多层嵌套Fragment获取父Activity（Fragment）控件及方法

在fragment中加入以下代码：

 @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        if (activity instanceof FatherActivity) {
            FatherActivity fatherActivity= (FatherActivity) activity;
            textView= (TextView)fatherActivity.findViewById(R.id.textView);
        }
    }

原博客：https://blog.csdn.net/qq_34163551/article/details/78415442