Google have announced an accessibility helpdesk.
Can't comment on it's usefulness, but here's the link:
https://www.google.com/accessibility/
Here's a direct link to TalkBack help:
https://support.google.com/accessibility/android/answer/6007100
HTH
Glen
To post to the list, simply send email to vi-android@xxxxxxxxxxxxx.
To unsubscribe from the list send an email to vi-android-request@xxxxxxxxxxxxx
with 'unsubscribe' in the Subject field (new users, use 'subscribe' to
subscribe)
To receive the list as a digest, send an email to
vi-android-request@xxxxxxxxxxxxx with 'set vi-android digest' in the subject
(to go back to receiving every message use 'unset vi-android digest' in the
subject).