java - Menu Item To New Activity -


i'm trying send user new activity using menu button, , again. put context, have basic calculator runs when app opened (works perfect right now), want user hit menu button on his/her phone, (two buttons should pop home , tip calculator) when user hits tip calculator should load new activity tipcalculator. if menu button pressed again, same 2 options should appear , home button should bring them basic calculator.

this code calculator.java

    @override     public boolean oncreateoptionsmenu(menu menu) {         super.oncreateoptionsmenu(menu);         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.activity_calculator, menu);          menu.add(menu.none,home_menu_id,menu.none,"home");         menu.add(menu.none,second_menu_id,menu.none,"tip calculator");         return true;     }      @override     public boolean onoptionsitemselected(menuitem item) {         // todo auto-generated method stub          switch(item.getitemid()){          case home_menu_id:             intent main = new intent(this,calculator.class);             startactivity(main);             finish();         return true;          case second_menu_id:             intent second = new intent(this,tipcalculator.class);             startactivity(second);             finish();         return true;          }          return super.onoptionsitemselected(item);     }

this code tipcalculator.java

    public class tipcalculator extends calculator{  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_tipcalculator); }  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.activity_tipcalculator, menu);     return true; }  @override public boolean onoptionsitemselected(menuitem item) {     // todo auto-generated method stub     intent main = new intent(this,calculator.class);     startactivity(main);     finish();     return super.onoptionsitemselected(item); }  }

the menu comes fine, , home button refresh home page, tip calculator button gives me force close error , crashes on me.


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