android - How to pass data from activity to it's own fragment? -

i want pass data activity fragment manages. have been trying code below: activity code:

string accountnumber = getintent().getstringextra("accountnumber").tostring(); fragment fragment = new fragment();         bundle bundle = new bundle();         bundle.putstring("accountnumber", accountnumber);         fragment.setarguments(bundle); 

fragment code inside oncreateview method:

bundle args = getarguments();         if (args != null && args.containskey("accountnumber")) {             accountnumber = args.getstring("accountnumber").tostring();             toast toast = toast.maketext(getactivity(), accountnumber, toast.length_short);             toast.show();         } 

the string accountnumber intent.getextra not null, when pass fragment accountnumber results null ...

i tried fragmentmanager in activity class this:

public void oncreate(bundle savedinstancestate) {     // ...     if (savedinstancestate == null) {         fragmentmanager fragmentmanager = getfragmentmanager()         // or: fragmentmanager fragmentmanager = getsupportfragmentmanager()         fragmenttransaction fragmenttransaction = fragmentmanager.begintransaction();         fragment fragment = new fragment();         bundle bundle = new bundle();             bundle.putstring("accountnumber", accountnumber);             fragment.setarguments(bundle);         fragmenttransaction.replace(r.id.fragment_container, fragment);         fragmenttransaction.commit();     } } 

check kind of "fragment" did import in activity. importing , instantiating "android.app.fragment" while expecting argument magically show in "com.my.application.fragment".