Announce when checked status changes on Android (flutter#4557)

Fixes flutter/flutter#14092
nitinreddy3 · Jan 17, 2018 · 7173a15 · 7173a15
1 parent e1e97b9
commit 7173a15
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/shell/platform/android/io/flutter/view/AccessibilityBridge.java b/shell/platform/android/io/flutter/view/AccessibilityBridge.java
@@ -403,13 +403,21 @@ void handleTouchExploration(float x, float y) {
 
     void updateSemantics(ByteBuffer buffer, String[] strings) {
         ArrayList<Integer> updated = new ArrayList<Integer>();
+        ArrayList<Integer> checkedChanged = new ArrayList<Integer>();
         while (buffer.hasRemaining()) {
             int id = buffer.getInt();
             SemanticsObject object = getOrCreateObject(id);
+            boolean hadCheckedState = object.hasFlag(Flag.HAS_CHECKED_STATE);
+            boolean wasChecked = object.hasFlag(Flag.IS_CHECKED);
             object.updateWith(buffer, strings);
             if (object.hasFlag(Flag.IS_FOCUSED)) {
                 mInputFocusedObject = object;
             }
+            if (mA11yFocusedObject != null && mA11yFocusedObject.id == id
+                    && hadCheckedState && object.hasFlag(Flag.HAS_CHECKED_STATE)
+                    && wasChecked != object.hasFlag(Flag.IS_CHECKED)) {
+                checkedChanged.add(id);
+            }
             updated.add(id);
         }
 
@@ -434,6 +442,10 @@ void updateSemantics(ByteBuffer buffer, String[] strings) {
         for (Integer id : updated) {
             sendAccessibilityEvent(id, AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
         }
+        for (Integer id : checkedChanged) {
+            // Simulate a click so TalkBack announces the change in checked state.
+            sendAccessibilityEvent(id, AccessibilityEvent.TYPE_VIEW_CLICKED);
+        }
     }
 
     private AccessibilityEvent obtainAccessibilityEvent(int virtualViewId, int eventType) {