Show options menu & navigation drawer using WebView

AnkiDroid/src/main/assets/scripts/card.js

@@ -93,6 +93,15 @@ function buttonAnswerEase3() {
 function buttonAnswerEase4() {
     window.location.href = "signal:answer_ease4";
 }
+// Show options menu
+function ankiShowOptionsMenu() {
+    window.location.href = "signal:anki_show_options_menu";
+}
+
+// Show Navigation Drawer
+function ankiShowNavDrawer() {
+    window.location.href = "signal:anki_show_navigation_drawer";
+}
 
 /* Reload card.html */
 function reloadPage() {

AnkiDroid/src/main/java/com/ichi2/anki/AbstractFlashcardViewer.java

@@ -185,6 +185,8 @@ public abstract class AbstractFlashcardViewer extends NavigationDrawerActivity i
     // ETA
     private int eta;
 
+    private boolean isInFullscreen;
+
     /**
      * Broadcast that informs us when the sd card is about to be unmounted
      */
@@ -3080,6 +3082,28 @@ private boolean filterUrl(String url) {
                 mFlipCardLayout.performClick();
                 return true;
             }
+            // Show options menu from WebView
+            if (url.startsWith("signal:anki_show_options_menu")) {
+                isInFullscreen = !getSupportActionBar().isShowing();
+                if (isInFullscreen) {
+                    openOptionsMenu();
+                } else {
+                    UIUtils.showThemedToast(AbstractFlashcardViewer.this, getString(R.string.ankidroid_turn_on_fullscreen_options_menu), true);
+                }
+                return true;
+            }
+
+            // Show Navigation Drawer from WebView
+            if (url.startsWith("signal:anki_show_navigation_drawer")) {
+                isInFullscreen = !getSupportActionBar().isShowing();
+                if (isInFullscreen) {
+                    AbstractFlashcardViewer.this.onNavigationPressed();
+                } else {
+                    UIUtils.showThemedToast(AbstractFlashcardViewer.this, getString(R.string.ankidroid_turn_on_fullscreen_nav_drawer), true);
+                }
+                return true;
+            }
+
             // card.html reload
             if (url.startsWith("signal:reload_card_html")) {
                 redrawCard();

AnkiDroid/src/main/res/values/02-strings.xml

@@ -261,4 +261,8 @@
     <string name="restore_default">Restore Default</string>
 
     <string name="reviewer_tts_cloze_spoken_replacement">Blank</string>
+
+    <!-- in options menu & Navigation Drawer -->
+    <string name="ankidroid_turn_on_fullscreen_nav_drawer">Please turn on fullscreen to use Show Navigation Drawer using JavaScript.</string>
+    <string name="ankidroid_turn_on_fullscreen_options_menu">Please turn on fullscreen to use Show Options Menu using JavaScript.</string>
 </resources>