问题描述
我创建了一个如下所示的 3-level ExpandableListView
下面是我的代码
ThreeLevellistadapter
public class ThreeLevellistadapter extends Baseexpandablelistadapter {
String[] parentHeaders;
List<String[]> secondLevel;
private Context context;
List<LinkedHashMap<String,String[]>> data;
/**
* Constructor
* @param context
* @param parentHeader
* @param secondLevel
* @param data
*/
public ThreeLevellistadapter(Context context,String[] parentHeader,List<String[]> secondLevel,List<LinkedHashMap<String,String[]>> data) {
this.context = context;
this.parentHeaders = parentHeader;
this.secondLevel = secondLevel;
this.data = data;
}
@Override
public int getGroupCount() {
return parentHeaders.length;
}
@Override
public int getChildrenCount(int groupPosition) {
// no idea why this code is working
return 1;
}
@Override
public Object getGroup(int groupPosition) {
return groupPosition;
}
@Override
public Object getChild(int group,int child) {
return child;
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public long getChildId(int groupPosition,int childPosition) {
return childPosition;
}
@Override
public boolean hasstableIds() {
return true;
}
@Override
public View getGroupView(int groupPosition,boolean isExpanded,View convertView,ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_first,null);
TextView text = (TextView) convertView.findViewById(R.id.rowParentText);
text.setText(this.parentHeaders[groupPosition]);
return convertView;
}
@Override
public View getChildView(int groupPosition,int childPosition,boolean isLastChild,ViewGroup parent) {
final SecondLevelExpandableListView secondLevelELV = new SecondLevelExpandableListView(context);
String[] headers = secondLevel.get(groupPosition);
List<String[]> childData = new ArrayList<>();
HashMap<String,String[]> secondLevelData = data.get(groupPosition);
for (String key : secondLevelData.keySet()) {
childData.add(secondLevelData.get(key));
}
secondLevelELV.setAdapter(new SecondLevelAdapter(context,headers,childData));
secondLevelELV.setGroupIndicator(null);
secondLevelELV.setonGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
int prevIoUsGroup = -1;
@Override
public void onGroupExpand(int groupPosition) {
if (groupPosition != prevIoUsGroup)
secondLevelELV.collapseGroup(prevIoUsGroup);
prevIoUsGroup = groupPosition;
}
});
return secondLevelELV;
}
@Override
public boolean isChildSelectable(int groupPosition,int childPosition) {
return true;
}
}
二级适配器
public class SecondLevelAdapter extends Baseexpandablelistadapter {
private Context context;
List<String[]> data;
String[] headers;
ImageView ivGroupIndicator;
public SecondLevelAdapter(Context context,String[] headers,List<String[]> data) {
this.context = context;
this.data = data;
this.headers = headers;
}
@Override
public Object getGroup(int groupPosition) {
return headers[groupPosition];
}
@Override
public int getGroupCount() {
return headers.length;
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition,ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_second,null);
TextView text = (TextView) convertView.findViewById(R.id.rowSecondText);
String groupText = getGroup(groupPosition).toString();
text.setText(groupText);
return convertView;
}
@Override
public Object getChild(int groupPosition,int childPosition) {
String[] childData;
childData = data.get(groupPosition);
return childData[childPosition];
}
@Override
public long getChildId(int groupPosition,int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition,ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_third,null);
TextView textView = convertView.findViewById(R.id.rowThirdText);
textView.setonClickListener(v -> {
// here I want to get the all parent names of the child clicked
Common.showToast(context,"This Feature is under development",Toast.LENGTH_LONG);
});
String[] childArray = data.get(groupPosition);
String text = childArray[childPosition];
textView.setText(text);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
String[] children = data.get(groupPosition);
return children.length;
}
@Override
public boolean hasstableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition,int childPosition) {
return true;
}
}
我想做什么?
我想在单击子项时获取所有父名称。例如,如上图所示。如果我点击 M/S PAK MEDICOSE PHARMACY
或 M/S SERVAID PHARMACY
,那么我想获得他们的父名 LICE-O-NIL CREAM
和 1112 STOP TOWNSHIP
等等。
TextView textView = convertView.findViewById(R.id.rowThirdText);
textView.setonClickListener(v -> {
//Here I want to get the names of parent
Common.showToast(context,Toast.LENGTH_LONG);
});
我怎样才能做到这一点?
任何帮助将不胜感激。
解决方法
第 1 步:您已经有了要在回收站视图中显示的元素列表。现在创建这些列表的列表可以(稍后我会告诉你为什么?)
第 2 步:您可以做的是创建另一个全局列表(如果经常使用也是静态的)。提示:如果适配器在其他类中,则通过构造函数传递列表。
说明: 这个列表将保存被点击的项目的索引(我假设我们不知道回收器视图中有多少个子列表)。当用户单击第一个回收器视图列表中的项目时,我们将通过 (~adapter.getAdapterPosition ()) 然后用户单击子列表,然后我们也保存该索引,依此类推...
现在,假设用户是这样点击的:
- 从列表 1 -> 索引:4
- 来自列表 2 -> 索引:2
- 来自列表 3 -> 索引:3
那么我们现在要做的是,我们有一个包含索引的列表和另一个包含 n 个列表的列表(其中 n = 子列表的数量)。 listArrayList 包含按顺序排列的列表, indexClickedList 包含我们单击的元素的索引, indexClickedList 中的索引是我们从中单击项目的列表编号,因此您可以从 listList 访问它。这样就可以得到我们点击的元素的父项。在这里您必须使用 while 循环,因为我们不知道有多少子列表。你继续直到我们到达 list.get(whatEverIndex == null)。
每当我们有分支时,我们总是使用树结构,在第一条评论中,我以为您只有一个子列表,但现在在您的情况下我们有多个。所以你绝对应该使用树结构。进行循环时要小心,您可能会遇到空指针异常。