Question

我正在使用可扩展的列表视图来填充类别数据。很少有类别具有子类别，而有些则没有。父类别列表显示完美。问题在于子类别。添加的数据是正确的，但是在适配器中呈现数据时，groupId 1中的子类别会添加到具有子类别的其他groupId中，因此groupId子类别会显示在其他类别中。

将数据设置为HashMap时，下面的代码处于活动状态。

private List<String> listDataHeader = new ArrayList<>();
private HashMap<String, List<String>> listDataChild = new 
HashMap<String, List<String>>();
private List<String> childValues = new ArrayList<>();

@Override
public void categoriesFetched(List<ArticleCategory> categories) {
    listDataHeader.clear();
    listDataChild.clear();
    childValues.clear();
    for (int i = 0; i < categories.size(); i++) {
        if (categories.get(i).getSub_categories().size() > 0) {
            childValues = new ArrayList<>();
            for (int j = 0; j < categories.get(i).getSub_categories().size(); j++) {
                childValues.add(categories.get(i).getSub_categories().get(j).getValue());
            }
            listDataChild.put(categories.get(i).getValue(), childValues);
        } else {
            listDataChild.put(categories.get(i).getValue(), new ArrayList<String>());
        }
        listDataHeader.add(categories.get(i).getValue());
    }
    articlesCategoryAdapter.notifyDataSetChanged();
}

以下代码段是呈现视图时的适配器类。

  public class ArticlesCategoryAdapter extends BaseExpandableListAdapter {

private Context _context;
private List<String> _listDataHeader = new ArrayList<>();
private HashMap<String, List<String>> _listDataChild = new HashMap<>();

public ArticlesCategoryAdapter(Context context, List<String> listDataHeader, HashMap<String, List<String>> listChildData) {
    this._context = context;
    this._listDataHeader = listDataHeader;
    this._listDataChild = listChildData;
}

@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) {
    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.article_category_child, null);
        String childText = (String) getChild(groupPosition, childPosition);
        AppCompatTextView txtListChild = (AppCompatTextView) convertView.findViewById(R.id.txtSubCategoryName);
        txtListChild.setText(childText);
    }
    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);
    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.article_category_group, null);
        AppCompatTextView lblListHeader = (AppCompatTextView) convertView.findViewById(R.id.txtMainCategoryName);
        lblListHeader.setText(headerTitle);
    }
    return convertView;
}

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

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

}

Answer 1

回收视图时未正确设置视图。试试这个：

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
    String childText = (String) getChild(groupPosition, childPosition);
    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) this._context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.article_category_child, null);
    }
    AppCompatTextView txtListChild = (AppCompatTextView) convertView.findViewById(R.id.txtSubCategoryName);
    txtListChild.setText(childText);
    return convertView;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    String headerTitle = (String) getGroup(groupPosition);
    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) this._context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.article_category_group, null);
    }
    AppCompatTextView lblListHeader = (AppCompatTextView) convertView.findViewById(R.id.txtMainCategoryName);
    lblListHeader.setText(headerTitle);
    return convertView;
}

希望有帮助！

可扩展ListView将子数据复制到父数据中

1 个答案: