java - Trying to deselect a view using getChildAt() -

i'm using gridview inside expandablelistview

i have function highlights item when clicked, i'm trying implement button when pressed unselect selected items, unselecting last view clicked

public class gridadapter extends baseadapter {      private context mcontext;     private arraylist<filhos> child;     public arraylist<cadastraescolas> escola;     private arraylist<arraylist<filhos>> filhos = new arraylist();        public gridadapter(context context, arraylist<cadastraescolas> groups, arraylist<filhos> childvalues, int groupposition) {         mcontext = context;         child = childvalues;         escola = groups;         posicaoescola = groupposition;       }       @override     public int getcount() {         return child.size();     }      @override     public object getitem(int position) {         return position;     }      @override     public long getitemid(int arg0) {         return 0;     }      @override     public view getview(final int position, view convertview, final viewgroup parent) {           holder = null;            if (convertview == null) {             layoutinflater inflater = (layoutinflater) mcontext                     .getsystemservice(context.layout_inflater_service);             convertview = inflater.inflate(r.layout.child_item, null);             holder = new viewholder();               final textview idaluno = (textview) convertview.findviewbyid(r.id.idcrianca);             final textview nomealuno = (textview) convertview.findviewbyid(r.id.name);                convertview.settag(holder);              final view finalconvertview = convertview;             convertview.setonclicklistener(new view.onclicklistener() {                 @override                 public void onclick(view v) {                          if (list.size() > 0) {                          ischecked = filhos.get(posicaoescola).get(position).ischecked();                           if (!ischecked) {                              selecao(true, position, nomealuno, 0xffffffff, finalconvertview, view.visible);                           } else {                              selecao(false, position, nomealuno, 0xffd5672b, finalconvertview, view.gone);                          }                        ex.findviewbyid(r.id.notificar).setonclicklistener(new view.onclicklistener() {                         @override                         public void onclick(final view v) {                               limpaselecao(false, position, nomealuno, 0xffd5672b, parent, view.gone);                            }                     });                   }             });           } else {             holder = (viewholder) convertview.gettag();         }          holder.text.settext(child.get(position).getnome());           return convertview;       }       static class viewholder {         textview text;     }       public void selecao(boolean check, int position, textview nomealuno, int color, view v, int visibility) {     filhos.get(posicaoescola).get(position).setchecked(check);     nomealuno.settextcolor(color);     v.findviewbyid(r.id.overlay).setvisibility(visibility);     v.findviewbyid(r.id.overlaytext).setvisibility(visibility); }  public void limpaselecao(boolean check, int position, textview nomealuno, int color, viewgroup v, int visibility) {        (int x = 0; x < group.size(); x++) {          (int j = 0; j < group.get(x).getalunos().size(); j++) {               if(filhos.get(x).get(j).ischecked()){                 v.getchildat(j).findviewbyid(r.id.loadingpanel).findviewbyid(r.id.overlay).setvisibility(view.gone);             }                nomealuno.settextcolor(color);         }     }   }  } 

layout:

<relativelayout                 android:layout_width="fill_parent"                 android:layout_height="wrap_content"                 android:orientation="vertical"                 android:background="@drawable/nomealuno_main"                 android:layout_below="@+id/child">                  <view                     android:id="@+id/overlay"                     android:layout_width="125dp"                     android:layout_height="50dp"                     android:background="@color/bgoverlay"                     android:visibility="gone"/>  </relativelayout> 

here happening:

when select items b that:

and hit clear, remove selected children last group clicked:

i need remove them when click on clear, children no matter in group have removed.

