How to make this drop-down menu in the upper right corner. Does anyone have lessons on this topic?

in place toast.maketext (feedatory.this, "hello", toast.length_long) .show (); , I want to realize what, wrote @katso

@ override
Public Boolean OnoPtionSetemSelected (MenuItem Item) {
  int id = item.getitemid ();
  Switch (ID) {
    Case android.r.id.home:
      mdrawerlayout.opendrawer (gravitycompat.start);
      RETURN TRUE;
    Case R.ID.Menu_Filter:
      Toast.maketext (FeedActivity.this, "Hello", toast.length_long) .show ();
      RETURN TRUE;
  }
  RETURN SUPER.ONOPTIONSIEMSELECTED (Item);
}

Answer 1, Authority 100%

popup_menu.xml

& lt; menu xmlns: android = "http://schemas.android.com/apk/res/android" & gt;
  & lt; item
    Android: id = "@ + id / one"
    Android: title = "One" / & gt;
  & lt; item
    Android: id = "@ + id / two"
    Android: title = "two" / & gt;
  & lt; item
    Android: id = "@ + id / three"
    Android: title = "three" / & gt;
& lt; / menu & gt;

button button = (button) findviewbyid (r.id.button);
Button.SetonClicklistener (new onclicklistener () {
  @Override
  Public Void OnClick (View V) {
    PopupMenu Popup = New PopupMenu (MainActivity.this, Button);
    popup.getmenuinflater (). Inflate (R.Menu.popup_Menu, popup.getMenu ());
    popup.setonmenuitemclicklistener (new popupmenu.onmenuitemclicklistener () {
      Public Boolean OnMenuitemClick (MenuItem Item) {
        Toast.maketext (MainActivity.this, "You Clicked:" + Item.Gettitle (), toast.length_short) .show ();
        RETURN TRUE;
      }
    });
    popup.show ();
  }
});