Accessiblity focus not following input focus and text nav broken.

1. View is checking if the accessibility focus is its
   descendant it clears the accessibility focus state
   in ViewRootImpl. The check in View was missing the
   case that the descendant may be the view itself. In
   such a case we want the normal clearing code to run.

2. The check whether a view has iterable text for
   accessibility was inverted and text nav was not
   working.

Change-Id: I1a13b6809fb7f205fff76ca09cd449179d06e530

Author: sganov

core/java/android/view/View.java

@@ -6159,7 +6159,8 @@ public void clearAccessibilityFocus() {
         ViewRootImpl viewRootImpl = getViewRootImpl();
         if (viewRootImpl != null) {
             View focusHost = viewRootImpl.getAccessibilityFocusedHost();
-            if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) {
+            if (focusHost != null && focusHost != this
+                    && ViewRootImpl.isViewDescendantOf(focusHost, this)) {
                 viewRootImpl.setAccessibilityFocusedHost(null);
             }
         }
@@ -6637,7 +6638,7 @@ boolean performAccessibilityActionInternal(int action, Bundle arguments) {
 
     private boolean nextAtGranularity(int granularity) {
         CharSequence text = getIterableTextForAccessibility();
-        if (text != null && text.length() > 0) {
+        if (text == null || text.length() == 0) {
             return false;
         }
         TextSegmentIterator iterator = getIteratorForGranularity(granularity);
@@ -6661,7 +6662,7 @@ private boolean nextAtGranularity(int granularity) {
 
     private boolean previousAtGranularity(int granularity) {
         CharSequence text = getIterableTextForAccessibility();
-        if (text != null && text.length() > 0) {
+        if (text == null || text.length() == 0) {
             return false;
         }
         TextSegmentIterator iterator = getIteratorForGranularity(granularity);