android - webview fragment press back to return to -

hi have android app recycleview. when user click button on recycle viewholder. app launch webview (inside fragment). want handle when user click button, webview goback if there history, , if there no history, app close webview fragment , come recycleview.

i have successfull handle when there history (but webview can not come recycle view if there no history

here webview code

webview.setonkeylistener(new view.onkeylistener() {                  public boolean onkey(view v, int keycode, keyevent event) {                     if (keycode == keyevent.keycode_back) {                         if (webview.cangoback()) {                             webview.goback();                         }else {                             getactivity().getsupportfragmentmanager().popbackstack();                         }                         return true;                     }                     return false;                 }              }); 

anything wrong these code? appreciate. thanks

edit use these code inside recycleview adapter class handle button click on viewholder class

url.setonclicklistener(new view.onclicklistener() {                 @override                 public void onclick(view view) {                     bundle bundle = new bundle();                     bundle.putstring("topstoryurl", topstories.get(getlayoutposition()).geturl());                      topstorywebview topstorywebviewfragment = new topstorywebview();                     topstorywebviewfragment.setarguments(bundle);                     if (itemlistactivity.mtwopane) {                          ((fragmentactivity) context).getsupportfragmentmanager()                                 .begintransaction()                                 .add(r.id.item_detail_container, topstorywebviewfragment)                                 .commit();                     } else {                         topstorywebviewfragment.setarguments(bundle);                         ((fragmentactivity) context).getsupportfragmentmanager()                                 .begintransaction()                                 .add(r.id.framelayout, topstorywebviewfragment)                                 .commit();                     }                 }             }); 

addtobackstack add fragment stack, , can access stack later

((fragmentactivity) context).getsupportfragmentmanager() .begintransaction() .add(r.id.item_detail_container, topstorywebviewfragment)  // add transaction stack (name optional name stack state, or null).  .addtobackstack(null)  .commit();