可扩展 ListView 中的 Gridview 中的复选框在滚动时未选中

Question

我有一个可展开的列表视图。在它的子项中是一个gridview。在 gridview 中有自定义复选框。

现在的问题是当我选中一个复选框并向下滚动，甚至关闭父视图时，检查就消失了。

类似这样的：

滚动前检查屏幕：

滚动后检查屏幕：

这是我的 ExpandableListView 适配器：

public class CreateProfileExpandableAdapter extends BaseExpandableListAdapter {

    ArrayList<CreateProfileFecetsHeaderModel> al;
    Activity activity;

    public CreateProfileExpandableAdapter(Activity activity, ArrayList<CreateProfileFecetsHeaderModel> al) {
        this.activity = activity;
        this.al = al;
    }

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

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

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

        View v = convertView;

        if (v == null) {
            LayoutInflater inflater = (LayoutInflater) activity.getSystemService
                    (Context.LAYOUT_INFLATER_SERVICE);
            v = inflater.inflate(R.layout.create_profile_child, parent, false);
        }

        ExpandableHeightGridView gridViewChildren = (ExpandableHeightGridView) v.findViewById(R.id.gridViewChildren);
        gridViewChildren.setExpanded(true);

        CreateProfileChildAdapter createProfileChildAdapter = new CreateProfileChildAdapter(activity, al.get(groupPosition).getChildren());
        gridViewChildren.setAdapter(createProfileChildAdapter);


        return v;

    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return 1;
    }

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

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

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

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
                             View convertView, ViewGroup parent) {

        View v = convertView;

        if (v == null) {
            LayoutInflater inflater = (LayoutInflater) activity.getSystemService
                    (Context.LAYOUT_INFLATER_SERVICE);
            v = inflater.inflate(R.layout.create_profile_group, parent, false);
        }

        TextView textViewGroup = (TextView) v.findViewById(R.id.textViewGroup);
        textViewGroup.setText(al.get(groupPosition).getText());

        return v;

    }

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

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


}

Gridview 适配器：

public class CreateProfileChildAdapter extends BaseAdapter {

    Activity activity;
    ArrayList<CreateProfileFecetsChildModel> al;
    int index = -1;

    public CreateProfileChildAdapter(Activity activity, ArrayList<CreateProfileFecetsChildModel> al) {
        // TODO Auto-generated constructor stub
        this.activity = activity;
        this.al = al;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return al.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return al.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    private static class ViewHolder {
        CheckBox checkBoxChild;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        final ViewHolder viewHolder;
        final int pos = position;
        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(activity);
            convertView = inflater.inflate(R.layout.create_profile_grid_child, parent, false);
            viewHolder = new ViewHolder();

            viewHolder.checkBoxChild = (CheckBox) convertView.findViewById(R.id.checkBoxChild);

            convertView.setTag(viewHolder);

        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }


        viewHolder.checkBoxChild.setText(al.get(position).getTitle());

        viewHolder.checkBoxChild.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {

                if (b) {
                    viewHolder.checkBoxChild.setTextColor(activity.getResources().getColor(R.color.white));
                } else {
                    viewHolder.checkBoxChild.setTextColor(activity.getResources().getColor(R.color.black));
                }
            }
        });

        return convertView;
    }

}

Answer 1

问题是视图在没有重置其状态的情况下被回收。想象一下在一个屏幕上显示 20 个项目，但一次只显示四个项目，这意味着 GridViewAdapter 使用四个，也许五个视图。滚动浏览列表时，这些视图会轮流显示您的项目：

解决方案：

1. 您必须在适配器的 CreateProfileFecetsHeaderModel 类型的子列表条目中存储有关视图状态的所有信息（在您的情况下：标记为选中的内容）。
2. 在 Adapter 的 getChildView() 中，使用 position 从 Adapter 的子项中获取选中状态，并相应地设置持有者的 CheckBox。

Answer 2

由于它是可扩展适配器，您需要知道 groupid、selectedchild、id。 尝试如下...

@Override
public View getChildView(int groupPosition, int childPosition,
                         boolean isLastChild, View convertView, ViewGroup parent) {
    final Pair<Long, Long> tag = new Pair<Long, Long>(
            getGroupId(groupPosition),
            getChildId(groupPosition, childPosition));
    ViewHolder viewHolder = null;
    if (convertView == null) {
        convertView = inflater.inflate(R.layout.item_countryoforigin, null);
        viewHolder = new ViewHolder(convertView);
        convertView.setTag(viewHolder);
    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }
    viewHolder.checkBox.setTag(tag);
    viewHolder.checkBox.setChecked(mCheckedItems.contains(tag));
    viewHolder.textview.setText((CharSequence) getText(groupPosition, childPosition));
    viewHolder.checkBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final CheckBox cb = (CheckBox) v;
            final Pair<Long, Long> tag = (Pair<Long, Long>) v.getTag();
            if (cb.isChecked()) {
                mCheckedItems.add(tag);
            } else {
                mCheckedItems.remove(tag);
            }

        }
    });
    return convertView;
}
public Set<Pair<Long, Long>> getCheckedItems() {
    return mCheckedItems;
}

你可以调用 getcheckitems .....