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Determine if an accessibility service is running

• Check if TalkBack (or other spoken feedback accessibility service) is enabled
• Reports as enabled even if TalkBack is suspended

AccessibilityServices services = AccessibilityServices.newInstance(context);
services.isSpokenFeedbackEnabled();

There's other methods also:

• isClosedCaptioningEnabled()
• isSwitchAccessEnabled()

Usage hints

Usage hints are read aloud by TalkBack (and made available to other accessibility services). On TalkBack, they're read aloud after the content description for a view. For example, "Log in button... Double tap to activate", where "Double tap to activate" is the usage hint.

These can be customized on Lollipop and above:

UsageHintsAccessibilityDelegate usageHintsDelegate = new UsageHintsAccessibilityDelegate(getResources())
usageHintsDelegate.setClickLabel("sign in");
ViewCompat.setAccessibilityDelegate(logInButton, usageHintsDelegate);

so now it'll say, "Log in button... Double tap to sign in".

Custom accessibility actions

• a wrapper around View actions to facilitate actions via dialog or TalkBack local gestures menu

First create Actions. It's necessary to give each Action a unique resource ID (required by AccessibilityActionCompat see ActionsAccessibilityDelegate), and a display label.

Actions actions = // ...
AccessibilityDelegateCompat delegate = new ActionsAccessibilityDelegate(getResources(), actions);
ViewCompat.setAccessibilityDelegate(this, delegate);

// ...

// if TalkBack is enabled, display dialog on click
private void showAlertDialogFor(Actions actions) {
    new ActionsAlertDialogCreator(getContext(), R.string.tweet_actions_title, actions)
            .create()
            .show();
}