Snackbars
Snackbars provide brief messages about app processes through a message - typically at the bottom of the screen
Snackbars inform users of a process that an app has performed or will perform. They appear temporarily, towards the bottom of the screen. They shouldn’t interrupt the user experience, and they don’t require user input to disappear.
Snackbars contain a single line of text directly related to the operation performed. They may contain a text action, but no icons. You can use them to display notifications.
Frequency
Only one snackbar may be displayed at a time.
Simple
A basic snackbar that aims to reproduce Google Keep's snackbar behavior.
Transitions
Control Direction
Change the direction of the transition. Slide is the default transition.
Don't block the floating action button
Move the floating action button vertically to accommodate the snackbar height.
Consecutive Snackbars
Per Google's guidelines, when a second snackbar is triggered while the first is displayed, the first should start the contraction motion downwards before the second one animates upwards.
Customized Snackbars
If you have been reading the overrides documentation page but you are not confident jumping in, here are examples of how you can change the look of a Snackbar.