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如何更改java android中可扩展列表视图下方空白区域的背景颜色。我已将颜色设置为组视图和子视图。但是可扩展列表视图下方的空白区域是白色的。这不好。任何人都可以帮我改变空白空间的颜色吗？我已将以下适配器用于可扩展列表视图

   public class MyExpandableListAdapter extends BaseExpandableListAdapter {

    // Sample data set.  children[i] contains the children (String[]) for groups[i].
    public String[] groups = getResources().getStringArray(R.array.topic_sections);
    public String[][] children =  {getResources().getStringArray(R.array.group1_sections),getResources().getStringArray(R.array.group2_sections)};


  public Object getChild(int groupPosition, int childPosition) {
        return children[groupPosition][childPosition];
    }

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

    public int getChildrenCount(int groupPosition) {
        return children[groupPosition].length;
    }

    public TextView getGenericView() {
        // Layout parameters for the ExpandableListView
        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT, 45);

        TextView textView = new TextView(Topics.this);
        textView.setLayoutParams(lp);

        // Center the text vertically
        textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        // Set the text starting position
        textView.setPadding(45, 0, 0, 0);

        return textView;
    }

    public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
            View convertView, ViewGroup parent) {
        TextView textView = getGenericView();
        textView.setBackgroundResource(R.color.childview);
        textView.setText(getChild(groupPosition, childPosition).toString());
        textView.setTextSize(1, 15);
        return textView;
    }

    public Object getGroup(int groupPosition) {
        return groups[groupPosition];
    }

    public int getGroupCount() {
        return groups.length;
    }

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

  public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
            ViewGroup parent) {
        TextView textView = getGenericView();
        textView.setText(getGroup(groupPosition).toString());
        textView.setBackgroundResource(R.color.groupview);

        textView.setTextSize(2, 15);
        return textView;
    }

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

    public boolean hasStableIds() {
        return true;
    }


}
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