java - url.openConnection(); is not actually invoked -

im building graduation project collage "smart homes, home automation system" implemented arduion on mock-up structure.

to have full image, arduaio takes pin number via request switch on or of specific home device.

its cool when send http request browser, when use

openconnection(); 

method, it's never happens, when use data home rooms , devices it's working greatly.

i gave app permission access internet.

the code simple project made solve praticualy problem:

mainactivity.java

package com.bitsandbytes.xemma_pc.newprototype;  import android.os.asynctask; import android.support.v7.app.appcompatactivity; import android.os.bundle; import android.util.log; import android.view.view; import android.widget.button;  import java.io.ioexception; import java.net.httpurlconnection; import java.net.malformedurlexception; import java.net.url;  public class mainactivity extends appcompatactivity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         button button = (button) findviewbyid(r.id.button);         button.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 new sendrequest().execute();              }         });     }      private static class sendrequest extends asynctask <void,void,void>{          @override         protected void doinbackground(void... params) {             httpurlconnection httpurlconnection = null ;             url url ;             try {                 url = new url("http://192.168.1.143/pin=13");                 httpurlconnection = (httpurlconnection) url.openconnection();              } catch (malformedurlexception e) {                 e.printstacktrace();             } catch (ioexception e) {                 e.printstacktrace();             }finally {                 httpurlconnection.disconnect();             }              return null;         }     }  } 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <relativelayout 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: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="com.bitsandbytes.xemma_pc.newprototype.mainactivity">       <textview         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textappearance="?android:attr/textappearancelarge"         android:text="press test it"         android:id="@+id/textview"         android:layout_margintop="154dp"         android:layout_alignparenttop="true"         android:layout_centerhorizontal="true" />      <button         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="pin 13"         android:id="@+id/button"         android:layout_below="@+id/textview"         android:layout_centerhorizontal="true" /> </relativelayout> 

androidmanifist.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.bitsandbytes.xemma_pc.newprototype">     <uses-permission android:name="android.permission.internet"/>      <application         android:allowbackup="true"         android:icon="@mipmap/ic_launcher"         android:label="@string/app_name"         android:supportsrtl="true"         android:theme="@style/apptheme">         <activity android:name=".mainactivity">             <intent-filter>                 <action android:name="android.intent.action.main" />                  <category android:name="android.intent.category.launcher" />             </intent-filter>         </activity>     </application>  </manifest> 

i appreciate , tips in advance.

edit: guys helping me, helped me using getresponsemessage() method, , works :d didn't have use .connect method json strings before, working. anyway, help!

openconnection parses url , creates appropriate urlconnection subclass. network i/o doesn't happen until send or receive something.