Added option to hide all read unified folders

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

@@ -90,6 +90,7 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
     private boolean show_flagged;
     private boolean subscribed_only;
     private boolean sort_unread_atop;
+    private boolean folder_hide_read;
     private IFolderSelectedListener listener;
 
     private Context context;
@@ -1194,6 +1195,7 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
         this.subscriptions = prefs.getBoolean("subscriptions", false);
         this.subscribed_only = prefs.getBoolean("subscribed_only", false) && subscriptions;
         this.sort_unread_atop = prefs.getBoolean("sort_unread_atop", false);
+        this.folder_hide_read = prefs.getBoolean("folder_hide_read", false);
 
         this.dp3 = Helper.dp2pixels(context, 3);
         this.dp12 = Helper.dp2pixels(context, 12);
@@ -1252,27 +1254,45 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
         }
     }
 
+    void setHideRead(boolean folder_hide_read) {
+        if (this.folder_hide_read != folder_hide_read) {
+            this.folder_hide_read = folder_hide_read;
+            set(all);
+        }
+    }
+
     void setDisabled(List<Long> ids) {
         disabledIds = ids;
     }
 
     public void set(@NonNull List<TupleFolderEx> folders) {
-        Log.i("Set folders=" + folders.size() + " search=" + search);
+        Log.i("Set folders=" + folders.size() + " search=" + search +
+                " atop=" + sort_unread_atop + " hide=" + folder_hide_read);
         all = folders;
 
         List<TupleFolderEx> hierarchical;
         if (account < 0 && !primary) {
-            if (folders.size() > 0)
-                Collections.sort(folders, folders.get(0).getComparator(context));
-            hierarchical = folders;
+            List<TupleFolderEx> selected;
+            if (folder_hide_read) {
+                selected = new ArrayList<>();
+                for (TupleFolderEx folder : folders)
+                    if (folder.unseen > 0)
+                        selected.add(folder);
+            } else
+                selected = folders;
+
+            if (selected.size() > 0)
+                Collections.sort(selected, folders.get(0).getComparator(context));
 
             if (sort_unread_atop)
-                Collections.sort(hierarchical, new Comparator<TupleFolderEx>() {
+                Collections.sort(selected, new Comparator<TupleFolderEx>() {
                     @Override
                     public int compare(TupleFolderEx f1, TupleFolderEx f2) {
                         return -Boolean.compare(f1.unseen > 0, f2.unseen > 0);
                     }
                 });
+
+            hierarchical = selected;
         } else {
             List<TupleFolderEx> parents = new ArrayList<>();
             Map<Long, TupleFolderEx> idFolder = new HashMap<>();

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

@@ -663,6 +663,7 @@ public class FragmentFolders extends FragmentBase {
         boolean subscriptions = prefs.getBoolean("subscriptions", false);
         boolean subscribed_only = prefs.getBoolean("subscribed_only", false);
         boolean sort_unread_atop = prefs.getBoolean("sort_unread_atop", false);
+        boolean folder_hide_read = prefs.getBoolean("folder_hide_read", false);
 
         menu.findItem(R.id.menu_unified).setVisible(account < 0 || primary);
         menu.findItem(R.id.menu_compact).setChecked(compact);
@@ -672,6 +673,9 @@ public class FragmentFolders extends FragmentBase {
         menu.findItem(R.id.menu_subscribed_only).setChecked(subscribed_only);
         menu.findItem(R.id.menu_subscribed_only).setVisible(subscriptions);
         menu.findItem(R.id.menu_sort_unread_atop).setChecked(sort_unread_atop);
+        menu.findItem(R.id.menu_hide_read)
+                .setChecked(folder_hide_read)
+                .setVisible(account < 0 && !primary);
         menu.findItem(R.id.menu_apply_all).setVisible(account >= 0 && imap);
         menu.findItem(R.id.menu_edit_account_name).setVisible(account >= 0);
 
@@ -705,6 +709,9 @@ public class FragmentFolders extends FragmentBase {
         } else if (itemId == R.id.menu_sort_unread_atop) {
             onMenuSortUnreadAtop();
             return true;
+        } else if (itemId == R.id.menu_hide_read) {
+            onMenuHideRead();
+            return true;
         } else if (itemId == R.id.menu_search_folder) {
             onMenuSearchFolder(item);
             return true;
@@ -809,6 +816,14 @@ public class FragmentFolders extends FragmentBase {
         adapter.setSortUnreadAtop(sort_unread_atop);
     }
 
+    private void onMenuHideRead() {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
+        boolean folder_hide_read = !prefs.getBoolean("folder_hide_read", false);
+        prefs.edit().putBoolean("folder_hide_read", folder_hide_read).apply();
+        invalidateOptionsMenu();
+        adapter.setHideRead(folder_hide_read);
+    }
+
     private void onMenuSearchFolder(MenuItem item) {
         if (item.isActionViewExpanded())
             item.collapseActionView();

app/src/main/res/menu/menu_folders.xml

@@ -53,6 +53,12 @@
             android:checkable="true"
             android:title="@string/title_sort_unread_atop"
             app:showAsAction="never" />
+
+        <item
+            android:id="@+id/menu_hide_read"
+            android:checkable="true"
+            android:title="@string/title_hide_read"
+            app:showAsAction="never" />
     </group>
 
     <group android:id="@+id/group_operations">

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

@@ -1060,6 +1060,7 @@
     <string name="title_show_flagged">Show starred message count</string>
     <string name="title_subscribed_only">Subscribed only</string>
     <string name="title_sort_unread_atop">Sort unread on top</string>
+    <string name="title_hide_read">Hide all read</string>
     <string name="title_search_folder">Search for folder</string>
     <string name="title_apply_to_all">Apply to all</string>
     <string name="title_edit_account_name">Edit account name</string>