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问题描述
我已经创建了一个类似下面的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, View convertView, 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;
}
}
Second LevelAdapter
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, boolean isExpanded, View convertView, 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, int childPosition, boolean isLastChild, View convertView, 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？
我想在单击子对象时获取所有父对象名称。例如，如上图所示。如果我单击M/S PAK MEDICOSE PHARMACY或M/S SERVAID PHARMACY，则希望获取它们的父级名称LICE-O-NIL CREAM和1112 STOP TOWNSHIP，依此类推。
TextView textView = convertView.findViewById(R.id.rowThirdText);
textView.setOnClickListener(v -> {
//Here I want to get the names of parent
Common.showToast(context,"This Feature is under development", Toast.LENGTH_LONG);
});
如何实现此目标？
如有任何帮助，我们将不胜感激。
推荐答案
第1步：您已经有了在回收器视图中显示的元素列表。现在创建这些列表的列表，好吗(我稍后会告诉您为什么？)
步骤2：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： 该列表将保存被点击项目的索引(我假设我们不知道回收器视图中有多少子列表)。当用户单击第一个回收者视图列表中的项目时，我们将通过(~Adapter.getAdapterPosition)保存索引 ()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，假设用户像这样点击：
- 来自列表1-&>索引：4
- 来自列表2-&>索引：2
- 来自列表3-&>索引：3
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