Fix for bootstrap submenus on android devices. Clicking to open the submenu, would actually close the whole menu. This one line fix worked for me (forked from https://github.com/twitter/bootstrap/commit/37d0a30589e8bd74299b2d857c348d91396563ed). Dropdowns on iOS seem to work without needing any fix.

gistfile1.diff

diff --git a/js/bootstrap-dropdown.js b/js/bootstrap-dropdown.js
index a1d5151..3a59467 100644
--- a/js/bootstrap-dropdown.js
+++ b/js/bootstrap-dropdown.js
@@ -49,7 +49,7 @@

       isActive = $parent.hasClass('open')

-      clearMenus()
+      if (! $parent.hasClass('dropdown-submenu')) clearMenus()

       if (!isActive) {
         $parent.toggleClass('open')