput
              style={styles.halfTextInput}
              placeholder={this.state.appKey}
              onChangeText={(text) => this.setState({appKey: text})}
            />
          </View>

          <View style={styles.margin}>
            <Text server = {this.state.server} >
                Channel:
            </Text>
            <TextInput
              style={styles.halfTextInput}
              placeholder={this.state.channel}
              onChangeText={(text) => this.setState({channel: text})}
            />

            <Text server = {this.state.server} >
                Connection Metadata:
            </Text>
            <TextInput
              style={styles.halfTextInput}
              placeholder={this.state.connectionMetadata}
              onChangeText={(text) => this.setState({connectionMetadata: text})}
            />
          </View>

        </View>
        <Text server = {this.state.server} >
            Message:
        </Text>
        <TextInput
          style={styles.textInput}
          placeholder={this.state.message}
          onChangeText={(text) => this.setState({message: text})}
        />


        <View style={styles.rowView}>

          <TouchableHighlight style={styles.button} onPress={this.doConnect}>
            <View style={styles.tryAgain}>
              <Text style={styles.tryAgainText}>Connect</Text>
            </View>
          </TouchableHighlight>

          <TouchableHighlight style={styles.button} onPress={this.doDisconnect}>
            <View style={styles.tryAgain}>
              <Text style={styles.tryAgainText}>Disconnect</Text>
            </View>
          </TouchableHighlight>

          <TouchableHighlight style={styles.button} onPress={this.doSubscribe}>
            <View style={styles.tryAgain}>
              <Text style={styles.tryAgainText}>Subscribe</Text>
            </View>
          </TouchableHighlight>

          <TouchableHighlight style={styles.button} onPress={this.doUnSubscribe}>
            <View style={styles.tryAgain}>
              <Text style={styles.tryAgainText}>Unsubscribe</Text>
            </View>
          </TouchableHighlight>

          <TouchableHighlight style={styles.button} onPress={this.doSendMessage}>
            <View style={styles.tryAgain}>
              <Text style={styles.tryAgainText}>Send</Text>
            </View>
          </TouchableHighlight>

          <TouchableHighlight style={styles.button} onPress={this.doPresence}>
            <View style={styles.tryAgain}>
              <Text style={styles.tryAgainText}>Presence</Text>
            </View>
          </TouchableHighlight>

        </View>
        <ListView
          style={styles.list}
          dataSource={this.state.dataSource}
          renderRow={this._renderRow}
        />
      </ScrollView>

    )}
  });

var styles = StyleSheet.create({
  container: {
    marginTop: 30,
    margin: 5,
    backgroundColor: '#FFFFFF',
  },
  list: {
    flexDirection: 'column',
    backgroundColor: '#F6F6F6',
    height:150,
  },
  rowView:{
    alignItems: 'stretch',
    flexDirection: 'row',
    flexWrap: 'wrap',
    justifyContent:'center',
  },
  button:{
    margin: 5,
  },
  margin:{

  },
  custom:{
    flexDirection: 'row',
    flexWrap: 'wrap',
    justifyContent:'space-between',
  },
  textInput:{
    height: 30,
    borderColor: 'gray',
    borderWidth: 1,
    borderRadius: 4,
    padding: 5,
    fontSize: 15,
  },

  halfTextInput:{
    height: 30,
    borderColor: 'gray',
    borderWidth: 1,
    borderRadius: 4,
    padding: 5,
    fontSize: 15,
    width: 153,
  },
  tryAgain: {
    backgroundColor: '#336699',
    padding: 13,
    borderRadius: 5,
  },
  tryAgainText: {
    color: '#ffffff',
    fontSize: 14,
    fontWeight: '500',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
  },
  row: {
    flexDirection: 'row',
    justifyContent: 'center',
    padding: 10,
    backgroundColor: '#F6F6F6',
  },
  separator: {
    height: 1,
    backgroundColor: '#CCCCCC',
  },
  thumb: {
    width: 64,
    height: 64,
  },
  text: {
    flex: 1,
    fontSize: 13,
  },
});

AppRegistry.registerComponent('RealtimeRCT', () => RealtimeRCT);

Example

Checkout the example at https://github.com/realtime-framework/RealtimeMessaging-ReactNativeAndroidExample

Authors

Realtime.co