PopupMenuCompat

public static @Nullable View.OnTouchListener getDragToOpenListener(@NonNull Object popupMenu)

On API KITKAT and higher, returns an OnTouchListener that can be added to the anchor view to implement drag-to-open behavior.

When the listener is set on a view, touching that view and dragging outside of its bounds will open the popup window. Lifting will select the currently touched list item.

Example usage:

PopupMenu myPopup = new PopupMenu(context, myAnchor);
myAnchor.setOnTouchListener(PopupMenuCompat.getDragToOpenListener(myPopup));