expandableadapter:

public class expandlisttest extends baseexpandablelistadapter {       public static final int choice_mode_multiple = abslistview.choice_mode_multiple;       public static final int choice_mode_multiple_modal = abslistview.choice_mode_multiple_modal;      /**      * no child selected      */     public static final int choice_mode_none = abslistview.choice_mode_none;      /**      * 1 single choice per group      */     public static final int choice_mode_single_per_group = abslistview.choice_mode_single;      /**      * 1 single choice groups      */     public static final int choice_mode_single_absolute = 10001;      private context context;     public static arraylist<cadastraescolas> groups;     private arraylist<arraylist<filhos>> child = new arraylist();     private hashmap<string, gpsescolas> amap = new hashmap<string, gpsescolas>();     private hashmap<string, gpsescolas> hashtask = new hashmap<string, gpsescolas>();     public static arraylist<filhos> listchild;     private gridadapter adapter;     private securepreferences sessao;     public static customgridview gridview;     private sparsearray<sparsebooleanarray> checkedpositions;     private static final string log_tag = expandlistadapter.class.getsimplename();       public expandlisttest(context context, arraylist<cadastraescolas> groups, hashmap<string, gpsescolas> data, securepreferences msessao, hashmap<string, gpsescolas> hashtask) {         this.context = context;         this.groups = groups;         this.amap = data;         this.sessao = msessao;         checkedpositions = new sparsearray<sparsebooleanarray>();         child = new arraylist();         if (groups != null) {             (int = 0; < groups.size(); i++) {                 child.add(i, groups.get(i).getalunos());             }         }     }       @override     public object getchild(int groupposition, int childposition) {         return child.get(childposition);     }      @override     public long getchildid(int groupposition, int childposition) {         return childposition;     }      @override     public view getchildview(final int groupposition, final int childposition,                              boolean islastchild, view convertview, final viewgroup parent) {           if (convertview == null) {             layoutinflater infalinflater = (layoutinflater) context                     .getsystemservice(context.layout_inflater_service);             convertview = infalinflater.inflate(r.layout.gridview, null);         }           listchild = new arraylist<filhos>();          (int j = 0; j < groups.get(groupposition).getalunos().size(); j++) {              listchild.add(child.get(groupposition).get(j));          }           gridview = (customgridview) convertview.findviewbyid(r.id.gridview_toolbar);          gridview.setexpanded(true);         adapter = new gridadapter(context, groups, listchild, child, groupposition, amap, hashtask, sessao);         gridview.setadapter(adapter);// adapter         gridview.setchoicemode(customgridview.choice_mode_multiple);            return convertview;      }       @override     public int getchildrencount(int ngroup) {         return 1;      }       @override     public object getgroup(int groupposition) {         return groups.get(groupposition);     }      @override     public int getgroupcount() {         return groups.size();     }      @override     public long getgroupid(int groupposition) {         return groupposition;     }      @override     public view getgroupview(int groupposition, boolean isexpanded,                              view convertview, viewgroup parent) {         cadastraescolas group = (cadastraescolas) getgroup(groupposition);         if (convertview == null) {             layoutinflater inf = (layoutinflater) context                     .getsystemservice(context.layout_inflater_service);             convertview = inf.inflate(r.layout.group_item, null);         }         expandablelistview mexpandablelistview = (expandablelistview) parent;         mexpandablelistview.expandgroup(groupposition);         textview tv = (textview) convertview.findviewbyid(r.id.group_name);         tv.settext(group.getnome_fantasia());          return convertview;     }      @override     public boolean hasstableids() {         return true;     }      @override     public boolean ischildselectable(int groupposition, int childposition) {         return true;     }  } 

android viewgroups can contain number of views, views can have 1 parent viewgroup, if try add view has parent, exception (from viewgroup.addviewinner()):

throw new illegalstateexception("the specified child has parent. " +                 "you must call removeview() on child's parent first."); 

this means structure of layouts of tree (not graph), , can use tree traversal algorithm iterate through every view of layout.

the following 1 of possible algorithms, post-order traversal.

it goes through root element, takes first child , makes recursive call algorithm, it's second, third etc...when there no children left go through, calls deselect function node.

for tree in diagram, nodes unselected in order:

a,c,e,d,b,h,i,g, f

public void onclickthebutton(view view) {     unselectall(r.layout.your_layout); }  public void unselectall(view view) {     if(view instanceof viewgroup) {         for(int ii = 0 ; ii<(viewgroup)view.getchildrencount(); ii++) {             unselectall((viewgroup)view.getchildat(ii));         }     }     unselect(view); } 

you can find many other ways here: https://en.wikipedia.org/wiki/tree_traversal

it must learn how algorithms work if want ease programming experience.