Java – How to use wifi to send data to the same app installed on other android devices

I have an app like “A” on my android device, the

same app like “B” installed on another android device, and now I want to send data from app “A” to app “B” using the WIFI service. So please advise me on how to implement this feature.

I tried several times to get help from Google, but in vain.
DIRECTLY VIA WIFI OR NFC.

You can use a simple P2P architecture.

You will need to use this, this and a pair of streams that deal with the type of data you need to send, eg this .

Sender:

Socket s = new Socket(IP,PORT);
s.connect();
DataOutputStream dos = new DataOutputStream(s.getOutputStream());
dos.write("hello".toByteArray());

Then on the receiving side:

ServerSocket ss = new ServerSocket(PORT);
Socket s = ss.accept(); This call will block execution, use separate thread
DataInputStream dis = new DataInputStream(s.getInputStream);
byte[] data = dis.read();

With it, you can send and receive bytes simply using the stream that is appropriate for your data type.

Of course, once the connection is established, both clients can send/write by simply creating the appropriate input/output streams.

Hope this helps you.