Bottom bar
- In general, key action buttons are provided in the app bar. However, action buttons can also be placed at the bottom of the screen. This is especially useful for edit, move, and delete buttons available after the user has selected something on the screen.
- In some cases, these buttons will disappear when the user scrolls down in order to allow for more immersion. Scrolling up will make them reappear.
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Bottom navigation
Material design
- The bottom of the screen can hold a maximum of 5 action buttons. These buttons should include both icons and text so they're easy to understand. If more buttons are needed, the four most-used action buttons can be displayed and the rest should go in a More options menu on the far right side of the bottom bar.
Multi selection mode : Users can choose one of the actions provided at the bottom toolbar.
The bottom toolbar can’t display only one action button.