android - Properly replacing Fragments -


i'm wondering proper way change fragments, add them backstack, , restore visibile fragment after screen rotation.
currently, use method initialize first fragment:

private void inflateinitialfragment() {     fragmentmanager manager = getfragmentmanager();     fragment mainfragment = manager.findfragmentbytag(mainmenufragment.class.getsimplename());     fragmenttransaction ft = manager.begintransaction();     if (mainfragment == null) {       ft.replace(r.id.maincontainer, new mainmenufragment(), mainmenufragment.class.getsimplename());     } else if (!(mainfragment.isadded() && !mainfragment.isdetached() && !mainfragment.isremoving())) {       ft.replace(r.id.maincontainer, mainfragment, mainmenufragment.class.getsimplename());     }     ft.commit();     manager.executependingtransactions(); }

and display new fragments have methods one:

public void openawards() {    getfragmentmanager().begintransaction().replace(r.id.maincontainer,     new awardsfragment(), awardsfragment.class.getsimplename()).addtobackstack(null).commit(); }

and go main screen:

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

after few screen rotations, i've got crashes one:

java.lang.illegalstateexception: fragment added: mainmenufragment{42c64d90 #0 id=0x7f0b003f mainmenufragment}

how should change visible fragments , restore them after screen rotation?
don't think saving string or fragment each time solution restore them.

if activity extends android.app.activity don't need override onbackpressed(). pop fragments stack automatically.


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