android - Swiping through unlimited fragments - Confused over ViewPager process -

i trying create app pulls these ron swanson quotes api , displays them in fragment. when fragment swiped, app go fragment , display new quote. process supposed repeat indefinitely.

instead, app loads blank screen. have placed button , textview on fragment, each initial texts determine if has loads, nothing ever appears.

p.s.: may notice comical variable names , comments. didn't consider may need when writing (it's personal app learning).

p.p.s.: i'm not site still up, shouldn't affect @ point.

thanks can help. below 1) single java file of app 2) activity_main.xml file.

    @targetapi(build.version_codes.honeycomb)     public class mainactivity extends fragmentactivity {          @suppresswarnings("deprecation")         @override         protected void oncreate(bundle savedinstancestate) {             super.oncreate(savedinstancestate);             setcontentview(r.layout.activity_main);              //             viewpager pagingron = (viewpager) findviewbyid(r.id.pager);             pageradapter ronspageradapter = new custompageradapter(getsupportfragmentmanager());             pagingron.setadapter(ronspageradapter);             pagingron.setonpagechangelistener(new viewpager.onpagechangelistener() {                  @override                 public void onpagescrollstatechanged(int arg0) {                     // toxdo auto-generated method stub                  }                  @override                 public void onpagescrolled(int arg0, float arg1, int arg2) {                     // todo auto-generated method stub                  }                  @override                 public void onpageselected(int arg0) {                     // todo auto-generated method stub                  }             });              //initial asynctask setting first quote of great swan             ronswansetup ronswansonog = new ronswansetup();             ronswansonog.execute();         }          private class ronswansetup extends asynctask<void, string, void> {              @override             protected void doinbackground(void... socialism) {                 string ronquoteson = ""; //ron's wonderful first quote                 string rondotcom = "http://ron-swanson-quotes.herokuapp.com/quotes"; //the website fetching ron's wonderful quotes                 string[] ronsquotes = new string[1]; //ron speaks seldomly, pinnacle of wisdom                   try {                     url ronsurl = new url(rondotcom);                     httpurlconnection ronsconnection = (httpurlconnection) ronsurl.openconnection();                      bufferedreader thanksron = new bufferedreader(new inputstreamreader(ronsconnection.getinputstream()));                     string current;                      while((current = thanksron.readline()) != null)                     {                         ronquoteson += current;                     }                      ronsquotes[0] = ronquoteson;                  } catch (exception sorryron) {                     ronsquotes[0] = "the app appears unable simplest things correctly - maybe try restarting it?";                     sorryron.printstacktrace();                 }                  publishprogress(ronsquotes);                  return null;             }              protected void onprogressupdate(string... ronsquote) {                 textview ronstext = (textview) findviewbyid(r.id.text);                  string ronqouteson = ronsquote[0];                 ronstext.settext("not ron's quote");//for testing              }         }          public class custompageradapter extends fragmentpageradapter {              public custompageradapter(fragmentmanager fm) {                 super(fm);             }              @override             // method returns fragment associated             // specified position.             // called when adapter needs fragment             // , not exist.             public fragment getitem(int position) {                  // create fragment object                 ronfragson fragment = new ronfragson();                  // attach data we'll                 // use populate our fragment layouts                 bundle args = new bundle();                 args.putint("page_position", position + 1);                  // set arguments on fragment                 // fetched                 fragment.setarguments(args);                  return fragment;             }              @override             public int getcount() {                 return 3;             }          }          public class ronfragson extends fragment {              @override             public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {                 // inflate layout resource that'll returned                 view rootview = inflater.inflate(r.layout.swansons_fragment, container, false);                  // arguments supplied when                 // fragment instantiated in                 // custompageradapter                 bundle args = getarguments();                 ((textview) rootview.findviewbyid(r.id.text)).settext("page");                  return rootview;             }         }     } 

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    <horizontalscrollview         android:id="@+id/horizontal_swangrid"         android:layout_width="wrap_content"         android:layout_height="0dp"         android:layout_weight="40"          xmlns:android="http://schemas.android.com/apk/res/android">         <!--   don't think necessary, don't want rid of in case i'm wrong         <linearlayout             android:id="@+id/swanson_cant_container"             android:layout_width="wrap_content"             android:layout_height="match_parent"             android:orientation="horizontal" >             <textview                  android:id="@+id/ronswan1stquote"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"/>            <textview                  android:id="@+id/ronswan2ndquote"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"/>             <textview                  android:id="@+id/ronswan3rdquote"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"/>          </linearlayout>     -->         <android.support.v4.view.viewpager         xmlns:android="http://schemas.android.com/apk/res/android"         android:id="@+id/pager"         android:layout_width="match_parent"         android:layout_height="match_parent" />     </horizontalscrollview>