android - 自定义可扩展的 BaseExpandableListAdapter getGroupView 或 getChildView 永远不会被调用

Question

我有一个包含 2 个页面的 Viewpager，在第 1 页我填写了一个表单并滑动到第 2 页，其中包含 expandableList，我正在使用如下自定义适配器.

我在布局中包含了可扩展的 listview 和另一个按钮。

当我滑动到这个新页面时，我看到了空布局和按钮，可扩展列表从未显示。

我已经检查并发现 getGroupCount 返回的大小等于 arrayList 数据的大小。所以不是数据为空的问题。

在进一步分析中，我发现 getGroupView 以及 getChildView 永远不会被调用，我添加了一些日志语句来调试这些方法，它们永远不会被打印出来.但是构造函数被调用，getGroupCoun 也返回正确的值。我的实现是否正确？

public class FareStageExpandableListAdapter extends BaseExpandableListAdapter

{
private Context context;
private LayoutInflater inflater;
private ArrayList<TripTimings> data;
private SimpleDateFormat formatter;
private EditText fareField;
private TextView headerText;
private TextView childText;

public FareStageExpandableListAdapter(Context context,
        ArrayList<TripTimings> data)
{
    Log.d("FareStageExADapter", "Constructor called");
    this.context = context;
    this.inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    this.data = data;
    this.formatter = new SimpleDateFormat("HH:mm");

}

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

@Override
public int getChildrenCount(int groupPosition)
{
    return data.size() - 1 - groupPosition;
}

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

@Override
public Object getChild(int groupPosition, int childPosition)
{
    return data.get(groupPosition + childPosition);
}

@Override
public long getGroupId(int groupPosition)
{
    return data.get(groupPosition).hashCode();
}

@Override
public long getChildId(int groupPosition, int childPosition)
{
    return data.get(groupPosition + childPosition).hashCode() + 5;
}

@Override
public boolean hasStableIds()
{
    // TODO Auto-generated method stub
    return true;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parentView)
{
    TripTimings parent = data.get(groupPosition);
    if (convertView == null)
    {
        convertView = inflater.inflate(R.layout.fareadd_expanded_parent,
                parentView, false);
    }
    headerText = ((TextView) convertView.findViewById(R.id.originText));

    Log.d("Setting header text ", parent.getStop().getStop_name());
    headerText.setText(parent.getStop().getStop_name());
    return convertView;
}

@Override
public View getChildView(int groupPosition, int childPosition,
        boolean isLastChild, View convertView, ViewGroup childView)
{
    final TripTimings child = data.get(groupPosition + childPosition);
    if (convertView == null)
    {
        convertView = inflater.inflate(R.layout.fareadd_expanded_child,
                childView, false);
    }
    childText = ((TextView) convertView.findViewById(R.id.destinationText));

    Log.d("Setting child text ", child.getStop().getStop_name());
    childText.setText(child.getStop().getStop_name());

    return convertView;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition)
{
    // TODO Auto-generated method stub
    return false;
}

Answer 1

这就是当您 sleep 不足时会发生的情况。代码没有任何问题，只是 Adapter 从未添加到 expandablelistview