While reading about lists in material design, I could not understand what Primary and Secondary actions refer to for checkboxes. I could not find any information about it. What is the difference between them, especially for check boxes? Please suggest a few examples.
Image 1 is about secondary actions and 2 is about primary actions.
The text of that section is short but pretty straight-forward:
- Secondary action
This checkbox is the list item’s secondary action.- Primary action
This checkbox is both the list item’s primary action and state indicator.
In the case of a secondary section, the checkbox is a simple selection while the list item can present other information as well (e.g. the images in your example). In a primary case, the main purpose of the list item is to be selected.
Basically it's about wether to place the selection element in a dominant or a less obtrusive position.
