kotlin实现移动端websocket客户端代码

以下是Kotlin实现的WebSocket客户端代码：

import okhttp3.*
import okio.ByteString

class WebSocketClient(private val url: String) {
    private var client: OkHttpClient? = null
    private var webSocket: WebSocket? = null

    fun connect() {
        val request = Request.Builder().url(url).build()
        client = OkHttpClient()
        webSocket = client!!.newWebSocket(request, object : WebSocketListener() {
            override fun onOpen(webSocket: WebSocket, response: Response) {
                println("Connected to server: ${response.message}")
            }

            override fun onMessage(webSocket: WebSocket, text: String) {
                println("Received message: $text")
            }

            override fun onMessage(webSocket: WebSocket, bytes: ByteString) {
                println("Received bytes: ${bytes.hex()}")
            }

            override fun onClosing(webSocket: WebSocket, code: Int, reason: String) {
                println("Closing connection: $code $reason")
            }

            override fun onFailure(webSocket: WebSocket, t: Throwable, response: Response?) {
                println("Connection failed: ${t.message}")
            }
        })
    }

    fun send(message: String) {
        webSocket?.send(message)
    }

    fun close() {
        webSocket?.close(1000, null)
    }
}

使用该客户端，您可以通过以下方式连接到WebSocket服务器：

val client = WebSocketClient("ws://example.com")
client.connect()

一旦连接建立，您可以使用 `send()` 方法向服务器发送消息：

client.send("Hello, server!")

最后，您可以使用 `close()` 方法关闭WebSocket连接：

client.close()

注意：此示例使用OkHttp库来处理WebSocket连接。在使用此代码之前，请确保已将其添加到您的项目依赖项中。