Android Expandale列表不在单击时展开

我试图在这里扩展列表点击可扩展的标题视图。但是我被卡住了为什么我不能显示子列表

这是我的活动课

adapter = new    MyExpandableAdapter(getActivity(),parentHashMap,parentObjectCollection);
        expandableListView.setAdapter(adapter)
        // Listview Group expanded listener
        expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
            @Override
            public void onGroupExpand(int groupPosition) {
                Toast.makeText(getActivity(),        parentObjectCollection.get(groupPosition) + " Expanded", Toast.LENGTH_SHORT).show();
            }
        });

适配器类是：

 public class MyExpandableAdapter extends BaseExpandableListAdapter {
private Context context;
private List<String> parentObjectsCollection;
private HashMap<String, List<MarkerInfoData>> parentHashMap;
/* ArrayList<MarkerInfoData> child_list;
LayoutInflater inflater;*/

public MyExpandableAdapter(Context context, HashMap<String, List<MarkerInfoData>> hashmap, List<String> list) {
    parentHashMap = hashmap;
    this.context = context;
    this.parentHashMap = hashmap;
    this.parentObjectsCollection = list;
}


@Override
public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
    //String childTitle = (String) getChild(groupPosition, childPosition);
    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.child_row, parent, false);
    }
    TextView cityName = (TextView) convertView.findViewById(R.id.txtLocationcityName);
    TextView cityAddress = (TextView) convertView.findViewById(R.id.txtLocationcityAddress);
    TextView cityDistance = (TextView) convertView.findViewById(R.id.txtcityLocationDistanceFromCurrentLocation);
    cityName.setText(parentHashMap.get(parentObjectsCollection.get(groupPosition)).get(childPosition).markerName);
    cityAddress.setText(parentHashMap.get(parentObjectsCollection.get(groupPosition)).get(childPosition).markerAddress);
    String distanceInMiles = parentHashMap.get(parentObjectsCollection.get(groupPosition)).get(childPosition).distance;
    if (distanceInMiles != null && distanceInMiles.length() > 0) {
        cityDistance.setText(distanceInMiles + "\nMiles");
    } else {
        cityDistance.setText("");
    }
    //childtextview.setText(childTitle);

    return convertView;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    String GroupTitle = (String) getGroup(groupPosition);
    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.parent_row, parent, false);
    }
    TextView parenttextview = (TextView) convertView.findViewById(R.id.textviewparent);
    parenttextview.setText(GroupTitle);
    return convertView;
}

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

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

@Override
public int getChildrenCount(int groupPosition) {
     return this.parentHashMap.get(this.parentObjectsCollection.get(groupPosition)).size();
}

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

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


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


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

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

公共类MyExpandableAdapter扩展了BaseExpandableListAdapter{
私人语境；
私有列表parentObjectsCollection；
私有HashMap parentHashMap；
/*ArrayList子列表；
充气机*/
公共MyExpandableAdapter（上下文上下文、哈希映射、哈希映射、列表）{
parentHashMap=hashmap；
this.context=上下文；
this.parentHashMap=hashmap；
this.parentObjectsCollection=列表；
}
@凌驾
公共视图getChildView（int-groupPosition，final int-childPosition，boolean isLastChild，View-convertView，ViewGroup-parent）{
//String childTitle=（String）getChild（groupPosition，childPosition）；
if（convertView==null）{
LayoutFlater充气器=（LayoutFlater）context.getSystemService（context.LAYOUT\u充气器\u服务）；
convertView=充气机。充气（R.layout.child_行，父，false）；
}
TextView cityName=（TextView）convertView.findViewById（R.id.txtLocationcityName）；
TextView cityAddress=（TextView）convertView.findViewById（R.id.txtLocationcityAddress）；
TextView cityDistance=（TextView）convertView.findViewById（R.id.txtcityLocationDistanceFromCurrentLocation）；
cityName.setText（parentHashMap.get（parentObjectsCollection.get（groupPosition））.get（childPosition.markerName）；
cityAddress.setText（parentHashMap.get（parentObjectsCollection.get（groupPosition））.get（childPosition.markerAddress）；
String distanceInMiles=parentHashMap.get（parentObjectsCollection.get（groupPosition））.get（childPosition）.distance；
if（distanceInMiles！=null&&distanceInMiles.length（）>0）{
cityDistance.setText（distanceInMiles+“\n英里”）；
}否则{
cityDistance.setText（“”）；
}
//childtextview.setText（childTitle）；
返回视图；
}
@凌驾
公共视图getGroupView（int groupPosition、布尔isExpanded、视图convertView、视图组父级）{
字符串GroupTitle=（字符串）getGroup（groupPosition）；
if（convertView==null）{
LayoutFlater充气器=（LayoutFlater）context.getSystemService（context.LAYOUT\u充气器\u服务）；
convertView=充气机。充气（R.layout.parent\u行，parent，false）；
}
TextView parenttextview=（TextView）convertView.findViewById（R.id.textviewparent）；
parenttextview.setText（GroupTitle）；
返回视图；
}
@凌驾
公共对象getChild（int-groupPosition，int-childPosition）{
返回this.parentHashMap.get（this.parentObjectsCollection.get（groupPosition））.get（childPosition）；
}
@凌驾
公共长getChildId（int-groupPosition，int-childPosition）{
返回子位置；
}
@凌驾
公共整数getChildrenCount（整数组位置）{
返回此.parentHashMap.get（this.parentObjectsCollection.get（groupPosition））.size（）；
}
@凌驾
公共对象getGroup（int-groupPosition）{
返回此.parentObjectsCollection.get（groupPosition）；
}
@凌驾
public int getGroupCount（）{
返回parentObjectsCollection.size（）；
}
@凌驾
公共长getGroupId（int-groupPosition）{
返回组位置；
}
@凌驾
公共布尔表ID（）{
返回true；
}
@凌驾
公共布尔值isChildSelectable（int-groupPosition，int-childPosition）{
返回true；
}
}

我认为您的代码中缺少onGroupClick方法，如果处理了click，该方法将返回true。

试试这个

  expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
        @Override
        public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
            Toast.makeText(MainActivity.this,headers.get(groupPosition)+"--"+headeritems.get(headers.get(groupPosition)).get(childPosition),Toast.LENGTH_SHORT).show();
            return false;
        }
    });

---

请参阅此处：-

post XML of

R.layout.parent_row

file.parentrow正在膨胀问题在子行中返回此.parentHashMap.get（this.parentObjectsCollection.get（groupPosition））.size（）；返回null。我在代码中添加了这个。expandableListView.setOnGroupExpandListener（新的expandableListView.OnGroupExpandListener（）{@Override public void onGroupExpand（int groupPosition）{Toast.makeText（getActivity（），parentObjectCollection.get（groupPosition）+“Expanded”，Toast.LENGTH_SHORT.show（）；}）;