android - How to make particular tab in FragmentTabHost has multiple fragment navigations like tabgroupactivity -

i created 3 tabs using fragmenttabhost. need make navigation under tabs. how can this. need get using tabgroupactivity.

tab1 --->frag1-->frag2

tab2 --->frag3

tab3 --->frag4--->frag5

i have used fragmenttransaction.add(), fragmenttransaction.remove(), fragmenttransaction.replace(). these 3 methods nothing give solution.

replace method shows new fragment view on top of existing fragment view.

remove , add, these 2 remove works, add not works.

thanks in advance.

tabhostmain.java

    @override     protected void oncreate(bundle savedinstancestate)  {      super.oncreate(savedinstancestate);     setcontentview(r.layout.bottom_tabs);  mtabhost = (fragmenttabhost) findviewbyid(android.r.id.tabhost);                 mtabhost.setup(this, getsupportfragmentmanager(), r.id.realtabcontent);             view view;     view=gettabview(r.drawable.ic_launcher);      bundle b = new bundle();     b.putstring("key", "simple");     mtabhost.addtab(mtabhost.newtabspec("simple").setindicator(view),fragment1.class, null);      b = new bundle();     b.putstring("key", "contacts");     view=gettabview(r.drawable.ic_launcher);     mtabhost.addtab(mtabhost.newtabspec("contacts").setindicator(view), fragment2.class, null);      b = new bundle();     b.putstring("key", "custom");     view=gettabview(r.drawable.ic_launcher);     mtabhost.addtab(mtabhost.newtabspec("custom").setindicator(view),fragment3.class, null);  } 

fragment3.java

@override     public view oncreateview(layoutinflater inflater, viewgroup container,bundle savedinstancestate) {          view view=layoutinflater.from(getactivity()).inflate(r.layout.activity_second, null);          ((textview)view.findviewbyid(r.id.second_act_text)).setonclicklistener(new onclicklistener() {              @override             public void onclick(view v) {                 fragmentmanager fm=getchildfragmentmanager();                 fragmenttransaction fragmenttransaction=fm.begintransaction();                 fragmenttransaction.replace(r.id.second_activity, new fragment1()).addtobackstack(null).commit();             }         });         return view;     } 

the concept of different fragment navigation stacks in each tab has been discussed quite few times on stackoverflow, 1 example instance:

separate stack each tab in android using fragments

one simple/crude way of achieving without having manage own custom navigation stack have root fragment under each tab, , whenever root fragment wants navigate fragment (fragment b) show new activity fragment b , activity have own fragment navigation stack.

tab1 --->root frag1 --> activity (own nav stack) --> frag2

tab2 --->root frag3

tab3 --->root frag4 --> activity (own nav stack) --> frag5 --> frag6 --> frag7

an example of app stackanywhere app. makes heavy use of tabs, when navigate within tabs moves navigation new activity. ymmv approach, however.