android - Making chat app -

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i want chat application , found code on github : https://github.com/pirngruber/androidim. , author created function send message looks this

public string sendhttprequest(string params)     {                url url;         string result = new string();         try          {             url = new url(authentication_server_address);             httpurlconnection connection;             connection = (httpurlconnection) url.openconnection();             connection.setdooutput(true);              printwriter out = new printwriter(connection.getoutputstream());              out.println(params);             out.close();              bufferedreader in = new bufferedreader(                     new inputstreamreader(                             connection.getinputstream()));             string inputline;              while ((inputline = in.readline()) != null) {                 result = result.concat(inputline);                           }             in.close();                  }          catch (malformedurlexception e) {             e.printstacktrace();         }          catch (ioexception e) {             e.printstacktrace();         }                     if (result.length() == 0) {             result = http_request_failed;         }          return result;       }

where private static final string authentication_server_address = "http://192.168.0.102/android-im/index.php";

and here explained how make run https://code.google.com/archive/p/simple-android-instant-messaging-application/

so, question that: understood author sends messages server , after server sends them user. so, if pc turned off server won't work , chat won't work too, right? if yes, can explain me how chat app without server?

thank you

yes, seems requires server online @ times. that's how modern chat applications on smartphones work (telegram, whatsapp, threema, google chats...). without server rely on fact both smartphones online @ same time in order establish direct connection. huge disadvantage , works against power-saving features of mobile os. 2 parties can hardly communicate if online @ different times.

so need decide whether want peer-to-peer or server-based chat. remember in case of p2p, have figure out ip addresses of other chat clients. , you'll have use sort of server, again.


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