Android-er: 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<NetworkInterface> enumNetworkInterfaces = NetworkInterface
     .getNetworkInterfaces();
   while (enumNetworkInterfaces.hasMoreElements()) {
    NetworkInterface networkInterface = enumNetworkInterfaces
      .nextElement();
    Enumeration<InetAddress> 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 = 
     "<html><head></head>" +
     "<body>" +
     "<h1>" + h1 + "</h1>" +
     "</body></html>";
    
    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;
  }
 }

}

<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"
    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" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />
    
    <EditText
        android:id="@+id/welcomemsg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Welcome from Android-er" />

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

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

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

</LinearLayout>

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".

11 comments:

UnknownFebruary 2, 2015 at 3:16 AM
your blog is best.....
how to share external storage directory and make them downloadable from pc... like wifi file sharing applications
UnknownMay 9, 2015 at 5:11 AM
Great Tutorial
Please sir/mam
how to share external storage directory and make them downloadable from pc... like wifi file sharing applications
Prasad KothavaleOctober 18, 2015 at 12:57 AM
I guess it will also require internet permission

in AndroidManifest.xml
AnonymousOctober 20, 2015 at 6:02 AM
How to send image through socket and user can download from it?
AnonymousNovember 22, 2015 at 10:50 PM
this application is not working as shown in the video. I added a few permissions to manifest file but still i don't get logs on the screen. Can anyone help?
Mridul GuptaMarch 30, 2016 at 3:42 AM
Dont socket.close() before reading InetAddress.
ErikMarch 30, 2016 at 7:19 AM
hello Mridul Gupta,

Yes, I already 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".
Féroce LapinApril 18, 2018 at 1:22 PM
Just 2 small details:
1) don't forget to add ":8888" after the IP on the URL you write in your browser
2) if you use the server from a browser on local network, eveything's OK. But if you use it throught a Javascrit call, using XMLHttpRequest you'll receive... nothing! In fact the server send a http.readyState at 4 (everything OK) but a http.status at 0 rather than 200. To get a http.status at 200 you must add a line in the header sended by the server. You must have:
os.print("HTTP/1.1 200 OK" + "\r\n");
os.print("Access-Control-Allow-Origin: *" + "\r\n");
Hope this will help.
Féroce LapinApril 18, 2018 at 1:33 PM
@Andr.oid Eric. I think you have a config problem in your dev tool (Android Studio?). Because I use this small web server on a Samsung Galaxy TAB E running Android 4.4 and on a Samsung J2 running 6.01 and in both cases, it work like a charm. I tried it also on a really bad and old "low quality Chinese smartphone" and it works too.
UnknownJune 4, 2018 at 6:56 AM
Thank you very much..
It helped and exactly what i was looking for..
Can we use post instead of get to post additional data.
Thanks again.
AnonymousJuly 15, 2018 at 12:04 AM
used as sample. worked at first run,but not inside the emulator. only on real hardware.

Saturday, August 16, 2014

Implement simple HTTP server running on Android

11 comments: