我无法在WiFi连接中读取数据

Question

我想通过套接字WiFi连接将Nodemcu ESP8266的数据（POT电压）发送到android设备。我确定我的代码可以在Nodemcu上工作。因为我用puTTY检查过它。我想发送一个值并在我的android应用中显示它。我的应用可以通过特定的IP和端口连接到Nodemcu，但在“文本视图”中不显示值。     请帮助我。

主要活动：

package com.examplewifisocket.omid.wifisocket;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {

    TextView response;
    EditText editTextAddress, editTextPort;
    Button buttonConnect, buttonClear;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        editTextAddress =  findViewById(R.id.addressEditText);
        editTextPort =  findViewById(R.id.portEditText);
        buttonConnect =  findViewById(R.id.connectButton);
        buttonClear =  findViewById(R.id.clearButton);
        response =  findViewById(R.id.responseTextView);

        buttonConnect.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                Client myClient = new Client(editTextAddress.getText().toString(), Integer.parseInt(editTextPort.getText().toString()), response);
                myClient.execute();
            }
        });

        buttonClear.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                response.setText("");
            }
        });

    }


}

Client.java：

package com.examplewifisocket.omid.wifisocket;

import android.os.AsyncTask;
import android.widget.TextView;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client extends AsyncTask<Void, Void, String> {

    String dstAddress;
    int dstPort;
    String response = "";
    TextView textResponse;

    Client(String addr, int port, TextView textResponse) {
        dstAddress = addr;
        dstPort = port;
        this.textResponse = textResponse;
    }

    @Override
    protected String doInBackground(Void... arg0) {

        Socket socket = null;

        try {
            socket = new Socket(dstAddress, dstPort);

            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(1024);
            byte[] buffer = new byte[1024];

            int bytesRead;
            InputStream inputStream = socket.getInputStream();


            while ((bytesRead = inputStream.read(buffer)) != -1) {
                byteArrayOutputStream.write(buffer, 0, bytesRead);
                response += byteArrayOutputStream.toString("UTF-8");
            }

        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            response = "UnknownHostException: " + e.toString();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            response = "IOException: " + e.toString();
        } finally {
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

        return response;


    }

    @Override
    protected void onPostExecute(String result) {
        textResponse.setText(response);
        super.onPostExecute(result);
    }
}

布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="20dp"
        android:layout_marginBottom="20dp"
        android:autoLink="web"
        android:text=":)"
        android:textStyle="bold" />

    <EditText
        android:id="@+id/addressEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Server ip address" />

    <EditText
        android:id="@+id/portEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Server port number" />

    <Button
        android:id="@+id/connectButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="Connect..." />

    <Button
        android:id="@+id/clearButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Clear" />

    <TextView
        android:id="@+id/responseTextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="esp data"
        android:textSize="16sp"
        android:textColor="#000000"
        android:inputType="textMultiLine"/>

</LinearLayout>

arduino代码：

#include <ESP8266WiFi.h>
const char* ssid = "*****";
const char* password = "******";

const int analogInPin = A0;  

int sensorValue = 0;  
int outputValue = 0;  

WiFiServer wifiServer(80);

void setup() {

Serial.begin(115200);

  delay(1000);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting..");
  }

  Serial.print("Connected to WiFi. IP:");
  Serial.println(WiFi.localIP());

  wifiServer.begin();

   pinMode(D0, INPUT); 
  pinMode(D1, INPUT); 
}

void loop() {

 WiFiClient client = wifiServer.available();

  if (client) {

    while (client.connected()) {

        sensorValue = analogRead(analogInPin);
        char charBuf[10];
        itoa(sensorValue,charBuf,10);
        delay(1000);
        client.write(charBuf);
        client.print("_");
        Serial.print("value = ");
        Serial.println(charBuf);

      delay(10);
    }

    client.stop();
    Serial.println("Client disconnected");

  }
}