Components - Progress & Activity.

Progress and activity indicators are visual indications of an app loading content.

• A single visual indicator should be used to represent each type of operation. For example, a refresh operation should display either a refresh bar or an activity circle, but not both.
• Determinate indicators display how long an operation will take.
• Indeterminate indicators visualize an unspecified wait time.

Types Of Indicators

• When indicators are determinate they indicate how long an operation will take when the percentage complete is detectable.
• When indicators are indeterminate they request that the user wait while something finishes when it’s not necessary to indicate how long it will take.
• Both linear and circular progress indicators may be either determinate or indeterminate.

Behaviour

For Behaviour of different Indicators ClickHere