Android如何在单击expandablelistview时获取子级的父级名称
我创建了一个类似于下面的 下面是我的代码 ThreeLevelListAdapterAndroid如何在单击expandablelistview时获取子级的父级名称,android,expandablelistview,expandablelistadapter,android-expandable-list-view,Android,Expandablelistview,Expandablelistadapter,Android Expandable List View,我创建了一个类似于下面的 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[]>> d
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;
}
}
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;
}
}
我怎样才能做到这一点
任何帮助都将不胜感激。步骤1: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的(我稍后会告诉你为什么?) 步骤2:您可以创建另一个全局列表(如果经常使用,也可以是静态的)。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: 此列表将保存单击项的索引(我假设我们不知道recycler视图中有多少子列表)。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)保存索引 ())然后用户单击子列表,然后我们保存索引,依此类推 现在,假设用户按如下方式单击:
- 从列表1->索引:4
- 从列表2->索引:2
- 从列表3->索引:3
每当我们有分支时,我们总是使用树结构,在第一个注释中,我以为您只有一个子列表,但现在在您的例子中,我们有多个子列表。所以你一定要使用树形结构。创建循环时要小心,可能会出现空指针异常。使用全局变量或inheritance@Vijay我如何使用它们?@Vijay从不使用全局变量找到一种方法来保持单击的层次结构。一个选项是保留树结构,以便在单击一个元素后可以轻松检查节点层次结构。呈现子项时,可以传递父项。所以,每个项目都知道谁是它的父母谢谢你的回答。我使用的是
ScrollView
而不是RecyclerView
。我还有一个公共类SecondLevelExpandableListView扩展了ExpandableListView{public SecondLevelExpandableListView(上下文){super(上下文);}受保护的度量空(int-widthMeasureSpec,int-heightMeasureSpec){heightmeaspect=measpect.makemeaspect(9999999,measpect.AT_最多);super.onMeasure(widthmaspect,heightmeaspect);}
我使用它就像final second SecondLevelExpandableListView secondLevelELV=new SecondLevelExpandableListView(context)
在三级列表适配器的getChildView
内在标题中
我正在获取孩子的直接父母姓名,例如M/S PAK MEDICOSE PHARMECY
父母是LICE-O-NIL CREAM
,父母是1112 STOP Town
好的,然后就变得很容易了,就像你读我的报告一样oach.Now在每个类中创建方法作为getParentsName(),它应该是递归的,就像第三个应该调用第二个,然后首先停止(使用null或任何东西)。你是说我们得到了直接的父级,然后它就变得非常容易了。getParentsName()应该从父类重写,我们可以很容易地获得父类名称。通过创建树结构的方式,您可以通过调用while(child.getParent()!=null){list.add(child.getName())}来访问父类。类似于此。给你的提示:将来,在应用自定义方式(如ExpandableList、musicPlayer、videoPlayer等)之前,一定要进行研究。有很多库可用于此类任务。这种习惯可以节省大量时间和精力。在google“ExpandableList library android github”上搜索
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);
});