Question

我已经实施了ExpandableListView和BaseExpandableListAdapter。我想显示一个GroupObjects列表。每个GroupObject（ExpandableList中的顶级项）都有一个3个ChildObjects的ArrayList（ExpandableList中的子项）。

我正在使用viewHolder-pattern。 GroupObjects正确显示。展开第一个GroupObject后，getChildView()被调用3次并正确显示其ChildObjects。

但是，只要我展开另一个GroupObject，getChildView()就会返回第一个GroupObject 的ChildObjects。由于第二次调用的convertView不为null，因此它总是返回相同的ChildObjects。

以下是一些代码：

@Override
public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild,
        View convertView, ViewGroup parent) {
    final ChildObject childobject = (ChildObject)getChild(groupPosition, childPosition);
    ChildViewholder childViewholder;

    if (convertView == null) {
        childViewholder = new ChildViewholder();
        LayoutInflater inflater = (LayoutInflater)context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        if (!childobject.isReserved()) {
            convertView = inflater.inflate(R.layout.childobject_free,
                    parent, false);
            childViewHolder.layout = (RelativeLayout)convertView
                    .findViewById(R.id.childobject_free_layout);

        } else {
            final Reservation reservation = childobject.getReservation();
            convertView = inflater.inflate(
                    R.layout.childobject_reserved, parent, false);
            childViewHolder.layout = (RelativeLayout)convertView.findViewById(R.id.reserved_layout);

            childViewHolder.reservationImage = (ImageView)convertView.findViewById(R.id.reservationImage);
            childViewHolder.reservationName = (TextView)convertView.findViewById(R.id.reservationName);
            childViewHolder.buttonFinish = (ImageButton)convertView
                    .findViewById(R.id.finishButton);
            childViewHolder.buttonCancel = (ImageButton)convertView
                    .findViewById(R.id.cancelButton);
            childViewHolder.progressBar = (ProgressBar)convertView
                    .findViewById(R.id.reservationProgress);

            childObject.getTimer().setProgressBar(childViewHolder.progressBar);
            childViewHolder.reservationName.setText(reservation.getName());
            childViewHolder.reservationImage.setImageBitmap(reservation.getBitmap());

            childViewHolder.buttonFinish.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    DrawerClickHandler.finishReservation(reservation);
                }
            });

            childViewHolder.buttonCancel.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    DrawerClickHandler.cancelReservation(reservation);
                }
            });

        }

        convertView.setTag(childViewholder);

    }else{
        childViewholder = (ChildViewholder)convertView.getTag();
    }

        childViewHolder.groupPosition = groupPosition;
        childViewHolder.childPosition = childPosition;

        return convertView;
}

在getChildView()的前3次调用中，convertView仅为null。

如果您需要更多代码，请与我们联系。

感谢任何帮助。

ExpandableListView为每个GroupView显示相同的ChildView

0 个答案: