xml - android.view.MenuItem android.view.MenuItem.setVisible(boolean)' on a null object reference -

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public boolean onprepareoptionsmenu(menu menu) {         boolean draweropen = mdrawerlayout.isdraweropen(mdrawerlist);         menu.finditem(r.id.action_websearch).setvisible(!draweropen);         return super.onprepareoptionsmenu(menu); }  <menu xmlns:android="http://schemas.android.com/apk/res/android">         <item android:id="@+id/action_websearch"         android:icon="@drawable/action_search"         android:title="@string/action_websearch"         android:showasaction="ifroom|withtext"/> </menu>


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