Android Talkback未自动播报选中状态问题求助

The core issue is that Talkback relies on the view's actual selected state (via the isSelected property) to automatically prepend the "selected" prefix—not just sending a TYPE_VIEW_SELECTED accessibility event. Here's how to resolve it:

1. Mark the selected view as truly selected
   Before triggering accessibility focus, ensure the target view has its isSelected property set to true, and all other BottomSheet items are set to false. This explicitly tells Talkback the view's state.

   // Example: When initializing or updating BottomSheet selection
   bottomSheetItemContainer.children.forEach { itemView ->
       itemView.isSelected = itemView == selectedView
   }
   

2. Simplify the accessibility focus logic
   Once the view's selected state is correctly set, redundant events aren't necessary. Focusing the view and sending the appropriate accessibility event will let Talkback announce the state automatically.

   Update your extension function:

   private fun View.accessibilityFocus(): View {
       this.requestFocus()
       this.performAccessibilityAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null)
       // This event will include the selected state if isSelected is true
       this.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED)
       return this
   }
   

3. Adjust the delayed call
   Keep your existing delayed invocation, but ensure the isSelected state is set before calling accessibilityFocus():

   if (isCurrentlySelectedTab) {
       // Set selected state first
       selectedView.isSelected = true
       // Optional: Unselect other items here if not handled earlier
       uiHandler.postDelayed(
           {
               selectedView.accessibilityFocus()
           },
           ACCESSIBILITY_DELAY,
       )
   }
   

This works because Talkback checks the view's isSelected flag when processing accessibility events. If the flag is true, it automatically adds the "selected" prefix to the content description without manual hardcoding.

内容的提问来源于stack exchange，提问作者Subodh Nijsure