Don't generate irrelevant a11y events - framework

Now before we fire an a11y event we check if this event has an
observer. As a bonus we don't push the state to clients if the
dynamic service config did not change.

Test: cts-tradefed run cts-dev -m CtsAccessibilityServiceTestCases

bug:69427760

Change-Id: Ie208e13b8557bb7a120198a43efcb79c2752f5db

1 files changed, 4 insertions, 0 deletions

diff --git a/core/java/android/widget/TextView.java b/core/java/android/widget/TextView.java
index d9bc51fffd6a..71532a72d7b4 100644
--- a/core/java/android/widget/TextView.java
+++ b/core/java/android/widget/TextView.java
@@ -10836,6 +10836,10 @@ public class TextView extends View implements ViewTreeObserver.OnPreDrawListener
 
     void sendAccessibilityEventTypeViewTextChanged(CharSequence beforeText,
             int fromIndex, int removedCount, int addedCount) {
+        if (!AccessibilityManager.getInstance(mContext).isObservedEventType(
+                AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED)) {
+            return;
+        }
         AccessibilityEvent event =
                 AccessibilityEvent.obtain(AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED);
         event.setFromIndex(fromIndex);