Fix accessibility announce on apps page

Stops the workspace from announcing incorrectly while the apps
page is open, also makes the apps announce which page on opening.

Bug: 13006306
Change-Id: I723011fc55c24b66604a24b16c17bac4f5653f84
diff --git a/src/com/android/launcher3/AppsCustomizeTabHost.java b/src/com/android/launcher3/AppsCustomizeTabHost.java
index bb7f045..c6455c2 100644
--- a/src/com/android/launcher3/AppsCustomizeTabHost.java
+++ b/src/com/android/launcher3/AppsCustomizeTabHost.java
@@ -29,6 +29,7 @@
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.accessibility.AccessibilityManager;
 import android.widget.FrameLayout;
 import android.widget.LinearLayout;
 import android.widget.TabHost;
@@ -430,6 +431,14 @@
             // prevent slowing down the animation)
             mAppsCustomizePane.loadAssociatedPages(mAppsCustomizePane.getCurrentPage());
 
+            // Opening apps, need to announce what page we are on.
+            AccessibilityManager am = (AccessibilityManager)
+                    getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
+            if (am.isEnabled()) {
+                // Notify the user when the page changes
+                announceForAccessibility(mAppsCustomizePane.getCurrentPageDescription());
+            }
+
             // Going from Workspace -> All Apps
             // NOTE: We should do this at the end since we check visibility state in some of the
             // cling initialization/dismiss code above.