使用bringchildtofront()设置Z视图顺序

private void moveToBack(View currentView) {
    ViewGroup viewGroup = ((ViewGroup) currentView.getParent());
    int index = viewGroup.indexOfChild(currentView);
    for(int i = 0; i<index; i++) {
        viewGroup.bringChildToFront(viewGroup.getChildAt(i));
    }
}

bringChildToFront(child)

showNext() showprevious()

setDisplayedChild() indexOfChild()

vf.setDisplayedChild(vf.indexOfChild(child));