Unchecking 'Silence the phone when connected' was not returning my phone to 'vibrate mode' correctly, this change saves the state of the ringer regardless of its status during connection, allowing to correctly set it back when 'silence the phone' is unchecked.

Author: alexmex90

app/src/main/java/org/asteroidos/sync/connectivity/SilentModeService.java

@@ -44,10 +44,11 @@ public final void sync() {
         if (notificationPref == null) {
             notificationPref = prefs.getBoolean(PREF_RINGER, false);
 
+            SharedPreferences.Editor editor = prefs.edit();
+            editor.putInt(PREF_ORIG_RINGER, am.getRingerMode());
+            editor.apply();
+
             if (notificationPref) {
-                SharedPreferences.Editor editor = prefs.edit();
-                editor.putInt(PREF_ORIG_RINGER, am.getRingerMode());
-                editor.apply();
                 am.setRingerMode(AudioManager.RINGER_MODE_SILENT);
             }
         }