A pity no-one replied.
Anyway, I decided to get rid of the sub-menu and on item selection, open a
new context menu. Only issue was to actually keep it open, and I had to
delay the opening of the sub-menu.
The following got rid of the flickering and ensured the sub-menu remained
open. Had to use a spare hidden view to open the new context menu though.
if (id == R.id.menu_item_for_sub_menu)
{
new Handler().postDelayed(new Runnable()
{
@Override
public void run()
{
View v = vg.findViewById(R.id.fake_view_for_context);
if (v != null)
{
registerForContextMenu(v);
openContextMenu(v);
unregisterForContextMenu(v);
}
}
}, 0);
}
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