android compose socket TCP通信

连接的创建可以放在viewmodel中。

1.创建连接

    var isConnected:MutableState<Boolean> = mutableStateOf(false)
    val client = mutableStateOf<Socket?>(null)
    var ip="192.168.100.102"
    var port = "61001"

    init {
        reConnectNet()

    }

    fun reConnectNet()
    {
        if (isConnected.value) {
            disconnect(client, isConnected)
        } else {
            connect(ip, port, client, isConnected)
        }
    }

    fun connect(
        ip: String,
        port: String,
        client: MutableState<Socket?>,
        isConnected: MutableState<Boolean>
    ) {
        if (ip.isEmpty() || port.isEmpty()) {
            // IP地址或端口号为空，进行错误处理
            return
        }

        GlobalScope.launch(Dispatchers.IO) {
            try {
                val socket = Socket(ip, port.toInt())
                client.value = socket
                isConnected.value = true
                socket.outputStream.write("Hello from the client!".toByteArray())
            } catch (e: IOException) {
                e.printStackTrace()
                // 处理连接异常
                Log.d("scoreInfo",e.toString())
            }
        }
    }

2.断开连接

    fun disconnect(client: MutableState<Socket?>, isConnected: MutableState<Boolean>) {
        client.value?.let { socket ->
            if (!socket.isClosed) {
                socket.close()
            }
            isConnected.value = false
            client.value = null
        }
    }

3.数据发送

    fun sendData(input:ByteArray)
    {
        if (!isConnected.value) {
            // 如果未连接，进行错误处理或其他操作
            return
        }

        GlobalScope.launch(Dispatchers.IO) {
            try {
                client?.let { socket ->
                    val outputStream = socket.value?.getOutputStream()
                    outputStream?.write(
                        input
                    )
                    outputStream?.flush()
                    // 不关闭outputStream，保持连接
                }
            } catch (e: IOException) {
                e.printStackTrace()
                // 处理发送数据异常
            }
        }
    }
    fun sendData(input:String)
    {
        val byteArray = input.toByteArray()
        sendData(byteArray)
    }