Connect two Android devices via router

Question

I want to send data from one Android device to another Android device which are connected to same router via wifi? Same App is installed on both devices and i want them to communicate each other connected to same router via wifi.

Possible duplicate of [Android - communicating between two devices](http://stackoverflow.com/questions/9608832/android-communicating-between-two-devices) — Florian Koch, Jul 21 '16 at 14:30
please clarify, I'm not sure what you mean. The answers of the other question also include information regarding connection via a router, not only direct, see [this answer](http://stackoverflow.com/a/26955220/3326982) — Florian Koch, Jul 21 '16 at 14:52

score 0 · Accepted Answer · edited Apr 19 '19 at 22:04

Use socket connection with any of these protocols UDP, TCP or HTTP

Send message using UDP

String messageStr="Hello Android!";
int server_port = 12345;
DatagramSocket s = new DatagramSocket();
InetAddress local = InetAddress.getByName("192.168.1.102");
int msg_length=messageStr.length();
byte[] message = messageStr.getBytes();
DatagramPacket p = new DatagramPacket(message,msg_length, local,server_port);
s.send(p);

Receive UDP message

String text;
int server_port = 12345;
byte[] message = new byte[1500];
DatagramPacket p = new DatagramPacket(message, message.length);
DatagramSocket s = new DatagramSocket(server_port);
s.receive(p);
text = new String(message, 0, p.getLength());
Log.d("Udp tutorial","message:" + text);
s.close();

score 0 · Answer 2 · edited May 23 '17 at 12:22

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I'm also interested in this (sending data between two devices on a wireless network connection without internet), so I did a quick search and found another answer below.

Android - communicating between two devices

https://stackoverflow.com/a/26955220/6589689

Android Wireless API will also work if your devices are on the same local network (i.e., use the same WiFi router)

edited May 23 '17 at 12:22

Community

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answered Jul 21 '16 at 14:20

dataricc

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please don't answer only with links. Looking at your Link, the question seems like a duplicate - this means this question should be marked as duplicate instead of beeing answered (I know you can't do that just yet) – Florian Koch Jul 21 '16 at 14:30

score 0 · Answer 3 · answered Jan 12 '20 at 01:44

0

Sockets are the way to accomplish this.

You'll need a way to discover the ip address and port of the socket you want to connect to. You can use Android network service discovery.

You can find a complete tutorial of how to build an app like this here

answered Jan 12 '20 at 01:44

InnisBrendan

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Connect two Android devices via router

3 Answers3