How is the order of displaying View components in Android applications implemented?

In Android, the order of displaying View components is determined by their order of addition to the ViewGroup hierarchy and the z-order property (order along the Z axis). Components added later are drawn on top of those added earlier. The ViewGroup.dispatchDraw() method also plays an important role, as it sequentially calls the drawing of child elements.

Additionally, the display order can be managed using the bringToFront() method (which moves a View to the top level) and the setZ() method (starting from API 21, which sets the position along the Z axis).

Example:

val parent = LinearLayout(context)
val view1 = View(context)
val view2 = View(context)

parent.addView(view1) // view1 will be below view2
parent.addView(view2) // view2 will be displayed on top of view1

// To bring view1 to the top:
view1.bringToFront()
parent.invalidate() // refresh the display

Thus, the display order depends on the order of addition and the methods for managing the z-position.