Question

我希望能够创建一个包含父级和子级复选框的多级列表视图。

我已经能够使用ExpandableListAdapter获取工作列表视图，但是我无法为复选框创建一种通信方式。

我的愿望是，当选中父复选框时，所有子复选框都将被选中，当取消选中时，相反。此外，如果未选中父复选框并且选择了子项，则应选中父复选框。

有很多关于单层复选框的教程，但我还没有找到一篇描述我上面所说的内容。

非常感谢任何帮助！

这是我的ExtendableListAdapter类：

public class ExpandableListAdapter extends BaseExpandableListAdapter {

private Context _context;
private List<String> _listDataHeader; // header titles
private List<Boolean> _listDataBoolean; // header checkbox values
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;
private List<ArrayList<Boolean>> _listChildBoolean;

public ExpandableListAdapter(Context context, List<String> listDataHeader,
        HashMap<String, List<String>> listChildData,
        List<Boolean> listDataBoolean,
        List<ArrayList<Boolean>> listChildBoolean) {
    this._context = context;
    this._listDataHeader = listDataHeader;
    this._listDataChild = listChildData;
    this._listDataBoolean = listDataBoolean;
    this._listChildBoolean = listChildBoolean;
}

@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.list_item, null);
    }

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

    txtListChild.setText(childText);

    CheckBox chk = (CheckBox) convertView
            .findViewById(R.id.lblChildCheckbox);
    chk.setChecked(_listChildBoolean.get(groupPosition).get(childPosition));

    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);

    Boolean bool = _listDataBoolean.get(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);

    CheckBox chk2 = (CheckBox) convertView
            .findViewById(R.id.lblHeaderCheckbox);
    chk2.setChecked(bool);

    return convertView;
}

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

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

}

Answer 1

您必须将OnCheckChangeListeners添加到复选框。

带有复选框的多级Listview - 单击监听器

1 个答案: