NavigationDrawerExample from developer.android, insted of planets, load webviews -

i downloaded navigation drawer example developer.android.com. , there example planets. want instead load images planets, load webviews url. don;t know how that. here code. sugestions ?

package com.example.android.navigationdrawerexample;  import java.util.locale;   import android.app.activity; import android.app.fragment; import android.app.fragmentmanager; import android.app.searchmanager; import android.content.intent; import android.content.res.configuration; import android.os.bundle; import android.support.v4.app.actionbardrawertoggle; import android.support.v4.view.gravitycompat; import android.support.v4.widget.drawerlayout; import android.view.layoutinflater; import android.view.menu; import android.view.menuinflater; import android.view.menuitem; import android.view.view; import android.view.viewgroup; import android.webkit.webview; import android.webkit.webviewclient; import android.widget.adapterview; import android.widget.arrayadapter; import android.widget.imageview; import android.widget.listview; import android.widget.toast;  public class mainactivity extends activity {     private drawerlayout mdrawerlayout;     private listview mdrawerlist;     private actionbardrawertoggle mdrawertoggle;      private charsequence mdrawertitle;     private charsequence mtitle;     private string[] mplanettitles;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          mtitle = mdrawertitle = gettitle();         mplanettitles = getresources().getstringarray(r.array.planets_array);         mdrawerlayout = (drawerlayout) findviewbyid(r.id.drawer_layout);         mdrawerlist = (listview) findviewbyid(r.id.left_drawer);          // set custom shadow overlays main content when drawer opens         mdrawerlayout.setdrawershadow(r.drawable.drawer_shadow, gravitycompat.start);         // set drawer's list view items , click listener         mdrawerlist.setadapter(new arrayadapter<string>(this,                 r.layout.drawer_list_item, mplanettitles));         mdrawerlist.setonitemclicklistener(new draweritemclicklistener());          // enable actionbar app icon behave action toggle nav drawer         getactionbar().setdisplayhomeasupenabled(true);         getactionbar().sethomebuttonenabled(true);          // actionbardrawertoggle ties the proper interactions         // between sliding drawer , action bar app icon         mdrawertoggle = new actionbardrawertoggle(                 this,                  /* host activity */                 mdrawerlayout,         /* drawerlayout object */                 r.drawable.ic_drawer,  /* nav drawer image replace 'up' caret */                 r.string.drawer_open,  /* "open drawer" description accessibility */                 r.string.drawer_close  /* "close drawer" description accessibility */                 ) {             public void ondrawerclosed(view view) {                 getactionbar().settitle(mtitle);                 invalidateoptionsmenu(); // creates call onprepareoptionsmenu()             }              public void ondraweropened(view drawerview) {                 getactionbar().settitle(mdrawertitle);                 invalidateoptionsmenu(); // creates call onprepareoptionsmenu()             }         };         mdrawerlayout.setdrawerlistener(mdrawertoggle);          if (savedinstancestate == null) {             selectitem(0);         }     }      @override     public boolean oncreateoptionsmenu(menu menu) {         menuinflater inflater = getmenuinflater();         inflater.inflate(r.menu.main, menu);         return super.oncreateoptionsmenu(menu);     }      /* called whenever call invalidateoptionsmenu() */     @override     public boolean onprepareoptionsmenu(menu menu) {         // if nav drawer open, hide action items related content view         boolean draweropen = mdrawerlayout.isdraweropen(mdrawerlist);         menu.finditem(r.id.action_websearch).setvisible(!draweropen);         return super.onprepareoptionsmenu(menu);     }      @override     public boolean onoptionsitemselected(menuitem item) {          // action bar home/up action should open or close drawer.          // actionbardrawertoggle take care of this.         if (mdrawertoggle.onoptionsitemselected(item)) {             return true;         }         // handle action buttons         switch(item.getitemid()) {         case r.id.action_websearch:             // create intent perform web search planet             intent intent = new intent(intent.action_web_search);             intent.putextra(searchmanager.query, getactionbar().gettitle());             // catch event there's no activity handle intent             if (intent.resolveactivity(getpackagemanager()) != null) {                 startactivity(intent);             } else {                 toast.maketext(this, r.string.app_not_available, toast.length_long).show();             }             return true;         default:             return super.onoptionsitemselected(item);         }     }      /* click listner listview in navigation drawer */     private class draweritemclicklistener implements listview.onitemclicklistener {         @override         public void onitemclick(adapterview<?> parent, view view, int position, long id) {             selectitem(position);         }     }      private void selectitem(int position) {         // update main content replacing fragments         fragment fragment = new planetfragment();         bundle args = new bundle();         args.putint(planetfragment.arg_planet_number, position);         fragment.setarguments(args);          fragmentmanager fragmentmanager = getfragmentmanager();         fragmentmanager.begintransaction().replace(r.id.content_frame, fragment).commit();          // update selected item , title, close drawer         mdrawerlist.setitemchecked(position, true);         settitle(mplanettitles[position]);         mdrawerlayout.closedrawer(mdrawerlist);     }      @override     public void settitle(charsequence title) {         mtitle = title;         getactionbar().settitle(mtitle);     }      /**      * when using actionbardrawertoggle, must call during      * onpostcreate() , onconfigurationchanged()...      */      @override     protected void onpostcreate(bundle savedinstancestate) {         super.onpostcreate(savedinstancestate);         // sync toggle state after onrestoreinstancestate has occurred.         mdrawertoggle.syncstate();     }      @override     public void onconfigurationchanged(configuration newconfig) {         super.onconfigurationchanged(newconfig);         // pass configuration change drawer toggls         mdrawertoggle.onconfigurationchanged(newconfig);     }      /**      * fragment appears in "content_frame", shows planet      */     public static class planetfragment extends fragment {         public static final string arg_planet_number = "planet_number";          public planetfragment() {             // empty constructor required fragment subclasses         }          @override         public view oncreateview(layoutinflater inflater, viewgroup container,                 bundle savedinstancestate) {             view rootview = inflater.inflate(r.layout.fragment_planet, container, false);             int = getarguments().getint(arg_planet_number);             string planet = getresources().getstringarray(r.array.planets_array)[i];              int imageid = getresources().getidentifier(planet.tolowercase(locale.getdefault()),                             "drawable", getactivity().getpackagename());            ((imageview) rootview.findviewbyid(r.id.image)).setimageresource(imageid);             getactivity().settitle(planet);             return rootview;           }             } } 

