Accessibility can enhance the usability for all users, including those with low vision, blindness, hearing impairments, cognitive impairments, motor impairments or situational disabilities (such as a broken arm).
In addition to soft input methods (such as on-screen keyboards), Android supports physical keyboards attached to the device. A keyboard offers not only a convenient mode for text input, but also offers a way for users to navigate and interact with your app.
When a user navigates your app using the keyboard Tab key, the system passes input focus between elements based on the order in which they appear in the layout.
First to get focus on the needed elements set android:focusable=”true”. For element in the toolbar I was unable to get focus using keyboard tab. Then as a work around got the focus by setting android:focusableInTouchMode=”true”.
If the system does not pass focus to the appropriate view when navigating in a given direction, specify which view should receive focus with the following attributes: