android - The interaction fragments -

i have 1 activity , 2 fragments. in drawer menu have 2 items: fragment1 , fragment2. in fragment1 have edittext , button. when click on button - text field must recorded in listview of second fragment. please me, how can make this.

i changed code, when click on button application has stopped. please me.

mainactivity

public class mainactivity extends appcompatactivity implements screenone.onfragmentinteractionlistener {  drawer drawerresult; arraylist<string> arrayitems;   string message; @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);     setsupportactionbar(toolbar);       primarydraweritem item1 = new primarydraweritem()             .withname(r.string.navigation_menu_item1)             .withidentifier(1);      primarydraweritem item2 = new primarydraweritem()             .withname(r.string.navigation_menu_item2)             .withidentifier(2);      drawerresult = new drawerbuilder()             .withactivity(this)             .withtoolbar(toolbar)             .withactionbardrawertoggleanimated(true)             .withheader(r.layout.drawer_header)             .adddraweritems(item1)             .adddraweritems(item2)             .withondraweritemclicklistener(new drawer.ondraweritemclicklistener() {                 @override                 public boolean onitemclick(view view, int position, idraweritem draweritem) {                      fragmentmanager manager = getsupportfragmentmanager();                     fragmenttransaction transaction = manager.begintransaction();                     fragment fragment = new fragment();                      switch (position){                         case 1:                             fragment = new screenone();                             break;                         case 2:                             fragment = new screentwo(arrayitems);                             break;                     }                     transaction.replace(r.id.content, fragment);                     transaction.commit();                      return false;                 }             })             .build(); }  @override public void onbackpressed(){     if(drawerresult.isdraweropen()){         drawerresult.closedrawer();     }     else{         super.onbackpressed();     } } @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.menu_main, menu);     return true; }  @override public boolean onoptionsitemselected(menuitem item) {     // handle action bar item clicks here. action bar     // automatically handle clicks on home/up button, long     // specify parent activity in androidmanifest.xml.     int id = item.getitemid();      //noinspection simplifiableifstatement     if (id == r.id.action_settings) {         return true;     }      return super.onoptionsitemselected(item); }    @override public void onfragmentinteraction(string msg) {     arrayitems.add(msg); } 

}

screenone or fragment1

public class screenone extends fragment {  button btnadd; edittext et; private onfragmentinteractionlistener mlistener; arraylist<string> items;    @nullable @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     view view = inflater.inflate(r.layout.screen_one_fragment, container, false);      btnadd = (button) view.findviewbyid(r.id.btnadd);     et = (edittext) view.findviewbyid(r.id.et);      btnadd.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             string str = et.gettext().tostring();             mlistener.onfragmentinteraction(str);             items.add(str);             //updatedetail();         }     });      return view; }   public interface onfragmentinteractionlistener {      void onfragmentinteraction(string msg); }    @override public void onattach(activity activity) {     super.onattach(activity);     try {         mlistener = (onfragmentinteractionlistener) activity;     } catch (classcastexception e) {         throw new classcastexception(activity.tostring()                 + " должен реализовывать интерфейс onfragmentinteractionlistener");     } }  public void updatedetail() {     // генерируем некоторые данные     string newtime = string.valueof(system.currenttimemillis());     // Посылаем данные activity     mlistener.onfragmentinteraction(newtime); } 

}

screentwo or fragment2

public class screentwo extends fragment {  arrayadapter<string> adapter; arraylist<string> itemarray;  public screentwo(arraylist<string> itemarray){     this.itemarray = itemarray; }  @nullable @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     view view = inflater.inflate(r.layout.screen_two_fragment, container, false);      listview listview = (listview) view.findviewbyid(r.id.lvname);      itemarray = new arraylist<>();     itemarray.clear();      adapter = new arrayadapter<string>(getactivity(), android.r.layout.simple_list_item_1, itemarray);     listview.setadapter(adapter);     return view; } 

my guess add third method in interface onfragmentinteractionlistener, returns list<string> links, going list of links, stored screenone.

when screentwo attached (in onattach(activity) callback) activity, retrieve list , build ui based on it.

another thing declare "listener" interface, every time call onfragmentinteraction(string), notify listeners changes, occurred.