关于XListview无法加载更多数据的问题，望解答

[Android_BigData_]

代码如下：

刚开始下拉刷新可以加载数据，但是会跳到顶部，加了判断后无法加载更多数据，必须先下拉刷新一次才能加载下一页的数据

各位看看问题出到哪了

public class ContactlistFragment extends Fragment {

    private TextView zb_title;
    private XListView zb_list;
    private RelativeLayout progress;
    private int page = 1;
    private List<ZbInfo> infos = new ArrayList<>();
    private List<ZbInfo> infosMore ;
    private ZbInfo zbInfo;
    private ZbAdapter zbAdapter;
    private JSONArray datas;
    private ImageView noNet;
    public ContactlistFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_contactlist, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        progress= (RelativeLayout) getView().findViewById(R.id.proces_chat);
        zb_title = (TextView) getActivity().findViewById(R.id.title_top);
        zb_title.setText("直播间");
        noNet = (ImageView) getActivity().findViewById(R.id.zb_noNet);
        zb_list = (XListView) getActivity().findViewById(R.id.zb_list);
        zb_list.setXListViewListener(new XListView.IXListViewListener() {
            @Override
            public void onRefresh() {
                page = 1;
                infos.clear();
                zbAdapter.notifyDataSetChanged();
                showFooter();
                initData();
                onLoad();
            }

            @Override
            public void onLoadMore() {
                page++;
                initData();
                onLoad();//加载完数据停止加载页面
            }
        });
        if (zbAdapter == null){
            zbAdapter = new ZbAdapter(getActivity() , infos);
        }else {
            zb_list.setAdapter(zbAdapter);
            zbAdapter.notifyDataSetChanged();
        }
        initData();
    }

    private void initData() {
        getData("打码"+page);
    }

    private void getData(String url) {
        RequestParams params=new RequestParams(url);
        x.http().get(params, new Callback.CommonCallback<String>() {
            @Override
            public void onSuccess(String result) {
                infosMore = new ArrayList<>();
                try {
                    datas = new JSONObject(result).getJSONArray("data");
                    for (int i=0;i<datas.length();i++){
                        zbInfo = new ZbInfo();
                        JSONObject object = datas.getJSONObject(i);
                        zbInfo.setImage(object.getString("image"));
                        zbInfo.setSubject(object.getString("subject"));
                        zbInfo.setStsj(object.getString("ztsj"));
                        zbInfo.setDidian(object.getString("didian"));
                        zbInfo.setAbstracts(object.getString("abstract"));
                        zbInfo.setLinumber(object.getString("linumber"));
                        zbInfo.setAid(object.getString("aid"));
                        zbInfo.setFlvurl(object.getString("flvurl"));
                        infosMore.add(zbInfo);
                    }
                    if (infosMore==null || infosMore.size() == 0){
                        hideFooter();
                        return;
                    }else{
                        infos.addAll(infosMore);
                        zbAdapter = new ZbAdapter(getActivity(),infos);
                        if (page==1){
                            zb_list.setAdapter(zbAdapter);
                        }else {
                            zbAdapter.notifyDataSetChanged();
                        }
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {
                ConnectivityManager connectivityManager = (ConnectivityManager)getActivity().getSystemService(getActivity().CONNECTIVITY_SERVICE);
                NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
                if(networkInfo == null || !networkInfo.isAvailable()) {
                    Toast.makeText(getActivity(),"请保持网络畅通!", Toast.LENGTH_SHORT).show();
                    zb_list.setVisibility(View.GONE);
                    noNet.setVisibility(View.VISIBLE);
                } else {
                    Toast.makeText(getActivity(),"地址错误!", Toast.LENGTH_SHORT).show();
                }
            }

            @Override
            public void onCancelled(Callback.CancelledException cex) {

            }

            @Override
            public void onFinished() {
                progress.setVisibility(View.GONE);
            }
        });
    }
    private void onLoad() {
        zb_list.stopRefresh();
        zb_list.stopLoadMore();
        zb_list.setRefreshTime("刚刚");
    }

    public void showFooter() {
        XListViewFooter footer = new XListViewFooter(getActivity());
        footer.show();
        zb_list.setPullLoadEnable(true);
    }

    public void hideFooter() {
        XListViewFooter footer = new XListViewFooter(getActivity());
        footer.hide();
        zb_list.setPullLoadEnable(false);
    }
}