1、首先在Activity里动态加载Fragment,
BlankFragment blankFragment = new BlankFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction beginTransaction = fragmentManager.beginTransaction();
beginTransaction.add(R.id.fragmentcontent, blankFragment);
beginTransaction.addToBackStack(null);
beginTransaction.commit();
2、然后在Fragment里的onAttach()方法中获得Activity的Textview控件的引用,
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