When an Activity comes to the foreground, TalkBack announces it’s title. When the activity has no title, TalkBack announces the name of the application which might confuse the user -> set a title to all visible activities, either in AndroidManifest or using Activity.setTitle() method.
Set contentDescription attribute to all ImageViews (null is a valid value).
Illustrative images and images with labels should have contentDescription set to null -> “android:contentDescription="@null" or have importantForAccessibility set to “no” -> “android:importantForAccessibility="no".
ImageButtons with labels should have contentDescription set to null. Setting importanceForAccessibility to “no” makes them unfocusable in the accessibility mode.
When a UI element is just a label for another element, set the labelFor attribute.
If users should treat a set of elements as a single unit of information, you can group these elements in a focusable container (use android:focusable=”true”).
Make sure that custom views are accessible with both Switch Access and TalkBack. Consider implementing accessibility functionality for them using ExploreByTouchHelper.