java - How to generically retrieve all children of a certain type in a root layout? -

what mean question (if stated ambiguously, couldn't find answer question) take root layout, children of layout, , perform callback on instanceof specified type.

now, can in fixed way, doing like...

relativelayout root = (relativelayout) findviewbyid(r.id.root_layout);     for(int = 0; <= root.getchildcount(); i++){         view v = root.getchildat(i);         if(v instanceof customlayout){             // callback on view.         }     } 

thing is, want make more generic. should able use layout, , check see if instance of layout. in particular, want generic enough used (if possible). of course don't mind stopping @ settling layouts.

i want build collection of these children , return them, if possible of same type. haven't done java in long while i'm rusty, thinking of using reflection accomplish this. @ possible?

if pass class of type want, possible?

edit:

i didn't see dtann's answer before, must have missed it, did on own , looks similar his. implementation went along lines of this

public static abstract class callbackonrootchildren<t> {         @suppresswarnings("unchecked")         public void callonchildren(class<t> clazz, viewgroup root) {             for(int = 0; < root.getchildcount(); i++){                 view v = root.getchildat(i);                 if(v instanceof viewgroup){                     callonchildren(clazz, (viewgroup) v);                 }                 if(clazz.isassignablefrom(v.getclass())){                     // check see if assignable ensures it's type safe.                     onchild((t) v);                 }             }         }          public abstract void onchild(t child);     } 

difference mine relies on callbacks , whatnot, overall same concept.

try following code:

public <t> list<t>  getviewsbyclass(view rootview, class<t> targetclass) {     list<t> items = new arraylist<>();     getviewsbyclassrecursive(items,rootview,targetclass);     return items; }  private void getviewsbyclassrecursive(list items, view view, class clazz) {     if (view.getclass().equals(clazz)) {         log.d("tag","found " + view.getclass().getsimplename());         items.add(view);     }      if (view instanceof viewgroup) {         viewgroup viewgroup = (viewgroup)view;         if (viewgroup.getchildcount() > 0) {             (int = 0; < viewgroup.getchildcount(); i++) {                 getviewsbyclassrecursive(items, viewgroup.getchildat(i), clazz);             }         }     } } 

call getviewsbyclass , pass in root layout , target class. should receive list of views instance of target class. include root layout if instance of target class. method search entire view tree of root layout.