[iitcm] tweaks to fullscreen menu item

Use other icon for returning from fullscreen if shown as action. If shown in the action overflow, provide a chechbox to show current state.

mobile/res/menu/main.xml

@@ -22,6 +22,7 @@
         android:title="@string/menu_layer_chooser"/>
     <item
         android:id="@+id/toggle_fullscreen"
+        android:checkable="true"
         android:icon="@drawable/ic_action_full_screen"
         android:orderInCategory="110"
         android:showAsAction="ifRoom"

mobile/res/values/strings.xml

@@ -205,7 +205,7 @@
     </string-array>
 
     <string name="menu_reload">Reload IITC</string>
-    <string name="menu_toggle_fullscreen">Toggle fullscreen</string>
+    <string name="menu_toggle_fullscreen">Fullscreen</string>
     <string name="menu_layer_chooser">Layer Chooser</string>
     <string name="menu_locate">Get Location</string>
     <string name="menu_clear_cookies">Clear Cookies</string>

mobile/src/com/cradle/iitc_mobile/IITC_Mobile.java

@@ -535,6 +535,13 @@ public class IITC_Mobile extends Activity
                     item.setVisible(true);
                     break;
 
+                case R.id.toggle_fullscreen:
+                    item.setChecked(mIitcWebView.isInFullscreen());
+                    item.setIcon(mIitcWebView.isInFullscreen()
+                            ? R.drawable.ic_action_return_from_full_screen
+                            : R.drawable.ic_action_full_screen);
+                    break;
+
                 case R.id.locate:
                     item.setVisible(enabled && visible);
                     item.setEnabled(!mIsLoading);

mobile/src/com/cradle/iitc_mobile/IITC_WebView.java

@@ -221,6 +221,7 @@ public class IITC_WebView extends WebView {
             loadUrl("javascript: $('#updatestatus').show();");
         }
         mIitc.getWindow().setAttributes(attrs);
+        mIitc.invalidateOptionsMenu();
     }
 
     void updateFullscreenStatus() {