Adroid Studio基于TCP协议的通信

activity_main：

package com.example.mysocketclient;

import android.app.Activity;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;

public class MainActivity extends Activity {

    EditText ip;
    String ips;
    EditText editText;
    TextView text;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ip = (EditText) findViewById(R.id.ip);
        editText = (EditText) findViewById(R.id.edit);
        text = (TextView) findViewById(R.id.text);

        findViewById(R.id.connect).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                connect();
            }
        });
        findViewById(R.id.send).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                send();
            }
        });
    }

    Socket socket = null;
    BufferedWriter writer = null;
    BufferedReader reader = null;

    public void connect(){
        ips = ip.getText().toString();
            AsyncTask<Void,String,Void> read = new AsyncTask<Void, String, Void>() {
                @Override
                protected Void doInBackground(Void... params) {
                    try {
                        System.out.println("ip通过");
                        socket = new Socket(ips,8080);
                        System.out.println("ip通过");
                        writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
                        reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                    try {
                        while(true){
                            String line = reader.readLine();
                            if(line != null){
                                publishProgress(line);
                            }
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    return null;
                }
                @Override
                protected void onProgressUpdate(String... values) {
                    text.append("服务器说："+values[0]+"\n");
                    super.onProgressUpdate(values);
                }
            };
            read.execute();
    }
    public void send(){
        try {
            text.append("我说："+editText.getText().toString());
            writer.append(editText.getText().toString());
            editText.setText("");
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(writer!=null){
                try {
                    writer.flush();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        }
    }
}

XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:id="@+id/activity_main"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  android:orientation="vertical"  tools:context="com.example.mysocketclient.MainActivity">

    <LinearLayout  android:layout_width="match_parent"  android:layout_height="wrap_content">
        <EditText  android:layout_weight="1"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="10.108.232.108"  android:id="@+id/ip"/>
        <Button  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="连接"  android:id="@+id/connect"/>
    </LinearLayout>
    <TextView  android:layout_weight="1"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:text=""  android:id="@+id/text"/>
    <EditText  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:text=""  android:id="@+id/edit"/>
    <Button  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:text="发送"  android:id="@+id/send"/>
</LinearLayout>