In Android, how does one trigger the motionevent. action_cancel event?

For this question, the android documentation is very short and difficult to understand. A foreign web page is also described in detail, which is written here to share with you:

The original article is as follows:

You receive this when a parent takes possession of the motion,Example when the user has dragged enough wait ss a list view or scroll view that it will start scrolling instead of leader you press the buttons inside of it.

This means:

This event is triggered when your finger (or other) moves the screen, for example, this event is triggered when you drag a listview or a scrollview on the screen with your finger instead of pressing the button above.