在后台线程中加载数据

Question

代码

public class ContactSettings extends Fragment {
private RecyclerView contactsList;
private List<ContactsHelper> contacts = new ArrayList<>();
private LinearLayoutManager linearLayoutManager;
private ContactsAdapter mAdapter;
   View rootView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    rootView = inflater.inflate(R.layout.settings_contact, container, false);



    contactsList = (RecyclerView) rootView.findViewById(R.id.usersList);
    //Add the data first
    linearLayoutManager = new LinearLayoutManager(getActivity());
    //and then create a object and pass the lis
    mAdapter = new ContactsAdapter(contacts);

    contactsList.setHasFixedSize(true);
    contactsList.setLayoutManager(linearLayoutManager);
    contactsList.setAdapter(mAdapter);
    mAdapter.notifyDataSetChanged();




    return rootView;
}

@Override
public void onStart(){
    super.onStart();
    addDataToList();

}

public void addDataToList(){
ContentResolver contentResolver = getActivity().getContentResolver();
Cursor cursor = contentResolver.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC");
if (cursor != null) {
    if (cursor.getCount() > 0) {
        while (cursor.moveToNext()) {
            int hasPhoneNumber = Integer.parseInt(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER)));
            if (hasPhoneNumber > 0) {
                String id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
                String name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
                Cursor phoneCursor = contentResolver.query(
                        ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                        null,
                        ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[]{id},
                        null);
                if (phoneCursor != null) {
                    if (phoneCursor.moveToNext()) {
                        String phoneNumber = phoneCursor.getString(phoneCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                        contacts.add(new ContactsHelper(name, phoneNumber));
                        phoneCursor.close();
                    }
                }
            }
        }
    }
    cursor.close();
}

}

这从用户电话中获取联系人，但由于负载而花费时间进行活动，因此建议我异步加载它，但我不知道它如何工作。我查阅了一些教程，但仍不确定。有人可以制作此片段以在后台加载数据，并告诉我是否与从Firebase加载数据的方法相同吗