android - SharedPreferences into a ViewPager -


i need load preferences.xml file based on sharedpreferences viewpager. getting error:

java.lang.illegalstateexception: content view not yet created

i searching solution can't found anything. can do?

mainactivity.java

public class mainactivity extends fragmentactivity {      private customviewpager customviewpager;      @override     protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main_layout);         customviewpager = (customviewpager) findviewbyid(r.id.pager);         customviewpager.setadapter(new custompageradapter());         customviewpager.setpagemargin(0);         preferencemanager.setdefaultvalues(this, r.xml.preferences, false);     }      private class custompageradapter extends pageradapter {          @override         public object instantiateitem(viewgroup viewgroup, int position) {             relativelayout viewlayout = null;             layoutinflater inflater = (layoutinflater) viewgroup.getcontext().getsystemservice(context.layout_inflater_service);             switch (position) {              case 0:                 viewlayout = (relativelayout) inflater.inflate(r.layout.list_meetings, null);                 viewgroup.addview(viewlayout, 0);                 break;              case 1:                 viewlayout = (relativelayout) inflater.inflate(r.layout.settings, null);                 viewgroup.addview(viewlayout, 0);                  getfragmentmanager().begintransaction().replace(android.r.id.content, new fragmentpreferences()).commit();                 break;             }             customviewpager.setobjectforposition(viewlayout, position);             return viewlayout;         }          @override         public int getcount() {             return 2;         }          @override         public boolean isviewfromobject(view view, object object) {             return view == object;         }     }      public static class fragmentpreferences extends preferencefragment {          @override         public void oncreate(bundle savedinstancestate) {             super.oncreate(savedinstancestate);             addpreferencesfromresource(r.xml.preferences);         }          @override         public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {              // view view = inflater.inflate(r.layout.settings, null);             // return view;              return null;         }     } }

settings.xml

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical" >      <listview         android:id="@android:id/list"         android:layout_width="match_parent"         android:layout_height="wrap_content" />  </relativelayout>

preferences.xml

<?xml version="1.0" encoding="utf-8"?> <preferencescreen xmlns:android="http://schemas.android.com/apk/res/android">      <listpreference         android:key="speed_setting"         android:title="@string/speed_setting_title"         android:summary="@string/speed_setting_description"         android:dialogtitle="@string/speed_setting_title"         android:entries="@array/speed_setting_entry_labels"         android:entryvalues="@array/speed_setting_entry_labels"         android:defaultvalue="@string/speed_setting_default_value"         android:icon="@drawable/ic_list_speed_setting" />     <listpreference         android:key="permission_type_setting"         android:title="@string/permission_type_setting_title"         android:summary="@string/permission_type_setting_description"         android:dialogtitle="@string/permission_type_setting_title"         android:entries="@array/permission_type_setting_entry_labels"         android:entryvalues="@array/permission_type_setting_entry_labels"         android:defaultvalue="@string/permission_type_setting_default_value"         android:icon="@drawable/ic_list_permission_type_setting" />     <listpreference         android:key="sensibility_setting"         android:title="@string/sensibility_setting_title"         android:summary="@string/sensibility_setting_description"         android:dialogtitle="@string/sensibility_setting_title"         android:entries="@array/sensibility_setting_entry_labels"         android:entryvalues="@array/sensibility_setting_entry_labels"         android:defaultvalue="@string/sensibility_setting_default_value"         android:icon="@drawable/ic_list_sensibility_setting" />     <listpreference         android:key="time_format_setting"         android:title="@string/time_format_setting_title"         android:summary="@string/time_format_setting_description"         android:dialogtitle="@string/time_format_setting_title"         android:entries="@array/time_format_setting_entry_labels"         android:entryvalues="@array/time_format_setting_entry_labels"         android:defaultvalue="@string/time_format_setting_default_value"         android:icon="@drawable/ic_list_time_format_setting" />     <listpreference         android:key="maps_setting"         android:title="@string/maps_setting_title"         android:summary="@string/maps_setting_description"         android:dialogtitle="@string/maps_setting_title"         android:entries="@array/maps_setting_entry_labels"         android:entryvalues="@array/maps_setting_entry_labels"         android:defaultvalue="@string/maps_setting_default_value"         android:icon="@drawable/ic_list_maps_setting" />     <listpreference         android:key="resource_consumption_setting"         android:title="@string/resource_consumption_setting_title"         android:summary="@string/resource_consumption_setting_description"         android:dialogtitle="@string/resource_consumption_setting_title"         android:entries="@array/resource_consumption_setting_entry_labels"         android:entryvalues="@array/resource_consumption_setting_entry_labels"         android:defaultvalue="@string/resource_consumption_setting_default_value"         android:icon="@drawable/ic_list_resource_consumption_setting" /> </preferencescreen>

use preferencefragment. available after api level 11. can find details clear example in link


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