android - Expandable listview display child objects -

i want give adapter object has key value of object , arraylist of objects.

for instance

    ingredient beef = new ingredient("beef");     ingredient cheese = new ingredient("cheese");     ingredient salsa = new ingredient("salsa");     ingredient tortilla = new ingredient("tortilla");     ingredient ketchup = new ingredient("ketchup");     ingredient bun = new ingredient("bun");          recipe taco = new recipe("taco", arrays.aslist(beef, cheese, salsa, tortilla));     recipe quesadilla = new recipe("quesadilla", arrays.aslist(cheese, tortilla));     recipe burger = new recipe("burger", arrays.aslist(beef, cheese, ketchup, bun));      recipes = arrays.aslist(taco, quesadilla, burger); 

now how expandable adapter show group heading example taco, quesadilla, , burger. when expanded shows ingredients each? both need objects because next step in ingredients able select , deselect ingredients , pass new object.

my adapter

public class expandablelistadapter extends baseexpandablelistadapter {  private context _context; private arraylist<recipe> _listdataheader; // header titles // child data in format of header title, child title private hashmap<recipe, list<string>> _listdatachild;  //keep track of checks arraylist<arraylist<integer>> check_states = new arraylist<arraylist<integer>>();  public expandablelistadapter(context context, arraylist<recipe> listdataheader,                              hashmap<recipe, 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_create_team_child, null);     }      final checkbox chk = (checkbox) convertview.findviewbyid(r.id.checkboxchild);      chk.setoncheckedchangelistener(new compoundbutton.oncheckedchangelistener() {                                          @override                                         public void oncheckedchanged(compoundbutton buttonview, boolean ischecked) {                                                 if (ischecked == true){                                                     //_listdatachild.get(childposition)                                                 }                                         }                                     }     );      textview txtlistchild = (textview) convertview             .findviewbyid(r.id.teamnamechild);      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) {        if (convertview == null) {         layoutinflater infalinflater = (layoutinflater) this._context                 .getsystemservice(context.layout_inflater_service);         convertview = infalinflater.inflate(r.layout.list_item_create_team, null);     }      textview lbllistheader = (textview) convertview             .findviewbyid(r.id.teamname);     lbllistheader.settypeface(null, typeface.bold);     lbllistheader.settext(_listdataheader.get(groupposition).getname());      return convertview; }  @override public boolean hasstableids() {     return false; }  @override public boolean ischildselectable(int groupposition, int childposition) {     return true; } 

}

recipe object:

public class recipe implements parentlistitem {      private string mname;     private list<ingredient> mingredients;      public recipe(string name, list<ingredient> ingredients) {         mname = name;         mingredients = ingredients;     }      public string getname() {         return mname;     }      @override     public list<?> getchilditemlist() {         return mingredients;     }      @override     public boolean isinitiallyexpanded() {         return false;     } } 

ingredient object

public class ingredient {  private string mname;  public boolean isselected() {     return isselected; }  public void setisselected(boolean isselected) {     this.isselected = isselected; }  public string getmname() {     return mname; }  public void setmname(string mname) {     this.mname = mname; }  private boolean isselected;  public ingredient(string name) {     mname = name; }  public string getname() {     return mname; } 

}