Chapter 19 Accessibility
You will notice something different right away. A green outline appears around the Up button
(Figure 19.3) and the device speaks: “Navigate Up button. Double-tap to activate.”
Figure 19.3 TalkBack enabled
(Although “press” is the usual terminology for Android devices, TalkBack uses “tap.” Also, TalkBack
uses double-taps, which are not commonly used in Android.)
The green outline indicates which UI element has accessibility focus. Only one UI element can have
accessibility focus at a time. When a UI element receives focus, TalkBack will provide information
about that element.
When TalkBack is enabled, a single press (or “tap”) gives an element accessibility focus. Double-
tapping anywhere on the screen activates the element. So double-tapping when the Up button has focus
navigates up, double-tapping when a checkbox has focus toggles its check state, etc. (Also, if your
device locks, you can unlock it by pressing the lock icon and then double-tapping anywhere on the
screen.)