java - inputStream null 延迟 Kotlin

Question

你好，我正在 android studio 中编写一个客户端应用程序

这是我的客户类:

class Client : Socket()
{

    init {
        recvMessage()
    }

    companion object
    {
        var receivedMessage :ByteArray = ByteArray(1024)
    }


    fun sendMessage(data: ByteArray )
    {
        if(isConnected)
            Thread {
                val dataOutputStream = DataOutputStream(this.outputStream)
                dataOutputStream.write(data)
            }.start()
    }



    private fun recvMessage() = Thread{
        while(true)
        {
            if (isConnected) {
                inputStream.read(receivedMessage)
            }
        }
    }.start()

    fun getMessage():ByteArray
    {
        return receivedMessage;
    }

}

要使用此客户端，我有 MyApplication 类，如图所示 here

在应用程序启动时，客户端得到配置(连接到服务器)

然后我进入登录 Activity ，向服务器发送登录请求并得到答案这是登录按钮功能

fun login(view: View)
{
        val username = findViewById<EditText>(R.id.username).text.toString()
        val password = findViewById<EditText>(R.id.password).text.toString()

        (this.application as MyApplication).client.sendMessage(PacketFactory.loginRequest(username, password))
        val serverResponse = (this.application as MyApplication).client.getMessage()
        val buf : ByteBuffer = ByteBuffer.wrap(serverResponse)

        println()
        println("got:" + Message.getRootAsMessage(buf).data)
        println()


}

问题是，在第一次单击时，我得到 null，然后是我之前需要的消息(之前单击)

对于那些更有经验的人的任何帮助将不胜感激。我的技能已经结束了...需要一些指导，请!

Answer 1

已修复:我添加了消息堆栈

package com.trivia_app
import java.io.DataOutputStream
import java.net.Socket
import java.util.*

class Client : Socket()
{

    init {
        recvMessage()
    }

    companion object
    {
        var pendingMessages : Stack<ByteArray> = Stack()
    }


    fun sendMessage(data: ByteArray )
    {
        if(isConnected)
            Thread {
                val dataOutputStream = DataOutputStream(this.outputStream)
                dataOutputStream.write(data)
            }.start()
    }



    private fun recvMessage() = Thread{
        val message = ByteArray(1024)
        while(true)
            if (isConnected)
                if (inputStream.read(message) > 0)
                    pendingMessages.push(message)
    }.start()

    fun getMessage():ByteArray
    {
        while (pendingMessages.empty());
        return pendingMessages.pop()
    }

}