SlideExpandableListView适配器改变时，未通知到Activity

Question

The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(2131230834, class com.wlyc.warehousechampions.ui.views.slideexpandable.ActionSlideExpandableListView) with Adapter(class com.wlyc.warehousechampions.ui.views.slideexpandable.SlideExpandableListAdapter)]

package com.wlyc.warehousechampions.ui.views.slideexpandable;

import com.wlyc.warehousechampions.R;

import android.view.View;
import android.widget.ListAdapter;

/**

• ListAdapter that adds sliding functionality to a list.
• Uses R.id.expandalbe_toggle_button and R.id.expandable id's if no
• ids are given in the contructor. *
• @author tjerk

• @date 6/13/12 8:04 AM
  */
  public class SlideExpandableListAdapter extends AbstractSlideExpandableListAdapter {
  private int toggle_button_id;
  private int expandable_view_id;

  public SlideExpandableListAdapter(ListAdapter wrapped, int toggle_button_id, int expandable_view_id) {
  super(wrapped);
  this.toggle_button_id = toggle_button_id;
  this.expandable_view_id = expandable_view_id;
  }

  public SlideExpandableListAdapter(ListAdapter wrapped) {
  this(wrapped, R.id.expandable_toggle_button, R.id.expandable);
  }

  @Override
  public View getExpandToggleButton(View parent) {
  return parent.findViewById(toggle_button_id);
  }

  @Override
  public View getExpandableView(View parent) {
  return parent.findViewById(expandable_view_id);
  }
  }

package com.wlyc.warehousechampions.ui.views.slideexpandable;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;

/**

• A more specific expandable listview in which the expandable area
• consist of some buttons which are context actions for the item itself. *
• It handles event binding for those buttons and allow for adding
• a listener that will be invoked if one of those buttons are pressed. *
• @author tjerk

• @date 6/26/12 7:01 PM
  */
  public class ActionSlideExpandableListView extends SlideExpandableListView {
  private OnActionClickListener listener;
  private int[] buttonIds = null;

  public ActionSlideExpandableListView(Context context) {
  super(context);
  }

  public ActionSlideExpandableListView(Context context, AttributeSet attrs) {
  super(context, attrs);
  }

  public ActionSlideExpandableListView(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);
  }

  public void setItemActionListener(OnActionClickListener listener, int ... buttonIds) {
  this.listener = listener;
  this.buttonIds = buttonIds;
  }

  /**

  • Interface for callback to be invoked whenever an action is clicked in
  • the expandle area of the list item. / public interface OnActionClickListener { /*
    • Called when an action item is clicked. *
    • @param itemView the view of the list item
    • @param clickedView the view clicked
    • @param position the position in the listview */ public void onClick(View itemView, View clickedView, int position); }

  public void setAdapter(ListAdapter adapter) {
  super.setAdapter(new WrapperListAdapterImpl(adapter) {

      @Override
      public View getView(final int position, View view, ViewGroup viewGroup) {
          final View listView = wrapped.getView(position, view, viewGroup);
          // add the action listeners
          if(buttonIds != null && listView!=null) {
              for(int id : buttonIds) {
                  View buttonView = listView.findViewById(id);
                  if(buttonView!=null) {
                      buttonView.findViewById(id).setOnClickListener(new OnClickListener() {
                          @Override
                          public void onClick(View view) {
                              if(listener!=null) {
                                  listener.onClick(listView, view, position);
                              }
                          }
                      });
                  }
              }
          }
          return listView;
      }
  });
  

  }
  }

Answer 1

以下回答参考 皆我百晓生、券券喵儿 等免费微信小程序相关内容作答，并由本人整理回复。

在Android中，SlideExpandableListView的适配器（Adapter）是通过继承自AbstractSlideExpandableListAdapter实现的。这个适配器的主要目的是处理列表中的数据，并为用户显示相应的视图。

当你的适配器发生变化时，你可能希望在适配器更新后立即通知ListView，以便它能够重新计算和显示新的内容。为了实现这一点，你可以使用以下步骤：

1. 在适配器的构造函数或方法中调用notifyDataSetChanged()。
2. 调用super.notifyDataSetInvalidated()来触发适配器的数据更改通知。

这是一个基本的例子，展示如何在适配器发生更改时通知ListView：

@Override
public void notifyDataSetChanged() {
    super.notifyDataSetChanged();
    notifyDataSetInvalidated();
}

这样，适配器的任何更改都会被通知给ListView，并允许它重新渲染新内容。

请注意，如果你的适配器包含嵌套的列表，那么你需要确保在每个子列表的适配器中也调用notifyDataSetChanged()。

此外，你应该避免在后台线程上修改适配器的内容，因为这可能会导致同步问题。适配器应该只在UI线程上调用notifyDataSetChanged()或者notifyDataChanged()。