如何使用 volley 在 Expandable ListView 中映射 childView

Question

我正在使用 Volley 在 android 中制作可扩展列表视图。我已成功映射 parentView。但是我遇到了如何在可扩展列表视图中映射 childView 的问题。在我的情况下，所有子类别都显示在一个父类别中。我该如何处理。我如何在可扩展列表视图中正确映射 childView。这是我在 logcat.

中显示的列表快照

截图：

这是我的代码，我从中得到了 JSON 的回复。

String ChildName = null;
JSONObject object = null,childObject= null;
try {
    object =new JSONObject(response);
    JSONArray headerArray = object.getJSONArray("ListCategories");
    for (int i=0;i<headerArray.length();i++){
        JSONObject jsonObject = headerArray.getJSONObject(i);
        final int Id = jsonObject.getInt("CategoryID");
        final String name = jsonObject.getString("CategoryName");

        JSONArray childArray = headerArray.getJSONObject(i).getJSONArray("ListChildCategories");
        for (int j=0;j<childArray.length();j++) {
            childObject = childArray.getJSONObject(j);
            ChildId = childObject.getInt("ID");
            ChildName = childObject.getString("Name");
            child.add(new ChildCategory(ChildId, ChildName));
        }
        Log.e("childArray", childArray.toString());
        header.add(new Category(Id, name));
    }

} catch (JSONException e) {
    e.printStackTrace();
}
adapter = new ExpandableCategoryAdapter(context,header,child);
expandableListView.setAdapter(adapter);
adapter.notifyDataSetChanged();

这里是可扩展类别适配器：

public class ExpandableCategoryAdapter extends BaseExpandableListAdapter {


    private Context _context;
    private ArrayList<Category> header;
    private ArrayList<ChildCategory> childCategories;
    private HashMap<String, String> child;
    final String name = null;
    private TextView header_text;

    public ExpandableCategoryAdapter(Context context, ArrayList<Category> listDataHeader,ArrayList<ChildCategory> listDataChild) {
        this._context = context;
        this.header = listDataHeader;
        this.childCategories = listDataChild;
    }

    @Override
    public int getGroupCount() {
        // Get header size
        return header.size();

    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return childCategories.size();
    }

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

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

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ChildCategory child = (ChildCategory) getChild(groupPosition, childPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_item_category, parent, false);
        }
        TextView child_text = (TextView) convertView.findViewById(R.id.expandedListItem);
        child_text.setText(child.getName());
        return convertView;
    }
    @Override
    public boolean hasStableIds() {
        // TODO Auto-generated method stub
        return true;
    }
    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        Category category = (Category) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_group_category, parent, false);
        }
        header_text = (TextView) convertView.findViewById(R.id.listTitle);
        header_text.setText(category.getCategoryName());
        if (isExpanded) {
            header_text.setTypeface(null, Typeface.BOLD);
            header_text.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_extract_black_24dp, 0);
        } else {
            header_text.setTypeface(null, Typeface.NORMAL);
            header_text.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_add_black_24dp, 0);
        }

        return convertView;
    }

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

我不知道我哪里做错了。提前谢谢你

Answer 1

child list应该按照header/group打散，所以有一个allChild list为ArrayList<ArrayList<ChildCategory>>。试试这个：

String ChildName = null;
JSONObject object = null,childObject= null;
ArrayList<ArrayList<ChildCategory>> allChild = new ArrayList<ArrayList<ChildCategory>>(); // Added
try {
    object =new JSONObject(response);
    JSONArray headerArray = object.getJSONArray("ListCategories");
    for (int i=0;i<headerArray.length();i++){
        JSONObject jsonObject = headerArray.getJSONObject(i);
        final int Id = jsonObject.getInt("CategoryID");
        final String name = jsonObject.getString("CategoryName");

        JSONArray childArray = headerArray.getJSONObject(i).getJSONArray("ListChildCategories");
        child = new ArrayList<ChildCategory>(); // Added
        for (int j=0;j<childArray.length();j++) {
            childObject = childArray.getJSONObject(j);
            ChildId = childObject.getInt("ID");
            ChildName = childObject.getString("Name");
            child.add(new ChildCategory(ChildId, ChildName));
        }
        Log.e("childArray", childArray.toString());
        allChild.add(child); // Added
        header.add(new Category(Id, name));
    }

} catch (JSONException e) {
    e.printStackTrace();
}
adapter = new ExpandableCategoryAdapter(context,header,allChild); // Changed
expandableListView.setAdapter(adapter);

适配器：

public class ExpandableCategoryAdapter extends BaseExpandableListAdapter {

private Context _context;
private ArrayList<Category> header;
private ArrayList<ArrayList<ChildCategory>> childCategories; // Changed
private HashMap<String, String> child;
final String name = null;
private TextView header_text;

public ExpandableCategoryAdapter(Context context, ArrayList<Category> listDataHeader,ArrayList<ArrayList<ChildCategory>> listDataChild) { //Changed
    this._context = context;
    this.header = listDataHeader;
    this.childCategories = listDataChild;
}

@Override
public int getGroupCount() {
    // Get header size
    return header.size();
}

@Override
public int getChildrenCount(int groupPosition) {
    return childCategories.get(groupPosition).size(); // Changed
}

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

@Override
public Object getChild(int groupPosition, int childPosition) {
    return childCategories.get(groupPosition).get(childPosition); // Changed
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
    ChildCategory child = (ChildCategory) getChild(groupPosition, childPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.list_item_category, parent, false);
    }
    TextView child_text = (TextView) convertView.findViewById(R.id.expandedListItem);
    child_text.setText(child.getName());
    return convertView;
}

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

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    Category category = (Category) getGroup(groupPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.list_group_category, parent, false);
    }
    header_text = (TextView) convertView.findViewById(R.id.listTitle);
    header_text.setText(category.getCategoryName());
    if (isExpanded) {
        header_text.setTypeface(null, Typeface.BOLD);
        header_text.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_extract_black_24dp, 0);
    } else {
        header_text.setTypeface(null, Typeface.NORMAL);
        header_text.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_add_black_24dp, 0);
    }

    return convertView;
}

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

希望对您有所帮助！

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