android - How can I identify the current fragment of my activity while using tabs and fragment container? -

i want call fragment method activity, describe in so-question: findbyid

testfragment testfrag = (testfragment) getfragmentmanager().getfragmentbyid(r.id.testfragment);  if(testfrag != null && testfrag.isadded())     testfrag.testmethod("test"); 

as seen identify fragment id set in xml. have fragment container none of fragment layouts have id.

so seconds thought using function getfragmentbytag `like in tags

fragmenttransaction.replace(r.id.frametitle, casinodetailfragment, "fragmenttag"); 

• but use action bar tabs don't have tags:

my activity:

@override protected void oncreate(bundle savedinstancestate) {   super.oncreate(savedinstancestate);   setcontentview(r.layout.activity_fragmentcontainer);    // actionbar gets initiated   actionbar actionbar = getactionbar();   actionbar.setnavigationmode(actionbar.navigation_mode_tabs);    // define tabs   actionbar.tab basicinfotab = actionbar.newtab().settext(       r.string.tab_baseinfo);   ..    // define fragments   plantbasicinfofragment basicinfofragment = new plantbasicinfofragment();   ..    // set tablisteners   basicinfotab.settablistener(new tablistener(basicinfofragment));   ..    // add tabs actionbar   actionbar.addtab(basicinfotab);   ..    // icon clickable   actionbar.setdisplayhomeasupenabled(true); } 

and layout:

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_gravity="center">        <linearlayout            android:orientation="horizontal"           android:id="@+id/labeledobjectheaderinfo"           android:layout_width="match_parent"           android:layout_height="wrap_content"            >           <!-- ... -->     </linearlayout >          <!-- fragment container -->    <linearlayout           android:orientation="horizontal"           android:id="@+id/fragment_container"           android:layout_width="match_parent"           android:layout_height="match_parent"           >    </linearlayout>  </linearlayout> 

one of fragments:

<?xml version="1.0" encoding="utf-8"?>      <tablelayout         xmlns:android="http://schemas.android.com/apk/res/android"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignparentleft="true"         android:layout_alignparenttop="true"         android:id="@+id/table">          <tablerow>           <!-- ... -->         </tablerow>          <!-- ... -->     </tablelayout> 

and tab listener

public class tablistener implements actionbar.tablistener {    public fragment fragment;    public tablistener(fragment fragment) {     this.fragment = fragment;   }     @override   public void ontabreselected(tab tab, fragmenttransaction ft) {    }    @override   public void ontabselected(tab tab, fragmenttransaction ft) {      ft.replace(r.id.fragment_container, fragment);   }    @override   public void ontabunselected(tab tab, fragmenttransaction ft) {      ft.remove(fragment);    }  } 

so how can identify current fragment?

thanks in advance

p.s. whole tab switching works perfectly, want build addional feature inside activity!

add tag while creating tabs.

actionbar.tab basicinfotab = actionbar.newtab().settext(r.string.tab_baseinfo); basicinfotab.settag("tab1"); 

and in listener class, retrieve tag upon event.

@override public void ontabselected(tab tab, fragmenttransaction ft) {     string tabid = tab.gettag().tostring();  } 

this way current tag. identify current fragment, can keep stack of fragments , pick right 1 on tab change.

edit

the tabid, aforementioned, identifies tab which. in order set fragment id/tag, there many ways depending on needs. 1 method replace actual fragment layout intermediate layout.

for instance, fragment want add fragment container. create fragment class called intermediatefragment following layout.

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal"  android:baselinealigned="false">  <fragment     android:id="@+id/fragmentid"     android:layout_width="match_parent"     android:layout_height="match_parent"     class="classa" />  </linearlayout>  

now assign layout mentioned in post (containing table) new 1 , add fragment class a. add intermediate fragment container in turn pulls fragment a. identify fragment id/tag added in layout.

hope makes sense!