HarmonyOS 鸿蒙Next PageSliderProvider调用notifyDataChanged不会刷新数据

为啥PageSliderProvider调用notifyDataChanged不会刷新数据,只是走了getCount()方法,并没有走

createPageInContainer方法,怎么刷新数据啊. 这里说明一点数据内容有变化,但是getCount()的长度没变,难道鸿蒙是根据getCount()的长度有没有变化才刷新数据, 不会这么坑吧. 求教怎么刷新数据

/*


Copyright © 2021 Huawei Device Co., Ltd.
Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at


http://www.apache.org/licenses/LICENSE-2.0


Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package com.cmhi.hm.universalapp.mobaihe.provider;
import com.cmhi.hm.universalapp.ResourceTable;
import com.cmhi.hm.universalapp.mobaihe.OnItemClickListener;
import com.cmhi.hm.universalapp.mobaihe.model.MbhMediaRecommendGroup;
import com.cmhi.hm.universalapp.utils.TextUtils;
import com.cmhi.hm.universalapp.utils.ToastUtil;
import ohos.agp.components.*;
import ohos.app.Context;
import ohos.hiviewdfx.HiLog;
import ohos.hiviewdfx.HiLogLabel;
import java.util.ArrayList;
import java.util.List;
public class TabPagerProvider extends PageSliderProvider {
private static final HiLogLabel LABEL_LOG = new HiLogLabel(0, 0, “TabPagerProvider.class”);
List<MbhMediaRecommendGroup> data;
private OnMediaPageClickListener listener;
private Context context;
private MainMediaDataProvider mediaDataProvider;
private String mediaType;
/**
 * 构造
 *
 * @param context 上下文
 * @param data 数据源
 */
public TabPagerProvider(Context context, List&lt;MbhMediaRecommendGroup&gt; data) {
    this.data = data;
    this.context = context;
}

@Override
public int getCount() {
    return data.size();
}

@Override
public Object createPageInContainer(ComponentContainer componentContainer, int i) {
    Component componentAt = componentContainer.getComponentAt(i);
    HiLog.debug(LABEL_LOG, "TabPagerProvider ");

    PageItem pageItem;
    if(componentAt == null){
        componentAt = LayoutScatter.getInstance(context).parse(
                ResourceTable.Layout_item_tab, null, false);
        pageItem =  new PageItem(componentAt);
        componentAt.setTag(pageItem);
    }else {
        pageItem = (PageItem) componentAt.getTag();
    }
    pageItem.dlMoreContainer.setClickedListener(new Component.ClickedListener() {
        @Override
        public void onClick(Component component) {
            //跳到更多
            if(listener != null){
                String mediaType = data.get(i).getMediaType();
                listener.onMoreMediaCLick(mediaType);
            }
        }
    });
    pageItem.dlRefreshContainer.setClickedListener(new Component.ClickedListener() {
        @Override
        public void onClick(Component component) {
            //刷新当前类型
            ToastUtil.showToast("刷新");
            if(listener != null){
                mediaType = data.get(i).getMediaType();
                listener.onRefreshMediaClick(mediaType);
            }
        }
    });
    mediaDataProvider = new MainMediaDataProvider(data.get(i).getMediaList(), new OnItemClickListener() {
        @Override
        public void OnitemClick(int position) {
            ToastUtil.showToast("详情");
        }
    });
    TableLayoutManager tableLayoutManager = new TableLayoutManager();
    tableLayoutManager.setColumnCount(3);
    tableLayoutManager.setRowCount(2);
    pageItem.listContainer.setLayoutManager(tableLayoutManager);
    pageItem.listContainer.setItemProvider(mediaDataProvider);
    componentContainer.addComponent(componentAt);
    return componentAt;
}

@Override
public void destroyPageFromContainer(ComponentContainer componentContainer, int i, Object o) {
    componentContainer.removeComponent((Component) o);
}

@Override
public boolean isPageMatchToObject(Component component, Object o) {
    return component == o;
}

public void setData(List&lt;MbhMediaRecommendGroup&gt; datas) {
    this.data = datas;
//        if(!TextUtils.isEmpty(mediaType)){
//            if(data != null && data.size() >0){
//              for(int i =0; i<data.size();i++){
//                  if(mediaType.equals( data.get(i).getMediaType())){
//                      mediaDataProvider.refreshData(data.get(i).getMediaList());
//                      break;
//                  }
//              }
//            }
//        }
notifyDataChanged();
}
public void setClickListener(OnMediaPageClickListener listener){
    this.listener =listener;
}
public interface OnMediaPageClickListener{
    void onMoreMediaCLick(String mediaType);
    void onRefreshMediaClick(String mediaType);
    void onMediaDetailClick();
}

public static class PageItem {

    private  ListContainer listContainer;
    private  DependentLayout dlMoreContainer;
    private  DependentLayout dlRefreshContainer;

    PageItem(Component component){
        listContainer = (ListContainer) component.findComponentById(ResourceTable.Id_lc_media_list);
        dlMoreContainer = (DependentLayout) component.findComponentById(ResourceTable.Id_dl_more_container);
        dlRefreshContainer = (DependentLayout) component.findComponentById(ResourceTable.Id_dl_refresh_container);
    }
}
}