Android ViewPager can not load 3rd Fragment -

i have encourage problem when load 3 fragments viewpager each time started activity, there 2 fragments (fragment 1 & fragment 2) loaded. dont know why fragment 3 not been load.

below code

activity

protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_register_testing);         // load pager data         viewpager = (viewpager) findviewbyid(r.id.pagertestingregister);         list<fragment> fragments = new arraylist<>();         fragments.add(new fragment1());         fragments.add(new fragment2());         fragments.add(new fragment3());          viewpager.setadapter(new registertestingfragmentpageradapter(getsupportfragmentmanager(), fragments)); 

}

activity ui

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/expense1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" tools:context=".expense1">  <tabhost     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:id="@+id/tabhost">      <linearlayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:orientation="vertical">         <horizontalscrollview             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:id="@+id/scrolltabhost"             android:fillviewport="true"             android:scrollbars="none">             <tabwidget                 android:id="@android:id/tabs"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:gravity="bottom"></tabwidget>         </horizontalscrollview>            <framelayout             android:id="@android:id/tabcontent"             android:layout_width="match_parent"             android:layout_height="wrap_content">              <android.support.v4.view.viewpager                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:persistentdrawingcache="all"                 android:id="@+id/pagertestingregister">             </android.support.v4.view.viewpager>         </framelayout>     </linearlayout> </tabhost> 

adapter

public class registertestingfragmentpageradapter extends fragmentpageradapter { list<fragment> fragments;  public registertestingfragmentpageradapter(fragmentmanager fragmentmanager, list<fragment> fragments){     super(fragmentmanager);     this.fragments = fragments; }  public registertestingfragmentpageradapter(fragmentmanager fragmentmanager){     super(fragmentmanager);     //this.fragments = fragments; }  @override public android.support.v4.app.fragment getitem(int position) {     return fragments.get(position); }  @override public int getcount() {     return fragments.size(); } 

}

this works me:

mviewpager.setoffscreenpagelimit(2); 

as mentioned angad tiwari in comment