Implement simple HTTP server running on Android

Example to implement simple HTTP server on Android:


MainActivity.java

package com.example.androidhttpserver;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.Enumeration;

import android.support.v7.app.ActionBarActivity;
import android.widget.EditText;
import android.widget.TextView;
import android.os.Bundle;

public class MainActivity extends ActionBarActivity {

 EditText welcomeMsg;
 TextView infoIp;
 TextView infoMsg;
 String msgLog = "";
 
 ServerSocket httpServerSocket;

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

  welcomeMsg = (EditText) findViewById(R.id.welcomemsg);
  infoIp = (TextView) findViewById(R.id.infoip);
  infoMsg = (TextView) findViewById(R.id.msg);

  infoIp.setText(getIpAddress() + ":" 
   + HttpServerThread.HttpServerPORT + "\n");

  HttpServerThread httpServerThread = new HttpServerThread();
  httpServerThread.start();
 }
 
 @Override
 protected void onDestroy() {
  super.onDestroy();

  if (httpServerSocket != null) {
   try {
    httpServerSocket.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
 }

 private String getIpAddress() {
  String ip = "";
  try {
   Enumeration enumNetworkInterfaces = NetworkInterface
     .getNetworkInterfaces();
   while (enumNetworkInterfaces.hasMoreElements()) {
    NetworkInterface networkInterface = enumNetworkInterfaces
      .nextElement();
    Enumeration enumInetAddress = networkInterface
      .getInetAddresses();
    while (enumInetAddress.hasMoreElements()) {
     InetAddress inetAddress = enumInetAddress.nextElement();

     if (inetAddress.isSiteLocalAddress()) {
      ip += "SiteLocalAddress: "
        + inetAddress.getHostAddress() + "\n";
     }

    }

   }

  } catch (SocketException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   ip += "Something Wrong! " + e.toString() + "\n";
  }

  return ip;
 }
 
 private class HttpServerThread extends Thread {
  
  static final int HttpServerPORT = 8888;

  @Override
  public void run() {
   Socket socket = null;
   
   try {
    httpServerSocket = new ServerSocket(HttpServerPORT);
    
    while(true){
     socket = httpServerSocket.accept();

     HttpResponseThread httpResponseThread = 
      new HttpResponseThread(
       socket, 
       welcomeMsg.getText().toString());
     httpResponseThread.start();
    }
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }

  }

  
 }
 
 private class HttpResponseThread extends Thread {
  
  Socket socket;
  String h1;
  
  HttpResponseThread(Socket socket, String msg){
   this.socket = socket;
   h1 = msg;
  }

  @Override
  public void run() {
   BufferedReader is;
   PrintWriter os;
   String request;
   
   
   try {
    is = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    request = is.readLine();
    
    os = new PrintWriter(socket.getOutputStream(), true);
    
    String response = 
     "" +
     "" +
     "
" + h1 + "
" +
     "";
    
    os.print("HTTP/1.0 200" + "\r\n");
    os.print("Content type: text/html" + "\r\n");
    os.print("Content length: " + response.length() + "\r\n");
    os.print("\r\n");
    os.print(response + "\r\n");
    os.flush();
    socket.close();
    
    
    msgLog += "Request of " + request 
      + " from " + socket.getInetAddress().toString() + "\n";
    MainActivity.this.runOnUiThread(new Runnable() {

     @Override
     public void run() {
      
      infoMsg.setText(msgLog);
     }
    });
    
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   
   return;
  }
 }

}

    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

            android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://picturedmagazine.blogspot.com/"
        android:textStyle="bold" />
    
            android:id="@+id/welcomemsg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Welcome from Pictured Magazine -- المجلة المصورة" />

            android:id="@+id/infoip"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

            android:layout_width="match_parent"
        android:layout_height="match_parent" >

                    android:id="@+id/msg"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    

Download the files.

Related:
- Simple web server using org.apache.http.protocol.HttpService

Updated@2015-11-25:
Permission of "android.permission.INTERNET" is needed in AndroidManifest.xml.

Updated@2015-11-26:
This code NOT work on Android 5, may be all 5+ version.
Fixed, refer post "socket.getInetAddress() return null on Android 5".