java - Menu xml in MainActivity? -

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i'm going crazy! have source why goes error?

this menu.xml mainactivity

<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android" >         <group android:id="@+id/group1">         <item android:id="@+id/item1" android:title="x"></item>         <item android:id="@+id/item2" android:title="y"></item>         <item android:id="@+id/item3" android:title="z"></item>         <item android:id="@+id/item4" android:title="share"></item> </group> </menu>

and java file

@override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.              menuinflater inflater = getmenuinflater();             inflater.inflate(r.menu.menu_main, menu);             return true;         }         public boolean onoptionsitemselected(menuitem item) {             switch (item.getitemid()) {             case r.id.item1:                 code                 }             return true;             case r.id.item2: code             return true;             case r.id.item3: code                 return true;             case r.id.item4:                 intent intent = new intent(intent.action_send);                  intent.settype("text/plain");                  intent.putextra(intent.extra_text, "hxxx");                  intent.putextra(android.content.intent.extra_subject, "check out site!");  startactivity(intent.createchooser(intent, "share"));                 return true;             default:             return super.onoptionsitemselected(item);             }         }     }

why give me error in line: case r.id.item4: error multiple markers @ line - item4 cannot resolved or not field - item4 cannot resolved or not field

i'm guessing menu.xml file saved in 'res/menu/menu.xml'. if so, try:

 public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.          menuinflater inflater = getmenuinflater();         inflater.inflate(r.menu.menu, menu);         return true;     }

otherwise may in different folder, if menu.xml file in layout folder (ie 'res/layout/menu.xml', try:

public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.          menuinflater inflater = getmenuinflater();         inflater.inflate(r.layout.menu, menu);         return true;     }

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