Navigation from accounts/folders to unified inbox

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

@@ -297,6 +297,7 @@ public class FragmentAccounts extends FragmentBase {
     @Override
     public void onPrepareOptionsMenu(Menu menu) {
         menu.findItem(R.id.menu_search).setVisible(!settings);
+        menu.findItem(R.id.menu_unified).setVisible(!settings);
 
         super.onPrepareOptionsMenu(menu);
     }
@@ -307,6 +308,9 @@ public class FragmentAccounts extends FragmentBase {
             case R.id.menu_search:
                 onMenuSearch();
                 return true;
+            case R.id.menu_unified:
+                onMenuUnified();
+                return true;
             case R.id.menu_force_sync:
                 onMenuForceSync();
                 return true;
@@ -323,6 +327,15 @@ public class FragmentAccounts extends FragmentBase {
         fragment.show(getParentFragmentManager(), "search");
     }
 
+    private void onMenuUnified() {
+        FragmentMessages fragment = new FragmentMessages();
+        fragment.setArguments(new Bundle());
+
+        FragmentTransaction fragmentTransaction = getParentFragmentManager().beginTransaction();
+        fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("messages");
+        fragmentTransaction.commit();
+    }
+
     private void onMenuForceSync() {
         ServiceSynchronize.reload(getContext(), null, true, "force sync");
         ToastEx.makeText(getContext(), R.string.title_executing, Toast.LENGTH_LONG).show();

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

@@ -451,6 +451,7 @@ public class FragmentFolders extends FragmentBase {
         boolean subscriptions = prefs.getBoolean("subscriptions", false);
         boolean subscribed_only = prefs.getBoolean("subscribed_only", false);
 
+        menu.findItem(R.id.menu_unified).setVisible(account < 0 && !primary);
         menu.findItem(R.id.menu_compact).setChecked(compact);
         menu.findItem(R.id.menu_show_hidden).setChecked(show_hidden);
         menu.findItem(R.id.menu_show_flagged).setChecked(show_flagged);
@@ -467,6 +468,9 @@ public class FragmentFolders extends FragmentBase {
             case R.id.menu_search:
                 onMenuSearch();
                 return true;
+            case R.id.menu_unified:
+                onMenuUnified();
+                return true;
             case R.id.menu_compact:
                 onMenuCompact();
                 return true;
@@ -499,6 +503,15 @@ public class FragmentFolders extends FragmentBase {
         fragment.show(getParentFragmentManager(), "search");
     }
 
+    private void onMenuUnified() {
+        FragmentMessages fragment = new FragmentMessages();
+        fragment.setArguments(new Bundle());
+
+        FragmentTransaction fragmentTransaction = getParentFragmentManager().beginTransaction();
+        fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("messages");
+        fragmentTransaction.commit();
+    }
+
     private void onMenuCompact() {
         compact = !compact;
 

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

@@ -8,6 +8,12 @@
         android:title="@string/title_search"
         app:showAsAction="always" />
 
+    <item
+        android:id="@+id/menu_unified"
+        android:icon="@drawable/twotone_all_inbox_24"
+        android:title="@string/title_folders_unified"
+        app:showAsAction="always" />
+
     <item
         android:id="@+id/menu_force_sync"
         android:title="@string/title_force_sync"

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

@@ -8,6 +8,12 @@
         android:title="@string/title_search"
         app:showAsAction="always" />
 
+    <item
+        android:id="@+id/menu_unified"
+        android:icon="@drawable/twotone_all_inbox_24"
+        android:title="@string/title_folders_unified"
+        app:showAsAction="always" />
+
     <item
         android:id="@+id/menu_compact"
         android:checkable="true"