场景：ActivityA嵌套Fragment，点击按钮跳转到ActivityB， 在B 页面进行一些操作返回A页面时在onActivityResult() 中刷新fragment。
private void initFragment() {
String ids = StringUtil.LongIds2str(mIds);
if (fragment != null ) {
fragment = new TopicListFragment().newInstance(ids);
getSupportFragmentManager().beginTransaction().replace(R.id.fl_container, fragment).commitAllowingStateLoss();
} else {
fragment = new TopicListFragment().newInstance(ids);
getSupportFragmentManager().beginTransaction().add(R.id.fl_container, fragment).commit();
}
}
http://www.androiddesignpatterns.com/2013/08/fragment-transaction-commit-state-loss.html
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