after rotate, the spider can’t control the fragment
it is because the reference to the fragment lost after rotate,(the activity create again,show lost),but the fragment still here,we just need to find it bu tha
I find the the savedInstanceState auto,so we can
use if (savedInstanceState == null) {
mainFragment = new MainFragment();
Logger.d("create a mainFragment");
fragmentTransaction.add(R.id.frame_layout_main, mainFragment);
fragmentTransaction.commit();
}
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and find that mainFragment is null after rotate,so we need to get it back
