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How to implement real-time data updates using WebSocket in Kotlin Android

How to implement real-time data updates using WebSocket in Kotlin Android.

Here's a detailed step-by-step tutorial on how to implement real-time data updates using WebSocket in Kotlin Android.

Step 1: Add WebSocket dependency

To get started, you need to add the WebSocket dependency to your project. Open your app-level build.gradle file and add the following line in the dependencies block:

implementation ""

Step 2: Create WebSocket client

Next, you need to create a WebSocket client to establish a connection with the server. Create a new Kotlin class called WebSocketClient.kt and add the following code:

import org.java_websocket.client.WebSocketClient
import org.java_websocket.handshake.ServerHandshake

class MyWebSocketClient(serverUri: URI) : WebSocketClient(serverUri) {
override fun onOpen(handshakedata: ServerHandshake) {
// Connection established
// You can send any initial messages here

override fun onClose(code: Int, reason: String, remote: Boolean) {
// Connection closed

override fun onMessage(message: String) {
// Handle incoming messages from the server

override fun onError(ex: Exception) {
// Handle any errors

Step 3: Establish WebSocket connection

In your activity or fragment where you want to establish the WebSocket connection, create an instance of the MyWebSocketClient class and connect to the server. Add the following code:


val serverUri = URI("wss://")
val webSocketClient = MyWebSocketClient(serverUri)

Make sure to replace "wss://" with the actual WebSocket server URL.

Step 4: Send and receive messages

To send and receive messages over the WebSocket connection, you can use the methods provided by the WebSocketClient class. Here are some examples:

Sending a message:

webSocketClient.send("Hello server!")

Receiving a message:

webSocketClient.onMessage = { message ->
// Handle incoming message from the server

Step 5: Close the WebSocket connection

When you're done with the WebSocket connection, make sure to close it to free up resources. You can do this by calling the close() method on the WebSocketClient instance:


That's it! You have successfully implemented real-time data updates using WebSocket in Kotlin Android. You can now send and receive real-time messages from the server.

Remember to handle errors, implement any necessary authentication or authorization, and handle disconnections gracefully in your application.

I hope you find this tutorial helpful.