design 库升级 导致 反射调用失败

[mnlin0905]

对于design库: 如 27.1.1

public class BottomNavigationMenuView extends ViewGroup implements MenuView {
//...
    private boolean mShiftingMode = true;
    private BottomNavigationItemView[] mButtons;
//...

对于较高版本 design 库: 如 28.0.0

public class BottomNavigationMenuView extends ViewGroup implements MenuView {
//...
    private int labelVisibilityMode;
    private BottomNavigationItemView[] buttons;

//...
}

两者 BottomNavigationItemView[] 类型的 成员域 名字不同,一个为mButtons,一个为buttons,导致反射失败;

????