BaseExpandableListAdapter 为每个组位置返回相同的子级

Posted 2023-05-07

【中文标题】BaseExpandableListAdapter 为每个组位置返回相同的子级

【英文标题】：BaseExpandableListAdapter returns same child for every group position

【发布时间】：2021-05-25 21:21:42

【问题描述】：

我对 ExpandableList 有疑问，它以正确的顺序和名称显示所有组元素，但每个组的子元素都显示为我选择的第一个组项目的子元素。无论我做什么，所有组的子元素都保持不变。每组只有一个孩子。

这是我正在使用的 JSON 的一部分：

[

    "PK_Sevice_ID": 45,
    "Service_Name": "Interior",
    "Category_ID": 32,
    "Category_Name": "Legal",
    "Service_Model": 
        "PK_Sevice_ID": 45,
        "Service_Name": "Ministry of Interior",
        "Updated_At": "2019-05-20T00:00:00",
        "Service_Address": "Adress 1",
        "Open_Hours": null,
        "Contact_Details": "",
        "State_Name": "Serbia",
        "Services_Count": 1,
        "Longitude": "",
        "Latitude": "",
        "Service_Description": "",
        "Category_ID": 32,
        "Category_Name": "Legal",
        "Icon_Link": "law.png"
    
,

    "PK_Sevice_ID": 47,
    "Service_Name": "UNHCR",
    "Category_ID": 32,
    "Category_Name": "Legal",
    "Service_Model": 
        "PK_Sevice_ID": 47,
        "Service_Name": "UNHCR",
        "Updated_At": "2019-05-20T00:00:00",
        "Service_Address": "Adress 2",
        "Open_Hours": null,
        "Contact_Details": "",
        "State_Name": "Serbia",
        "Services_Count": 1,
        "Longitude": "",
        "Latitude": "",
        "Service_Description": "Provides information",
        "Category_ID": 32,
        "Category_Name": "Legal",
        "Icon_Link": "law.png"
    
,

    "PK_Sevice_ID": 48,
    "Service_Name": "Human Rights ",
    "Category_ID": 32,
    "Category_Name": "Legal",
    "Service_Model": 
        "PK_Sevice_ID": 48,
        "Service_Name": "Human Rights ",
        "Updated_At": "2019-05-20T00:00:00",
        "Service_Address": "Adress 3",
        "Open_Hours": null,
        "Contact_Details": "",
        "State_Name": "Serbia",
        "Services_Count": 1,
        "Longitude": "",
        "Latitude": "",
        "Service_Description": "A non governmental organization that provides professional free legal advice and assistance",
        "Category_ID": 32,
        "Category_Name": "Legal",
        "Icon_Link": "law.png"
    

]

这是适配器类：

public class AllServicesExpandableList extends BaseExpandableListAdapter 

private Context context;
private ArrayList <ParentServicesModel> mList;
private MapView mapView;
public AllServicesExpandableList(Context context, ArrayList <ParentServicesModel> list, MapView mMapView) 
    this.context = context;
    this.mList = list;
    this.mapView = mMapView;


@Override
public int getGroupCount() 
    return mList.size();


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


@Override
public Object getGroup(int groupPosition) 
    return this.mList.get(groupPosition).getServiceName();


@Override
public ServicesWithCategoryModel getChild(int groupPosition, int childPosition) 
    return mList.get(groupPosition).getServiceModel();


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


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


@Override
public boolean hasStableIds() 
    return false;


@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) 
    String listTitle = (String) getGroup(groupPosition);
    if (convertView == null) 
        

        LayoutInflater layoutInflater = (LayoutInflater) this.context.
                getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = layoutInflater.inflate(R.layout.list_header_service, null);
    
    TextView listTitleTextView = (TextView) convertView
            .findViewById(R.id.txt_description);
    listTitleTextView.setTypeface(null, Typeface.BOLD);
    listTitleTextView.setText(listTitle);
    return convertView;


@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) 
    if (convertView == null) 
        LayoutInflater layoutInflater = (LayoutInflater) this.context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = layoutInflater.inflate(R.layout.list_item_service, null);
        TextView txt_address_description = convertView.findViewById(R.id.txt_address_description);
        TextView txt_telephones = convertView.findViewById(R.id.txt_telephones);
        TextView txt_hours_description = convertView.findViewById(R.id.txt_hours_description);
        txt_address_description.setText((CharSequence) getChild(groupPosition, childPosition).getServiceAddress());
        txt_telephones.setText((CharSequence) getChild(groupPosition, childPosition).getContactDetails());
        txt_hours_description.setText((CharSequence) getChild(groupPosition, childPosition).getOpenHours());
        
    
    return convertView;


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

为了简单起见，我期望这些数据：

组 1 -孩子1

组 2 -Child2

组 3 -Child3

但是假设我点击 Group2 我会得到这个：

组 1 -Child2

组 2 -Child2

组 3 -Child2

感谢您的任何建议

【参考方案1】：

试试这个：

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) 
    if (convertView == null) 
        LayoutInflater layoutInflater = (LayoutInflater) this.context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = layoutInflater.inflate(R.layout.list_item_service, null);
    
    TextView txt_address_description = convertView.findViewById(R.id.txt_address_description);
    TextView txt_telephones = convertView.findViewById(R.id.txt_telephones);
    TextView txt_hours_description = convertView.findViewById(R.id.txt_hours_description);
    txt_address_description.setText((CharSequence) getChild(groupPosition, childPosition).getServiceAddress());
    txt_telephones.setText((CharSequence) getChild(groupPosition, childPosition).getContactDetails());
    txt_hours_description.setText((CharSequence) getChild(groupPosition, childPosition).getOpenHours());
    
    return convertView;

【讨论】：

这是解决方案，从没想过这是问题所在。谢谢你 1000 次。