android的ViewGroup的addView出现奇怪BUG

我自定义了一个ViewGroup.通过addView进行添加子View却发现，居然在不同的系统版本下显示不一样呀。

android4.4的view出现在上层；

android6.6的view出现在底层

按理说：addView（）的循序不会改变呀。怎么搞得

能不能将代码给贴出来，看看

public class ScrollMenuView extends ViewGroup {

private final String TAG = "ScrollMenuView";

private Context mContext;
private final ArrayList<View> mMenusView = new ArrayList<>();
private MenuItemClickListener mMenuItemClickListener;
private View mBodyView;

private boolean target = false;

public ScrollMenuView(Context context) {
    this(context, null, 0);
}

public ScrollMenuView(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
}

public ScrollMenuView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    this.mContext = context;
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    int childCount = getChildCount();
    for (int i = childCount-1; i >= 0; i--) {
        measureChild(getChildAt(i), widthMeasureSpec, heightMeasureSpec);
    }
}

@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {

    int width = getMeasuredWidth();
    int height = getMeasuredHeight();

    if (getChildCount() >= 2) {
        int size = mMenusView.size();
        for (int i = 0; i < size; i++) {
            View targetView = mMenusView.get(i);
            View rightView = null;
            if (i != 0) {
                rightView = mMenusView.get(i - 1);
            }

            int r = width;
            if (rightView != null) {
                r = rightView.getLeft();
            }

            targetView.layout(r - targetView.getMeasuredWidth(), 0,
                    r, height);
            System.out.printf("\n\ti=%s:t=%s,l=%s,r=%s,b=%s\n",
                    i,
                    targetView.getTop(),
                    targetView.getLeft(),
                    targetView.getRight(),
                    targetView.getBottom()
            );
        }

        if (mBodyView != null) {
            mBodyView.layout(0, 0, width, height);
        }
    }

}

public void addMenuView(final View itemView) {
    itemView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            if (mMenuItemClickListener != null) {
                mMenuItemClickListener.onClick(itemView, mMenusView.size());
            }
        }
    });
    ViewGroup.LayoutParams layoutParams = itemView.getLayoutParams();
    if (layoutParams == null) {
        layoutParams = new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.MATCH_PARENT);
    }
    itemView.setLayoutParams(layoutParams);
    mMenusView.add(itemView);
    addView(itemView);

}

public void addMenuView(int drawableId, String text) {

    final Button menuBtn = new Button(mContext);
    menuBtn.setBackgroundResource(R.drawable.btn_bg);

    Drawable drawable = mContext.getResources().getDrawable(drawableId);
    drawable.setBounds(0, 0, drawable.getMinimumWidth(), drawable.getMinimumHeight());
    menuBtn.setCompoundDrawables(null, drawable, null, null);

    int pd = DensityUtils.dp2px(mContext, 20);
    menuBtn.setPadding(0, pd, 0, 0);
    menuBtn.setCompoundDrawablePadding(2);

    menuBtn.setText(text);
    menuBtn.setTextSize(12);
    menuBtn.setGravity(Gravity.CENTER);
    menuBtn.setTextColor(mContext.getResources().getColor(R.color.cornell_red2));
    LayoutParams params = new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,
            LayoutParams.MATCH_PARENT);
    menuBtn.setLayoutParams(params);

    menuBtn.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            if (mMenuItemClickListener != null) {
                mMenuItemClickListener.onClick(menuBtn, mMenusView.size());
            }
        }
    });
    addView(menuBtn);
    mMenusView.add(menuBtn);
}

public void setMenuBody(View body) {
    this.mBodyView = body;
    LayoutParams layoutParams = body.getLayoutParams();
    if (layoutParams == null) {
        layoutParams = new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.MATCH_PARENT);
    }
    this.mBodyView.setLayoutParams(layoutParams);
    addView(mBodyView);
}

public void setMenuItemClickListener(MenuItemClickListener menuItemClickListener) {
    mMenuItemClickListener = menuItemClickListener;
}

interface MenuItemClickListener {
    void onClick(View view, int index);
}

}

使用
mScrollMenuView = (ScrollMenuView) findViewById(R.id.scroll_menu);

    mScrollMenuView.addMenuView(R.mipmap.menu_delete,
            "delete1");
    mScrollMenuView.addMenuView(R.mipmap.menu_delete,
            "delete2");

    View view = LayoutInflater.from(this).inflate(R.layout.item_current_file, null);

// view.setBackgroundColor(getResources().getColor(R.color.charade));
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT);
view.setLayoutParams(params);
mScrollMenuView.setMenuBody(view);

关键是在不同的android系统出现了不一样的显示。