Added option to disable previous/next navigation

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

@@ -815,12 +815,13 @@ public class FragmentMessages extends FragmentEx {
 
         if (viewType == AdapterMessage.ViewType.THREAD) {
             // Navigation
+            boolean nav = prefs.getBoolean("navigation", true);
             ViewModelMessages model = ViewModelProviders.of(getActivity()).get(ViewModelMessages.class);
             ViewModelMessages.Target[] pn = model.getPrevNext(thread);
             bottom_navigation.setTag(pn);
             bottom_navigation.getMenu().findItem(R.id.action_prev).setEnabled(pn[0] != null);
             bottom_navigation.getMenu().findItem(R.id.action_next).setEnabled(pn[1] != null);
-            bottom_navigation.setVisibility(pn[0] == null && pn[1] == null ? View.GONE : View.VISIBLE);
+            bottom_navigation.setVisibility(!nav || (pn[0] == null && pn[1] == null) ? View.GONE : View.VISIBLE);
         } else {
             // Compose FAB
             Bundle args = new Bundle();

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

@@ -38,6 +38,7 @@ public class FragmentOptions extends FragmentEx {
     private SwitchCompat swBrowse;
     private SwitchCompat swSwipe;
     private SwitchCompat swCompact;
+    private SwitchCompat swNav;
     private SwitchCompat swInsecure;
     private SwitchCompat swDebug;
 
@@ -55,6 +56,7 @@ public class FragmentOptions extends FragmentEx {
         swBrowse = view.findViewById(R.id.swBrowse);
         swSwipe = view.findViewById(R.id.swSwipe);
         swCompact = view.findViewById(R.id.swCompact);
+        swNav = view.findViewById(R.id.swNav);
         swInsecure = view.findViewById(R.id.swInsecure);
         swDebug = view.findViewById(R.id.swDebug);
 
@@ -114,6 +116,14 @@ public class FragmentOptions extends FragmentEx {
             }
         });
 
+        swNav.setChecked(prefs.getBoolean("navigation", true));
+        swNav.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("navigation", checked).apply();
+            }
+        });
+
         swInsecure.setChecked(prefs.getBoolean("insecure", false));
         swInsecure.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override

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

@@ -109,6 +109,7 @@ public class FragmentSetup extends FragmentEx {
             "browse",
             "swipe",
             "compat",
+            "navigation",
             "insecure",
             "sort"
     );

app/src/main/res/layout/fragment_messages.xml

@@ -167,7 +167,7 @@
         <com.google.android.material.bottomnavigation.BottomNavigationView
             android:id="@+id/bottom_navigation"
             android:layout_width="match_parent"
-            android:layout_height="28dp"
+            android:layout_height="wrap_content"
             android:background="?attr/colorSeparator"
             app:itemIconTint="@color/bottomnav_background"
             app:itemTextColor="@color/bottomnav_background"

app/src/main/res/layout/fragment_options.xml

@@ -65,6 +65,15 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/swSwipe" />
 
+        <androidx.appcompat.widget.SwitchCompat
+            android:id="@+id/swNav"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/title_advanced_nav"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/swCompact" />
+
         <androidx.appcompat.widget.SwitchCompat
             android:id="@+id/swInsecure"
             android:layout_width="match_parent"
@@ -72,7 +81,7 @@
             android:layout_marginTop="12dp"
             android:text="@string/title_allow_insecure"
             app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/swCompact" />
+            app:layout_constraintTop_toBottomOf="@id/swNav" />
 
         <androidx.appcompat.widget.SwitchCompat
             android:id="@+id/swDebug"

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

@@ -86,6 +86,7 @@
     <string name="title_advanced_browse">Browse messages on the server</string>
     <string name="title_advanced_swipe">Swipe actions</string>
     <string name="title_advanced_compact">Compact message view</string>
+    <string name="title_advanced_nav">Previous/next navigation</string>
     <string name="title_advanced_debug">Debug mode</string>
 
     <string name="title_select">Select &#8230;</string>