如何在 android 的 ExpandableListView 中从可绘制文件中添加不同的图像？

Question

我创建了一个带有可展开列表视图的导航抽屉。每个子项都有一个文本视图和一个图像视图。任何子项都具有相同的图像。我想为每个子项目放置不同的图像。我有一个 ExpandableListAdapter 类。我应该对此类的 getChildView 方法进行一些更改吗？我怎样才能改变它？这是我的 ExpandableListAdapter 类：

public class ExpandableListAdapter extends BaseExpandableListAdapter {

private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;




public ExpandableListAdapter(Context context, List<String> listDataHeader,
        HashMap<String, List<String>> listChildData ) {
    this._context = context;
    this._listDataHeader = listDataHeader;
    this._listDataChild = listChildData;

}

@Override
public Object getChild(int groupPosition, int childPosititon) {
    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .get(childPosititon);
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public View getChildView(int groupPosition, final int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {




    final String childText = (String) getChild(groupPosition, childPosition);

    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.drawer_list_item, null);
    }

    ImageView iconn =(ImageView)convertView.findViewById(R.id.thumbNail);



   iconn.setImageResource(R.drawable.car_73);

    TextView txtListChild = (TextView) convertView
            .findViewById(R.id.textView);

    txtListChild.setTextColor(Color.BLUE);
    txtListChild.setText(childText);
    return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {
    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
            .size();
}

@Override
public Object getGroup(int groupPosition) {
    return this._listDataHeader.get(groupPosition);
}

@Override
public int getGroupCount() {
    return this._listDataHeader.size();
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {
    String headerTitle = (String) getGroup(groupPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.list_group, null);
    }

    TextView lblListHeader = (TextView) convertView
            .findViewById(R.id.lblListHeader);
    lblListHeader.setTypeface(null, Typeface.BOLD);
    lblListHeader.setText(headerTitle);

   return convertView;
}

@Override
public boolean hasStableIds() {
    return false;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}

}

这是列表适配器部分的活动类：

listDataChild.put(listDataHeader.get(0), receivedVal ); // 标题，子数据

  listDataChild.put(listDataHeader.get(1), top250);


  listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);

  expListView.setAdapter(listAdapter);

（receivedVal 和 top250 是数组列表，它们都有值）

Answer 1

    private void prepareListData() {
            listDataHeader = new ArrayList<String>();
            listDataChild = new HashMap<String, List<String>>();

            // Adding child data
            listDataHeader.add("imageId1");
            listDataHeader.add("imageId2");
            listDataHeader.add("imageId3");
            listDataHeader.add("imageId4");
            listDataHeader.add("imageId5");
            listDataHeader.add("imageId6");

            // Adding child data
            List<String> Chicken = new ArrayList<String>();
            imageId1.add("imagename");
            imageId1.add("imagename");
            imageMap.put("imageId", R.drawable.imagename)
}

Answer 2

您似乎正在设置一个预定义的图标。

iconn.setImageResource(mIcons[childPosition]);
iconn.setImageResource(R.drawable.car_73);

删除这一行可能会有所帮助：

iconn.setImageResource(R.drawable.car_73);