Check if synchronization enable

app/src/main/java/eu/faircode/email/AdapterFolder.java

@@ -232,10 +232,14 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
             if (folder.tbd != null)
                 return false;
 
+            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+            boolean enabled = prefs.getBoolean("enabled", true);
+
             PopupMenu popupMenu = new PopupMenu(context, itemView);
 
             popupMenu.getMenu().add(Menu.NONE, action_synchronize_now, 1, R.string.title_synchronize_now)
-                    .setEnabled(folder.account != null || "connected".equals(folder.state) /* outbox */);
+                    .setEnabled(enabled &&
+                            (folder.account != null || "connected".equals(folder.state) /* outbox */));
 
             if (folder.account != null)
                 popupMenu.getMenu().add(Menu.NONE, action_delete_local, 2, R.string.title_delete_local);

app/src/main/java/eu/faircode/email/FragmentCompose.java

@@ -2092,6 +2092,10 @@ public class FragmentCompose extends FragmentBase {
                         if (!attachment.available)
                             throw new IllegalArgumentException(context.getString(R.string.title_attachments_missing));
 
+                    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+                    if (!prefs.getBoolean("enabled", true))
+                        throw new IllegalArgumentException(context.getString(R.string.title_sync_disabled));
+
                     // Delete draft (cannot move to outbox)
                     EntityOperation.queue(context, db, draft, EntityOperation.DELETE);
 

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -491,6 +491,10 @@ public class FragmentMessages extends FragmentBase {
             protected Boolean onExecute(Context context, Bundle args) {
                 long fid = args.getLong("folder");
 
+                SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+                if (!prefs.getBoolean("enabled", true))
+                    throw new IllegalArgumentException(context.getString(R.string.title_sync_disabled));
+
                 DB db = DB.getInstance(context);
                 try {
                     db.beginTransaction();
@@ -538,7 +542,12 @@ public class FragmentMessages extends FragmentBase {
 
             @Override
             protected void onException(Bundle args, Throwable ex) {
-                Helper.unexpectedError(getContext(), getViewLifecycleOwner(), ex);
+                swipeRefresh.setRefreshing(false);
+
+                if (ex instanceof IllegalArgumentException)
+                    Snackbar.make(view, ex.getMessage(), Snackbar.LENGTH_LONG).show();
+                else
+                    Helper.unexpectedError(getContext(), getViewLifecycleOwner(), ex);
             }
         }.execute(FragmentMessages.this, args, "messages:refresh");
     }

app/src/main/res/values/strings.xml

@@ -253,6 +253,7 @@
     <string name="title_no_move">This provider does not support MOVE</string>
     <string name="title_no_uidplus">This provider does not support UIDPLUS</string>
     <string name="title_no_sync">Synchronization errors since %1$s</string>
+    <string name="title_sync_disabled">Synchronization is disabled</string>
     <string name="title_drafts_required">A drafts folder is required to send messages</string>
     <string name="title_account_delete">Delete this account permanently?</string>
     <string name="title_identity_delete">Delete this identity permanently?</string>