Making onscreen targets easy to touch is an important aspect of minimizing driver distraction.
Guidance at a glance (TL;DR):
- Minimum touch-target size is 76 x 76dp
- Enclose icons within touch targets and center them
Aligning icons and touch targets
Touch targets must be larger on car interfaces so they are easier to glance at and tap. Android Auto uses a minimum touch-target size of 76 x 76dp. Considerations in determining this touch-target size include the driver's distance from the head unit and the need for generously sized touch targets to accommodate quick taps while driving.
Touch targets cannot overlap. All elements of a touch target must appear on the same z-layer as clearly delineated action areas so they can be logically focused with a rotary input.