android - Adding a button for each group in an ExpandableListView -

i'm using expandablelistview group items , child items generated data get. need button on bottom of each generated group onclicklistener invokes function has know group button affiliated to.

adding list_group.xml layout file add button on sample data title-header , adding list_item.xml add every single sample data-textview element.

it's first project using android studio , got stuck trying fix problem.

here screenshot of how list looks like
i'm trying add button button item is.

this function fill list data:

private void preparelistdata(ccypair[] ccypairs) {             listdataheader = new arraylist<string>();             listdatachild = new hashmap<string, list<string>>();             int counter = 0;             // adding child data             (ccypair p : ccypairs){                 listdataheader.add("sample data title");                 list<string> tempexpinfo = new arraylist<string>();                 tempexpinfo.add("sample data");                 tempexpinfo.add("sample data");                 tempexpinfo.add("sample data");                 tempexpinfo.add("sample data");                 tempexpinfo.add("sample data");                 tempexpinfo.add("sample data");                 tempexpinfo.add("button");                 listdatachild.put(listdataheader.get(counter), tempexpinfo);                 counter++;             }         } 

list_group.xml file:

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:orientation="vertical"     android:padding="8dp"     android:background="@color/colorexpandablelist">       <textview         android:id="@+id/lbllistheader"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:paddingleft="?android:attr/expandablelistpreferreditempaddingleft"         android:textsize="17dp"         android:paddingtop="10dp"         android:paddingbottom="10dp"         android:background="@color/colorexpandablelist"         android:textcolor="#2282c1"         android:layout_alignparenttop="true"/>  </relativelayout> 

list_item.xml file:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:background="@color/colorexpandablelist"><![cdata[     android:orientation="vertical" >        ]]>      <textview         android:id="@+id/lbllistitem"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:background="@color/colorexpandablelist"         android:paddingbottom="5dp"         android:paddingleft="?android:attr/expandablelistpreferredchildpaddingleft"         android:paddingtop="5dp"         android:textsize="17dip" />   </linearlayout> 

and expandablelistadapter

public class expandablelistadapter extends baseexpandablelistadapter {      private context _context;     private list<string> _listdataheader; // header titles     // child data in format of header title, child title     private hashmap<string, list<string>> _listdatachild;      public expandablelistadapter(context context, list<string> listdataheader, hashmap<string, list<string>> listchilddata) {         this._context = context;         this._listdataheader = listdataheader;         this._listdatachild = listchilddata;     }      @override     public object getchild(int groupposition, int childposititon) {         return this._listdatachild.get(this._listdataheader.get(groupposition))                 .get(childposititon);     }      @override     public long getchildid(int groupposition, int childposition) {         return childposition;     }      @override     public view getchildview(int groupposition, final int childposition,                              boolean islastchild, view convertview, viewgroup parent) {          final string childtext = (string) getchild(groupposition, childposition);          if (convertview == null) {             layoutinflater infalinflater = (layoutinflater) this._context                     .getsystemservice(context.layout_inflater_service);             convertview = infalinflater.inflate(r.layout.list_item, null);         }          textview txtlistchild = (textview) convertview                 .findviewbyid(r.id.lbllistitem);          txtlistchild.settext(childtext);         return convertview;     }      @override     public int getchildrencount(int groupposition) {         return this._listdatachild.get(this._listdataheader.get(groupposition))                 .size();     }      @override     public object getgroup(int groupposition) {         return this._listdataheader.get(groupposition);     }      @override     public int getgroupcount() {         return this._listdataheader.size();     }      @override     public long getgroupid(int groupposition) {         return groupposition;     }      @override     public view getgroupview(int groupposition, boolean isexpanded, view convertview, viewgroup parent) {         string headertitle = (string) getgroup(groupposition);         if (convertview == null) {             layoutinflater infalinflater = (layoutinflater) this._context                     .getsystemservice(context.layout_inflater_service);             convertview = infalinflater.inflate(r.layout.list_group, null);         }          textview lbllistheader = (textview) convertview                 .findviewbyid(r.id.lbllistheader);         lbllistheader.settypeface(null, typeface.bold);         lbllistheader.settext(headertitle);          return convertview;     }      @override     public boolean hasstableids() {         return false;     }      @override     public boolean ischildselectable(int groupposition, int childposition) {         return true;     } } 

getchildview() method wanna look

first option:

in getchildview() method have distinguish view want inflate.

if(islastchild){     convertview = inflater.inflate(r.layout.list_item_with_button, null); } else {     convertview = inflater.inflate(r.layout.list_item, null); } 

for last child create list_item_with_button.xml contains button component. can check islastchild boolean flag inflate new layout button @ last position.

second option: can edit existing list_item.xml , add button it, show @ last position by

view button = convertview.findviewbyid(r.id.mybutton); if(islastchild){     v.setvisibility(view.visible); } else {     v.setvisibility(view.gone); }