xml - How to get all selected checkbox from a ExpandableListView in Android? -

i have expandablelistview has groups , itens, each iten has checkbox can selected , want know how can iterate on itens , values when click button.

so far have created list, can select checkboxes , going well, cant find solution values checkboxes when click button. questionary, when user finishes picking choices, submit values.

i have mainactivity, expandablelistadapter list adapter implementation , have 3 xml, activity_main.xml, list_group.xml , list_itens.xml.

here code far:

public class expandablelistadapter extends baseexpandablelistadapter { private context context; private list<string> listadeperguntas; private hashmap<string, list<string>> listaderespostas; private checkbox check;     public expandablelistadapter(context context, list<string> listadeperguntas, hashmap<string, list<string>> listaderespostas) {     this.context = context;     this.listadeperguntas = listadeperguntas;     this.listaderespostas = listaderespostas; }  @override public int getgroupcount() {     return listadeperguntas.size(); }  @override public int getchildrencount(int groupposition) {     return listaderespostas.get(listadeperguntas.get(groupposition)).size(); }  @override public object getgroup(int groupposition) {     return listadeperguntas.get(groupposition); }  @override public object getchild(int groupposition, int childposition) {     return listaderespostas.get(listadeperguntas.get(groupposition)).get(childposition); }  @override public long getgroupid(int groupposition) {     return groupposition; }  @override public long getchildid(int groupposition, int childposition) {     return childposition; }  @override public boolean hasstableids() {     return false; }  @override public view getchildview(int groupposition, int childposition, boolean islastchild, view convertview, viewgroup parent) {     string resposta = (string) getchild(groupposition, childposition);     if(convertview == null) {         layoutinflater inflater = (layoutinflater) this.context.getsystemservice(context.layout_inflater_service);         convertview = inflater.inflate(r.layout.list_itens, null);     }     textview text = (textview) convertview.findviewbyid(r.id.listitem);     text.settext(resposta);     return convertview; }  @override public view getchildview(final int groupposition, final int childposition, boolean islastchild, view convertview, viewgroup parent) {     string resposta = (string) getchild(groupposition, childposition);      if(convertview == null) {         layoutinflater inflater = (layoutinflater) this.context.getsystemservice(context.layout_inflater_service);         convertview = inflater.inflate(r.layout.list_itens, null);     }     textview text = (textview) convertview.findviewbyid(r.id.listitem);     text.settext(resposta);      checkbox check = (checkbox) convertview.findviewbyid(r.id.listcheckitem);     //check.setfocusable(false);      check.setoncheckedchangelistener(new compoundbutton.oncheckedchangelistener() {         @override         public void oncheckedchanged(compoundbutton buttonview, boolean ischecked) {             toast.maketext(buttonview.getcontext(), "selected! - question number: " + groupposition + "answer: " + childposition + "ischecked: " + ischecked, toast.length_short).show();          }     });     return convertview; }  @override public boolean ischildselectable(int groupposition, int childposition) {     return true; } 

}

my mainactivity class:

public class mainactivity extends appcompatactivity implements view.onclicklistener{     private expandablelistview listview;     private expandablelistadapter listadapter;      private list<string> perguntas;     private hashmap<string, list<string>> respostas;      private button enviarrespostas;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      listview = (expandablelistview) findviewbyid(r.id.expandablelistview);      carregardados();      listadapter = new expandablelistadapter(this, perguntas, respostas);     listview.setadapter(listadapter);      listview.setonchildclicklistener(new expandablelistview.onchildclicklistener() {         @override         public boolean onchildclick(expandablelistview parent, view v, int groupposition, int childposition, long id) {             toast.maketext(mainactivity.this, "clicou no:" + groupposition + " item: " + childposition, toast.length_short).show();             return false;         }     });      listview.setongroupclicklistener(new expandablelistview.ongroupclicklistener() {         @override         public boolean ongroupclick(expandablelistview parent, view v, int groupposition, long id) {             toast.maketext(mainactivity.this, "clicou no:" + groupposition, toast.length_short).show();             return false;         }     });      enviarrespostas = (button) findviewbyid(r.id.buttonenviarrespostas);     enviarrespostas.setonclicklistener(this);  }   private void carregardados() {     perguntas = new arraylist<>();     respostas = new hashmap<>();      perguntas.add("pertunta 1");     perguntas.add("pertunta 2");     perguntas.add("pertunta 3");     perguntas.add("pertunta 4");      list<string> respostaspergunta1 = new arraylist<>();     respostaspergunta1.add("sim");     respostaspergunta1.add("não");     respostaspergunta1.add("talvez");      list<string> respostaspergunta2 = new arraylist<>();     respostaspergunta2.add("10");     respostaspergunta2.add("20");     respostaspergunta2.add("30");     respostaspergunta2.add("40");      list<string> respostaspergunta3 = new arraylist<>();     respostaspergunta3.add("sim");     respostaspergunta3.add("não");      list<string> respostaspergunta4 = new arraylist<>();     respostaspergunta4.add("10");     respostaspergunta4.add("20");     respostaspergunta4.add("30");     respostaspergunta4.add("40");     respostaspergunta4.add("50");     respostaspergunta4.add("60");      respostas.put(perguntas.get(0), respostaspergunta1);     respostas.put(perguntas.get(1), respostaspergunta2);     respostas.put(perguntas.get(2), respostaspergunta3);     respostas.put(perguntas.get(3), respostaspergunta4); }  @override public void onclick(view v) {     //todo } 

}

and here 3 .xml files:

1) activity_main.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="wrap_content"     android:layout_height="match_parent"     android:padding="10dp"     android:weightsum="1">   <expandablelistview     android:id="@+id/expandablelistview"     android:layout_width="match_parent"     android:layout_height="437dp" />  <button     android:id="@+id/buttonenviarrespostas"     android:layout_width="match_parent"     android:layout_height="35dp"     android:text="button" />  </linearlayout> 

2) list_group.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical" android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="8dp"     android:background="@android:color/white">      <textview         android:id="@+id/header"         android:paddingleft="?         android:attr/expandablelistpreferreditempaddingleft"         android:textsize="16dp"         android:textcolor="@android:color/black"         android:layout_width="match_parent"         android:layout_height="/>  </linearlayout> 

3) list_itens.xml

<tablelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical" android:layout_width="match_parent"     android:layout_height="match_parent"     android:stretchcolumns="0">      <tablerow>         <textview             android:id="@+id/listitem"             android:textsize="16dp"             android:paddingleft="?             android:attr/expandablelistpreferredchildpaddingleft"             android:paddingtop="5dp"             android:paddingbottom="5dp"             android:layout_width="match_parent"             android:layout_height="wrap_content" />         <checkbox             android:id="@+id/listcheckitem"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_marginright="50dp" />     </tablerow> </tablelayout>