<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 tools:context=".MainActivity">

 <EditText
 android:id="@+id/editText"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:hint="请输入要发送的内容"/>
 
 <Button
 android:id="@+id/button01"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="连接"/>

 <Button
 android:id="@+id/button02"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="发送"/>

 <ScrollView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:scrollbars="vertical"
 android:fadingEdge="vertical">
 <TextView
  android:id="@+id/textView"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="输出信息:"/>
 </ScrollView>

</LinearLayout>

package com.ryan.socketdemo01;

import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.Socket;

/**
 * 本实例功能： 客户端发送数据至客户端（动态输出数据）
 *
 */
public class MainActivity extends AppCompatActivity implements View.OnClickListener{

 private Button button01 = null;
 private Button button02 = null;
 private EditText editText = null;
 private TextView textView = null;

 private static Socket ClientSocket = null;
 private byte[] msgBuffer = null;
 Handler handler = new Handler();


 private void initView() {
 button01 = (Button) findViewById(R.id.button01);
 button02 = (Button) findViewById(R.id.button02);
 editText = (EditText) findViewById(R.id.editText);
 textView = (TextView) findViewById(R.id.textView);

 button01.setOnClickListener(this);
 button02.setOnClickListener(this);

 button01.setEnabled(true);
 button02.setEnabled(false);
 }


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

 }


 @Override
 public void onClick(View v) {
 switch (v.getId()){
  case R.id.button01:
  // TODO: 15-9-4 socket连接线程
  connectThread();
  break;
  case R.id.button02:
  // TODO: 15-9-4 发送数据线程
  sendMsgThread();
  break;
 }
 }

 private void sendMsgThread() {

 final String text = editText.getText().toString();
 try {
  msgBuffer = text.getBytes("UTF-8");
 } catch (UnsupportedEncodingException e) {
  e.printStackTrace();
 }

 new Thread(new Runnable() {
  @Override
  public void run() {
  try {
   OutputStream outputStream;
   //Socket输出流
   outputStream = ClientSocket.getOutputStream();

   outputStream.write(msgBuffer);
   outputStream.flush();
   outputStream.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
  handler.post(new Runnable() {
   @Override
   public void run() {
   textView.append("发送成功："+text+"\n");
   }
  });
  }
 }).start();
 }

 private void connectThread() {
 new Thread(new Runnable() {
  @Override
  public void run() {
  try {
   ClientSocket = new Socket("10.0.2.2",9001);
   if (ClientSocket.isConnected()){
   handler.post(new Runnable() {
    @Override
    public void run() {
    textView.append("连接成功！"+"\n");
    button01.setEnabled(false);
    button02.setEnabled(true);
    }
   });
   }else {
   handler.post(new Runnable() {
    @Override
    public void run() {
    textView.append("连接失败！"+"\n");
    }
   });
   }
  } catch (IOException e) {
   e.printStackTrace();
  }
  }
 }).start();
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 // Inflate the menu; this adds items to the action bar if it is present.
 getMenuInflater().inflate(R.menu.menu_main, menu);
 return true;
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
 // Handle action bar item clicks here. The action bar will
 // automatically handle clicks on the Home/Up button, so long
 // as you specify a parent activity in AndroidManifest.xml.
 int id = item.getItemId();

 //noinspection SimplifiableIfStatement
 if (id == R.id.action_settings) {
  return true;
 }

 return super.onOptionsItemSelected(item);
 }
}

new Thread (new Runnable) {
 @Override
 public void run() {
 } 
} 

Handler handler = new Handler(); 

handler.post(new Runnable() {
   @Override
   public void run() {
   textView.append("发送成功："+text+"\n");
   }
  });
 

ClientSocket = new Socket("10.0.2.2",9001);

outputStream = ClientSocket.getOutputStream();

/**
 * 本实例功能：接受服务器发来的数据
 */
public class Main {

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    new SerVerListener().start();
  }

}

 import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.ServerSocket;
import java.net.Socket;

import javax.swing.JOptionPane;


public class SerVerListener extends Thread{
  
  private Socket clientSocket = null;
  private ServerSocket serverSocket = null;
  private InputStream inputStream = null;
  private byte[] buffer = null;
  
  @Override
  public void run() {
    // TODO Auto-generated method stub
    
    try {
      serverSocket = new ServerSocket(9001);
      System.out.println("端口已开启，等待连接中〜〜");
      //block
      clientSocket = serverSocket.accept();
      System.out.println("已有用户连接");
      inputStream = clientSocket.getInputStream();
      
      BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
      String str;
      
      while((str = br.readLine())!= null){
        System.out.println(str);
      }
      
    }catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }finally{
      try {
        inputStream.close();
        serverSocket.close();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
    
    
  }

}