避免片段列表数据在recyclerView上重复

试试这个

View view; // declare this globally

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    if(view == null){ // initialize if view is null
     view = inflater.inflate(R.layout.vaccine_fragment_, container, false);

    recyclerVaccine = (RecyclerView) view.findViewById(R.id.recyclerVaccine);
    recyclerVaccine.setLayoutManager(new LinearLayoutManager(getActivity()));

    vaccineList.clear();// i use it to slove the problem.--------------
    testData();
    vaccineAdapter = new VaccineAdapter(getActivity(), vaccineList);
    recyclerVaccine.setAdapter(vaccineAdapter);
    vaccineAdapter.notifyDataSetChanged();
    }
    return view;
}