FragmentManager is already execu

依据

https://stackoverflow.com/questions/38722325/fragmentmanager-is-already-executing-transactions-when-is-it-safe-to-initialise/40829361#40829361 

将

FragmentAdapter adapter = new FragmentAdapter(getActivity().getSupportFragmentManager(), fragments, titleList);

更改为

FragmentAdapter adapter = new FragmentAdapter(getChildFragmentManager(),fragments,titleList);