How to move the origin of an Android View into its center?

Question

I made an own Joystick-View and now I have to calculate the distance between the point the user is dragging to and the center of the view. This would be much easier if I can translate the origin of the view from the left top (actual origin) to the center (new origin)!

Does anyone know how to do this?

My View, schematic:

Answer 1

如果您的视图是ImageView，请将imageView.scaleType更改为ImageView.ScaleType.CENTER。