onclicklistener - how can I fire Onclick event programmatically in android? -

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i have custom view withe 2 lineat layouts : first view's header , second the details view.

in custom view, onclicklistener of header linearlayout defined: when fires, collapses/expandes second linearlayout.

what want add more functionalities header's onclicklistener event (ie : collapse/expand second layout , show toast).

i can't modify source code of custom view. tried set new onclicklistener hides initial event (collapse/expand).

how should implement this?

the source code of custom view: 

public class expandolayout extends viewgroup {     /* declarations */     private linearlayout header;     private linearlayout footer;      /* code */     @override     protected void onfinishinflate() {     header= new linearlayout(context);     header.setonclicklistener(new onclicklistener() {             @override             public void onclick(view v) {                 toggleexpand();             }         });     } }

what want add code defined onclicklistener event in activity. that: 

public class myactivity extends activity { private linearlayout mycustomview; @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.rsdetail);     mycustomview= (mycustomview) findviewbyid(r.id.expanded);      mycustomview.getchildat(0).setonclicklistener(new onclicklistener() {          @override         public void onclick(view v) {             if(v instanceof linearlayout)             {                 v.performclick();                  toast.maketext(getactivity(), "expandoonclicklistener", 2000).show();             }         }     }); }

simple solution original onclicklistener , fire in new one: 

final onclicklistener predefinedlistener = mycustomview.getchildat(0).getonclicklistner();  mycustomview.getchildat(0).setonclicklistener(new onclicklistener() {     @override     public void onclick(view v) {         if(v instanceof linearlayout)         {             predefinedlistener.onclick(v); // calls default (defined mycustomview)              toast.maketext(getactivity(), "expandoonclicklistener", 2000).show();         }     } });

sadly, view not have getonclicklistner(), guess can use reflection it. stored in field monclicklistener (source).

this how can onclicklistener defined layout:

onclicklistener tmponclicklistener = null; try {     class<view> cls = (class<view>) class.forname("android.view.view");     field fld = cls.getdeclaredfield("monclicklistener");     fld.setaccessible(true); // because protected      tmponclicklistener = (onclicklistener) fld.get(mycustomview.getchildat(0));      fld.setaccessible(false); // restore it's original property } catch (securityexception e) {     e.printstacktrace(); } catch (nosuchfieldexception e) {     e.printstacktrace(); } catch (illegalargumentexception e) {     e.printstacktrace(); } catch (illegalaccessexception e) {     e.printstacktrace(); } catch (classnotfoundexception e) {     e.printstacktrace(); }   final onclicklistener predefinedlistener = tmponclicklistener;  if (predefinedlistener != null) {     mycustomview.getchildat(0).setonclicklistener(new onclicklistener() {         @override         public void onclick(view paramview) {             predefinedlistener.onclick(paramview);              toast.maketext(getactivity(), "expandoonclicklistener", toast.length_long).show();         } });

i didn't bother handle exception correctly, it's enough idea. might messy, it's 5 lines of new code solve problem.


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