Allows Accessibility to focus on specified view in AbstractFloatingView.

Here, the first item in an ArrowPopup or Folder are focused on.

Note: There's another pre-existing bug where it announces
"Home screen x of y" when the floating view appears; this
change doesn't address that.

Fixes: 147470419
Change-Id: I1dc70edc21ea7c19a5742208512738d6c4a94067

src/com/android/launcher3/AbstractFloatingView.java

@@ -174,7 +174,8 @@ public abstract class AbstractFloatingView extends LinearLayout implements Touch
                 targetInfo.first, TYPE_WINDOW_STATE_CHANGED, targetInfo.second);
 
         if (mIsOpen) {
-            performAccessibilityAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
+            getAccessibilityInitialFocusView().performAccessibilityAction(
+                    AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
         }
         ActivityContext.lookupContext(getContext()).getDragLayer()
                 .sendAccessibilityEvent(TYPE_WINDOW_CONTENT_CHANGED);
@@ -184,6 +185,11 @@ public abstract class AbstractFloatingView extends LinearLayout implements Touch
         return null;
     }
 
+    /** Returns the View that Accessibility services should focus on first. */
+    protected View getAccessibilityInitialFocusView() {
+        return this;
+    }
+
     /**
      * Returns a view matching FloatingViewType
      */