+ boolean isFabOpen = isFabOpen();
+ boolean isDrawerOpen = isDrawerOpen();
+
+ /*
+ * BackPressed priority/hierarchy:
+ * 1. close drawer if opened
+ * 2. close FAB if open (only if drawer isn't open)
+ * 3. navigate up (only if drawer and FAB aren't open)
+ */
+ if(isDrawerOpen && isFabOpen) {
+ // close drawer first
+ super.onBackPressed();
+ } else if(isDrawerOpen && !isFabOpen) {
+ // close drawer
+ super.onBackPressed();
+ } else if (!isDrawerOpen && isFabOpen) {
+ // close fab
+ getListOfFilesFragment().getFabMain().collapse();
+ } else {
+ // all closed