python - How to send and receive data between flask framework web server and android app -

i unable communicate receive , send reply between web server(which uses flask framework) , android app code shown below. if possible can please post sample server end code might solve problem.

package com.project.nsj;  import java.io.ioexception; import java.io.unsupportedencodingexception; import java.util.arraylist; import java.util.list;  import org.apache.http.httpresponse; import org.apache.http.namevaluepair; import org.apache.http.client.clientprotocolexception; import org.apache.http.client.httpclient; import org.apache.http.client.entity.urlencodedformentity; import org.apache.http.client.methods.httppost; import org.apache.http.impl.client.defaulthttpclient; import org.apache.http.message.basicnamevaluepair;  import android.app.activity; import android.content.intent; import android.os.asynctask; import android.os.bundle; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.edittext; import android.widget.toast;  public class mainactivity extends activity {      string username, passkey;     edittext username, password;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          username = (edittext) findviewbyid(r.id.username);         password = (edittext) findviewbyid(r.id.password);         button login = (button) findviewbyid(r.id.login_button);          login.setonclicklistener(new onclicklistener() {              @override             public void onclick(view arg0) {                 // todo auto-generated method stub                 //checklogin login = new checklogin();                 //login.execute();                 intent funcs = new intent(mainactivity.this, functions.class);                 startactivity(funcs);             }         });      }      public class checklogin extends asynctask<void, void, integer> {          @override         protected integer doinbackground(void... params) {              username = username.gettext().tostring();             passkey = password.gettext().tostring();              httpclient httpclient = new defaulthttpclient();             httppost httppost = new httppost("http://rpihomeautomation.no-ip.biz");              list<namevaluepair> namevaluepair = new arraylist<namevaluepair>(2);             namevaluepair.add(new basicnamevaluepair("username", username));             namevaluepair.add(new basicnamevaluepair("passkey", passkey));              try {                 httppost.setentity(new urlencodedformentity(namevaluepair));             } catch (unsupportedencodingexception e) {                  e.printstacktrace();             }              httpresponse response;             int status = 0;             try {                 response = httpclient.execute(httppost);                 status = response.getstatusline().getstatuscode();             } catch (clientprotocolexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             } catch (ioexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }              return status;         }          @override         protected void onpostexecute(integer result) {             // todo auto-generated method stub             super.onpostexecute(result);             if (result == 200) {                 intent funcs = new intent(mainactivity.this, functions.class);                 startactivity(funcs);             } else {                 toast.maketext(mainactivity.this, "invalid password/username",                         toast.length_long).show();             }          }     }  } 

the simplest case handling http post request is:

from flask import flask, request  app = flask(__name__)  @app.route("/data", method=("post",)) def handle_data():     return "hello world - sent me " + str(request.values)  if __name__ == '__main__':     app.run()