android - Fragment Switching in the same Activity restarts the same Fragment -

i working on application.
somewhere want load fragment in activity , when gridview/listview item clicked on firstfragment, load secondfragment

i have added fragments way below:

mainactivity.java

@override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.form_creation_view);      fragment fragment = new firstfragment();     fragmentmanager fragmentmanager = getsupportfragmentmanager();     fragmenttransaction fragmenttransaction = fragmentmanager.begintransaction();     fragmenttransaction.add(r.id.form_view, fragment).commit();  } 

second fragment:

fragment fragment = new secondfragment(); fragmentmanager fragmentmanager = getsupportfragmentmanager(); fragmenttransaction fragmenttransaction = fragmentmanager.begintransaction(); fragmenttransaction.addtobackstack(null); fragmenttransaction.replace(r.id.form_view, fragment).commit(); 

onbackpress of mainactivity.java :

@override public void onbackpressed() {     if(getfragmentmanager().getbackstackentrycount() == 0) {         super.onbackpressed();     } else {         getfragmentmanager().popbackstack();     } } 

so, when press backbutton on mainactivity when secondfragment loaded, switches firstfragment, calls oncreateview() method of firstfragment again.

the firstfragment has recyclerview inside , send api request in oncreateview() method server in order load data recyclerview.

now when come again fragment secondfragment, want request should not executed , data should populated recyclerview.

how can achieve this?
can please me here?

in oncreateview, should check this:

    if(mlist.size() == 0){         //make api call     }else{         //set recyclerview adapter     } 

this way, when come secondfragment can repopulate recyclerview.

you should consider saving list on onsaveinstancestate