Update prev/next icon

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

@@ -1440,14 +1440,6 @@ public class FragmentMessages extends FragmentBase
             }
         });
 
-        if (prefs.getBoolean("updown", true)) {
-            boolean reversed = prefs.getBoolean("reversed", false);
-            bottom_navigation.getMenu().findItem(R.id.action_prev)
-                    .setIcon(reversed ? R.drawable.twotone_north_24 : R.drawable.twotone_south_24);
-            bottom_navigation.getMenu().findItem(R.id.action_next)
-                    .setIcon(reversed ? R.drawable.twotone_south_24 : R.drawable.twotone_north_24);
-        }
-
         bottom_navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
             @Override
             public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
@@ -2030,6 +2022,7 @@ public class FragmentMessages extends FragmentBase
         ibSnoozed.setVisibility(View.GONE);
         bottom_navigation.getMenu().findItem(R.id.action_prev).setEnabled(false);
         bottom_navigation.getMenu().findItem(R.id.action_next).setEnabled(false);
+        updateNavPrevNext();
         bottom_navigation.setVisibility(actionbar && viewType == AdapterMessage.ViewType.THREAD ? View.INVISIBLE : View.GONE);
         grpReady.setVisibility(View.GONE);
         pbWait.setVisibility(View.VISIBLE);
@@ -2084,6 +2077,7 @@ public class FragmentMessages extends FragmentBase
                         prev = id;
                     bottom_navigation.getMenu().findItem(R.id.action_prev).setEnabled(prev != null);
                     bottom_navigation.getMenu().findItem(R.id.action_next).setEnabled(next != null);
+                    updateNavPrevNext();
                 }
 
                 @Override
@@ -2095,6 +2089,7 @@ public class FragmentMessages extends FragmentBase
                         next = id;
                     bottom_navigation.getMenu().findItem(R.id.action_prev).setEnabled(prev != null);
                     bottom_navigation.getMenu().findItem(R.id.action_next).setEnabled(next != null);
+                    updateNavPrevNext();
                 }
 
                 @Override
@@ -7967,6 +7962,29 @@ public class FragmentMessages extends FragmentBase
         return false;
     }
 
+    private void updateNavPrevNext() {
+        MenuItem prev = bottom_navigation.getMenu().findItem(R.id.action_prev);
+        MenuItem next = bottom_navigation.getMenu().findItem(R.id.action_next);
+
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
+        if (prefs.getBoolean("updown", true)) {
+            boolean reversed = prefs.getBoolean("reversed", false);
+            prev.setIcon(prev.isEnabled()
+                    ? (reversed ? R.drawable.twotone_north_24 : R.drawable.twotone_south_24)
+                    : R.drawable.twotone_horizontal_rule_24);
+            next.setIcon(next.isEnabled()
+                    ? (reversed ? R.drawable.twotone_south_24 : R.drawable.twotone_north_24)
+                    : R.drawable.twotone_horizontal_rule_24);
+        } else {
+            prev.setIcon(prev.isEnabled()
+                    ? R.drawable.twotone_play_arrow_back_24
+                    : R.drawable.twotone_horizontal_rule_24);
+            next.setIcon(next.isEnabled()
+                    ? R.drawable.twotone_play_arrow_24
+                    : R.drawable.twotone_horizontal_rule_24);
+        }
+    }
+
     private void updateCompose() {
         if (!getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
             return;