activity_main.xml

<android.support.v4.widget.drawerlayout     xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent">      <!-- main content view, view below consumes entire          space available using match_parent in both dimensions. -->     <framelayout         android:id="@+id/content_frame"         android:layout_width="match_parent"         android:layout_height="match_parent" />      <!-- android:layout_gravity="start" tells drawerlayout treat          sliding drawer on left side left-to-right          languages , on right side right-to-left languages.          drawer given fixed width in dp , extends full height of          container. solid background used contrast          content view. -->     <listview         android:id="@+id/left_drawer"         android:layout_width="240dp"         android:layout_height="match_parent"         android:layout_gravity="start"         android:choicemode="singlechoice"         android:divider="@android:color/transparent"         android:dividerheight="0dp"         android:background="#111"/> </android.support.v4.widget.drawerlayout> 

drawer_list.xml

<textview xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@android:id/text1"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:textappearance="?android:attr/textappearancelistitemsmall"     android:gravity="center_vertical"     android:paddingleft="16dp"     android:paddingright="16dp"     android:textcolor="#fff"     android:background="?android:attr/activatedbackgroundindicator"     android:minheight="?android:attr/listpreferreditemheightsmall"/> 

fragment_planet.xml

<imageview xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/image"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="#000000"     android:gravity="center"     android:padding="32dp" /> 

values > string.xml

<resources>     <string name="app_name">navigation drawer example</string>     <string-array name="planets_array">         <item>mercury</item>         <item>venus</item>         <item>earth</item>         <item>mars</item>         <item>jupiter</item>         <item>saturn</item>         <item>uranus</item>         <item>neptune</item>     </string-array>     <string name="drawer_open">open navigation drawer</string>     <string name="drawer_close">close navigation drawer</string>     <string name="action_websearch">web search</string>     <string name="app_not_available">sorry, there\'s no web browser available</string> </resources>