onInit
var yourhardcodeddata=[{key:1,value:1}];
var yourjsonmodel=new JSONModel({"dd":yourhardcodeddata});
this.setModel(yourjsonmodel,"ViewModel");
in your view
<comm:DropdownBox tooltip="Year"
selectedKey="{whereveryouwanttostoretheselection}" items="{path: '/dd',model:'ViewModel'}">
<core:ListItem key="{ViewModel>key}" text="{ViewModel>value}"></core:ListItem>
</comm:DropdownBox>