I have an ExpandableListView view and I've implemented OnChildClickListener, but I need to get the group of that child, more specifically - the text staying as a label of that group.
How can I do that?
Should I implement OnGroupClickListener?
Can somebody show me how to use getPackedPositionGroup() or any of the getPacked<somethingf>() methods to get to the text on the group element of expandable list view?
[Edit - addition]
the called is in Map class, which is something like this:
public class MapCommand extends Activity implements OnChildClickListener {
.....
#Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
firstStepSwitcher(v, childPosition);
///HERE IS WHERE I WANT TO FIND THE GROUP!!!
return true;
}
}
The view itself is in the layout XML. I do not manage its display manually.
And it has separate class for adapter.
What I did wrong was that I used to take the adapter for that ExpandableListView like this:
in (public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id))
parent.getAdapter();
But after looking into detail in the specification I found that I should take it like this:
ExpandableListAdapter mAdapter = parent.getExandableListAdapter();
from there on I do not have problem to get my group by calling:
String groupName = (String) mAdapter.getGroup(groupPosition);
Related
It got me wondering on how to implement an "onChildChildClickListener" into this three level expandable list view after answering the question of how to populate three level expandable list view (Populate different arrays in third layer of expandableListView).
How does one implement the third level being Clickable?
Example code by BKN is published on githube here:
https://github.com/ngocchung/ThreeLevelExpListView
Does anybody have an idea?
Help would be gladly appreciated as I would like to implement this into an showcase app as a part of my Masterthesis.
Found the solution after reading the comments in this How to add Three Level ListView in ExpandableListView in android
this needs to be implemented in the ParentLevelAdapter in the public View getChildView part.
#Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final CustomExpListView secondLevelExpListView = new CustomExpListView(this.mContext);
String parentNode = (String) getGroup(groupPosition);
secondLevelExpListView.setAdapter(new SecondLevelAdapter(this.mContext, mListData_SecondLevel_Map.get(parentNode), mListData_ThirdLevel_Map));
secondLevelExpListView.setGroupIndicator(null);
//newcode
secondLevelExpListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener(){
#Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition,long id)
{ String selectText = ((TextView) v).getText().toString();
switch (selectText){
case "ItemName you want to do something with":
//Actions you want to do when clicking this item
break;
case "ItemName2 you want to do something with":
//Actions you want to do when clicking this second item
break;
default:
//default actions on all other items
}
return false;}
});
return secondLevelExpListView;
}
I am beginner to android I need some Help about List and Extended List in one Drawer
I know that this question is posted here several Time but I am unable to understand that Actually I want to make a list like:
Please Help me Step by Step
thak you!...
It's native behavior of ExpandableListView so if any Item doesn't have children, implicitly won't be expanded but you need to set OnClickListener for both groups (Items) and children (Options):
public boolean onChildClick(ExpandableListView parent, View row,
int groupPosition, int childPosition, long id) {
// callback method after click for Options
return false;
}
public boolean onGroupClick(ExpandableListView parent, View row,
int groupPosition, long id) {
/** if you are using BaseAdapter subclass implementation **/
if(adapter.getGroup(groupPosition).getChildren() == null) {
// item doesn't have children
return true;
}
else {
// has children
return false;
}
}
I create an Expandable ListView which contains 3 group and each group have several child.
In OnCreate i expand group one with exLv.expandGroup(0); then i want to click child of this group without user touch it (dynamically).
I tried exLv.setSelectedChild and it didn't work.
I just want to do this one time at the onCreate. How to do this?
In your activity class override the OnChildClickListener() method from list view.
expandbleList.setOnChildClickListener(new OnChildClickListener() {
#Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
//do something here.
}
});
im blazilian so, my english is not good.
