android - No action After click on Button -

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i created 1 button in android app,but when clicking on button,nothing happens.

protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_search_data);     search =(button)findviewbyid(r.id.search);     search.setonclicklistener(new view.onclicklistener()   {         public void onclick(view v) {             try {                 new retrievedata().execute();             } catch (exception e) {                 e.printstacktrace();             }         }     }); }

try initialize button in oncreate();


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