Using toast for form success and error input

1. When should you not use toast notifications?
2. Are Toast messages accessible?
3. What are toast messages used for?

When should you not use toast notifications?

Status indicator. Avoid using toasts for very critical information or alerts. Users may accidentally dismiss or entirely miss a toast, so it is best to avoid using toasts for important information. Additionally, avoid using toasts, critical or not, if it requires a user action.

Are Toast messages accessible?

As per the Android developer guide, a toast message can be displayed on any place on the screen using setGravity(int, int, int) method.

What are toast messages used for?

A toast provides simple feedback about an operation in a small popup. It only fills the amount of space required for the message and the current activity remains visible and interactive. Toasts automatically disappear after a timeout.