Add support for NEXT_HTML_ELEMENT to WebViewClassic.

Bug: 6663344
Change-Id: Ieb48998e3af12916fe499a12d5bf7a767df8d05b

Author: alanv

core/java/android/webkit/AccessibilityInjector.java

@@ -488,15 +488,19 @@ private boolean sendActionToAndroidVox(int action, Bundle arguments) {
             switch (action) {
                 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY:
                 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY:
-                    final int granularity = arguments.getInt(
-                            AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT);
-                    mAccessibilityJSONObject.accumulate("granularity", granularity);
+                    if (arguments != null) {
+                        final int granularity = arguments.getInt(
+                                AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT);
+                        mAccessibilityJSONObject.accumulate("granularity", granularity);
+                    }
                     break;
                 case AccessibilityNodeInfo.ACTION_NEXT_HTML_ELEMENT:
                 case AccessibilityNodeInfo.ACTION_PREVIOUS_HTML_ELEMENT:
-                    final String element = arguments.getString(
-                            AccessibilityNodeInfo.ACTION_ARGUMENT_HTML_ELEMENT_STRING);
-                    mAccessibilityJSONObject.accumulate("element", element);
+                    if (arguments != null) {
+                        final String element = arguments.getString(
+                                AccessibilityNodeInfo.ACTION_ARGUMENT_HTML_ELEMENT_STRING);
+                        mAccessibilityJSONObject.accumulate("element", element);
+                    }
                     break;
             }
         } catch (JSONException e) {

core/java/android/webkit/AccessibilityInjectorFallback.java

@@ -272,11 +272,19 @@ private boolean traverseCurrentAxis(int direction, boolean sendEvent,
     boolean performAccessibilityAction(int action, Bundle arguments) {
         switch (action) {
             case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY:
-            case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY:
+            case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: {
                 final int direction = getDirectionForAction(action);
                 final int axis = getAxisForGranularity(arguments.getInt(
                         AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT));
                 return traverseGivenAxis(direction, axis, true, null);
+            }
+            case AccessibilityNodeInfo.ACTION_NEXT_HTML_ELEMENT:
+            case AccessibilityNodeInfo.ACTION_PREVIOUS_HTML_ELEMENT: {
+                final int direction = getDirectionForAction(action);
+                // TODO: Add support for moving by object.
+                final int axis = NAVIGATION_AXIS_SENTENCE;
+                return traverseGivenAxis(direction, axis, true, null);
+            }
             default:
                 return false;
         }
@@ -291,8 +299,10 @@ boolean performAccessibilityAction(int action, Bundle arguments) {
      */
     private static int getDirectionForAction(int action) {
         switch (action) {
+            case AccessibilityNodeInfo.ACTION_NEXT_HTML_ELEMENT:
             case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY:
                 return NAVIGATION_DIRECTION_FORWARD;
+            case AccessibilityNodeInfo.ACTION_PREVIOUS_HTML_ELEMENT:
             case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY:
                 return NAVIGATION_DIRECTION_BACKWARD;
             default:
@@ -316,8 +326,8 @@ private static int getAxisForGranularity(int granularity) {
             case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_LINE:
                 return NAVIGATION_AXIS_SENTENCE;
             case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH:
-                // TODO: Figure out what nextSibling() actually means.
-                return NAVIGATION_AXIS_SIBLING;
+                // TODO: This should map to object once we implement it.
+                return NAVIGATION_AXIS_SENTENCE;
             case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PAGE:
                 return NAVIGATION_AXIS_DOCUMENT;
             default: