Populate accessibility root node info of keyboard

Partially reverting Ie033d21ef8 to populate root node info.

This CL also fixes the bounds in screen of virtual node info.

Bug: 15746768
Bug: 15582251
Change-Id: I3a82f904270adf138036ef462fd70b349a3cd33e

java/src/com/android/inputmethod/accessibility/KeyboardAccessibilityNodeProvider.java

@@ -76,7 +76,6 @@ final class KeyboardAccessibilityNodeProvider extends AccessibilityNodeProviderC
         mKeyCodeDescriptionMapper = KeyCodeDescriptionMapper.getInstance();
         mAccessibilityUtils = AccessibilityUtils.getInstance();
         mKeyboardView = keyboardView;
-        updateParentLocation();
 
         // Since this class is constructed lazily, we might not get a subsequent
         // call to setKeyboard() and therefore need to call it now.
@@ -169,10 +168,23 @@ final class KeyboardAccessibilityNodeProvider extends AccessibilityNodeProviderC
         }
         if (virtualViewId == View.NO_ID) {
             // We are requested to create an AccessibilityNodeInfo describing
-            // this View. Returning an empty info is sufficient for a keyboard.
+            // this View, i.e. the root of the virtual sub-tree.
             final AccessibilityNodeInfoCompat rootInfo =
                     AccessibilityNodeInfoCompat.obtain(mKeyboardView);
             ViewCompat.onInitializeAccessibilityNodeInfo(mKeyboardView, rootInfo);
+            updateParentLocation();
+
+            // Add the virtual children of the root View.
+            final List<Key> sortedKeys = mKeyboard.getSortedKeys();
+            final int size = sortedKeys.size();
+            for (int index = 0; index < size; index++) {
+                final Key key = sortedKeys.get(index);
+                if (key.isSpacer()) {
+                    continue;
+                }
+                // Use an index of the sorted keys list as a virtual view id.
+                rootInfo.addChild(mKeyboardView, index);
+            }
             return rootInfo;
         }
 
@@ -200,9 +212,9 @@ final class KeyboardAccessibilityNodeProvider extends AccessibilityNodeProviderC
         info.setBoundsInScreen(boundsInScreen);
         info.setParent(mKeyboardView);
         info.setSource(mKeyboardView, virtualViewId);
-        info.setBoundsInScreen(boundsInScreen);
-        info.setEnabled(true);
+        info.setEnabled(key.isEnabled());
         info.setVisibleToUser(true);
+        // TODO: Add ACTION_CLICK and ACTION_LONG_CLICK.
 
         if (mAccessibilityFocusedView == virtualViewId) {
             info.addAction(AccessibilityNodeInfoCompat.ACTION_CLEAR_ACCESSIBILITY_FOCUS);

java/src/com/android/inputmethod/keyboard/emoji/EmojiPageKeyboardView.java

@@ -21,6 +21,7 @@ import android.os.Handler;
 import android.util.AttributeSet;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
+import android.view.accessibility.AccessibilityEvent;
 
 import com.android.inputmethod.accessibility.AccessibilityUtils;
 import com.android.inputmethod.accessibility.KeyboardAccessibilityDelegate;
@@ -106,6 +107,12 @@ final class EmojiPageKeyboardView extends KeyboardView implements
         }
     }
 
+    @Override
+    public boolean dispatchPopulateAccessibilityEvent(final AccessibilityEvent event) {
+        // Don't populate accessibility event with all Emoji keys.
+        return true;
+    }
+
     /**
      * {@inheritDoc}
      */