So.. i need get view of group in expandablelistview for get your object tag throught view.getTag() method.
follow me in this example:
ExpandableListView
--> group (i need this view)
----> child
----> child
----> child
--> group (i need this view)
----> child
----> child
My code:
#Override
public boolean onChildClick(final ExpandableListView parent, final View v,
final int groupPosition, final int childPosition, final long id) {
/* I NEED GET VIEW OF GROUP FOR GET YOUR TAG*/
View vParent = parent.getChildAt(groupPosition); // dont work after first group
Programa v2 = (Programa) parent.getTag(); // return null
// v parameter is a child of group
return true;
}
in my adapter:
#Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
TwoLineListItem view = (TwoLineListItem) LayoutInflater.from(contexto)
.inflate(android.R.layout.simple_expandable_list_item_2,
parent, false);
String programa = map.keySet().toArray(new String[map.keySet().size()])[groupPosition];
view.getText1().setText(programa);
view.getText2().setText("PROGRAMA LOCAL");
view.setTag(programas.get(groupPosition)); // i need get this in child click listener
return convertView = view;
}
any idea? thanks
To get the group view from an ExpandableListView, you do something as follows:
public View getGroupView(ExpandableListView listView, int groupPosition) {
long packedPosition = ExpandableListView.getPackedPositionForGroup(groupPosition);
int flatPosition = listView.getFlatListPosition(packedPosition);
int first = listView.getFirstVisiblePosition();
return listView.getChildAt(flatPosition - first);
}
If your code is correct, you want to get the group view for the child so that you can call getTag() on it, correct?
If so, why not just skip that step and access the value of the tag, set by programas.get(groupPosition) manually?
You can do this by calling:
programas.get(groupPosition) right on the top of your onChildClick method since you get the group position value there too.
Edit in response to your comment:
The issue here is that you're not going to be able to get the view of the group through the adapter since it might involve recreating the view due to recycling of views in lists. If this method doesn't work, I strongly suggest modifying your code to make it work.
If programas is one of the inputs to your adapter, then call getGroup(groupPosition) on your adapter to access it. Else, make a public method in your adapter class to allow retrieval of that value.
I tried AedonEtLIRA answer but it only obtained the first item in the list.
My solution was to set a tag in my adapter's getGroupView method.
#Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater layoutInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.listitem_group, null);
}
//This is your data object that you might be using for storage that can be returned by your getGroup(groupPosition) function
GroupDataDto groupDataDto = (GroupDataDto) getGroup(groupPosition);
String name = groupDataDto.getName();
convertView.setTag(name);
...
Now in your Fragment / Activity, in your onGroupExpand and onGroupCollapse:
GroupDataDto groupDataDto = (GroupDataDto) listAdapter.getGroup(groupPosition);
ImageView arrow = (ImageView) getView().findViewWithTag(groupDataDto.getName()).findViewById(R.id.expandable_arrow_down);
Then I can do my animation on the arrow, which is why I wanted to get that group view.
Well I used the following code to access a TextView in a group:
#Override
public boolean onChildClick(final ExpandableListView parent, final View v,
final int groupPosition, final int childPosition, final long id) {
View vParent = mAdapter.getGroupView(groupPosition, true, null, null);
Programa v2 = (Programa) vParent.getTag();
return true;
}
I hope it helps
Hi guys I am trying to change the value of the parent by clicking a child in a expandable list. I have looked for a solution but cant find anything.
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id){
ExpandableListAdapter itemAdapter = parent.getExpandableListAdapter();
String selectedItem = (String)itemAdapter.getChild(groupPosition, childPosition);
groupHeader(selectedItem);
if(parent.isGroupExpanded(groupPosition)){
parent.collapseGroup(groupPosition);
}
return true;
}
});
An ExpandableListView depends on an adapter to obtain its values. Those values come from some sort of data structure, often an ArrayList or even a simple array. In your onChildClick(), pass a reference to the data structure used to build your ExpandableListAdapter and modify the data structure directly, followed by a call to notifyDataSetChanged().
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id)
{
ExpandableListAdapter itemAdapter = parent.getExpandableListAdapter();
String selectedItem = (String)itemAdapter.getChild(groupPosition, childPosition);
groupHeader(selectedItem);
if(parent.isGroupExpanded(groupPosition))
{
parent.collapseGroup(groupPosition);
}
// your logic here
// expandableListArrayList.add() or expandableListArrayList.remove()
// or whatever
itemAdapter.notifyDataSetChanged();
return true;
}
});
You probably have to extend the adapter to create the functionality you need. Your question is a bit nebulous because I can't see the overall structure of your code, but this should give you a running start.