How do I add a footer View to a child List in a ExpandableListActivity?

问题

I've been attempting to work out how to add a child View to a child List in an ExpandableListActivity, but to no avail.

I can get the ExpandableListView and call addFooterView() on it, but that just adds the new View to the group list. (The data comes from a Cursor).

Any suggestions gratefully received.

Cheers

James

回答1:

Unfortunately there is no ExpandableListView.addChildFooterView() method, or even ExpandableListView.addFooterView() for that matter. The method you are calling is the inherited ListView.addFooterView(), which just adds the view as the last item in the entire list. It was not overridden for group/child behavior.

The simplest way to do this is probably just to build something into your ExpandableListAdapter implementation so that getChildrenCount() returns the data set size + 1, and then return the footer view in getChildView() for the appropriate position. Also, getChildView() provides a boolean parameter to flag when it is retrieving the last child in any specific group.

回答2:

I had made a custom adapter like this then pass its instance to my ExpandableListView

public class MyExpandableAdapter extends BaseExpandableListAdapter {
Context context;
List<ParentObject> parentObjects;

public MyExpandableAdapter(Context context, List<ParentObject> parentObjects)
{
    this.context = context;
    this.parentObjects = parentObjects;
}
@Override
public int getGroupCount() {
    return parentObjects.size();
}

 //Add 2 to childcount. The first row and the last row are used as header and footer to childview
@Override
public int getChildrenCount(int i) {
    return parentObjects.get(i).childObjects.size() +2;
}

@Override
public ParentObject getGroup(int i) {
    return parentObjects.get(i);
}

@Override
public ChildObject getChild(int i, int i2) {
    return parentObjects.get(i).childObjects.get(i2);
}

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

@Override
public long getChildId(int i, int i2) {
    return 0;
}

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

@Override
public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup)
{
    ParentObject currentParent = parentObjects.get(i);
    if(view ==null)
    {
        LayoutInflater inflater =(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.parent_row,null);
    }
    TextView txtMother = (TextView)view.findViewById(R.id.txtMother);
    TextView txtFather = (TextView)view.findViewById(R.id.txtFather);
    txtMother.setText(currentParent.mother);
    txtFather.setText(currentParent.father);
    return view;
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean b, View view, ViewGroup viewGroup) {
    ParentObject currentParent = getGroup(groupPosition);
    LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    //the first row is used as header
    if(childPosition ==0)
    {
        view = inflater.inflate(R.layout.child_header, null);
        TextView txtHeader = (TextView)view.findViewById(R.id.txtHeader);
        txtHeader.setText(currentParent.textToHeader);
    }

    //Here is the ListView of the ChildView
    if(childPosition>0 && childPosition<getChildrenCount(groupPosition)-1)
    {
        ChildObject currentChild = getChild(groupPosition,childPosition-1);
        view = inflater.inflate(R.layout.child_row,null);
        TextView txtChildName = (TextView)view.findViewById(R.id.txtChildName);
        TextView txtChildAge = (TextView)view.findViewById(R.id.txtChildAge);
        txtChildName.setText(currentChild.childName);
        txtChildAge.setText("Age: " + String.valueOf(currentChild.age));
    }
    //the last row is used as footer
    if(childPosition == getChildrenCount(groupPosition)-1)
    {
        view = inflater.inflate(R.layout.child_footer,null);
        TextView txtFooter = (TextView)view.findViewById(R.id.txtFooter);
        txtFooter.setText(currentParent.textToFooter);
    }
    return view;
}

@Override
public boolean isChildSelectable(int i, int i2) {
    return false;
}

}

Here is solution to the issue http://robusttechhouse.com/how-to-add-header-footer-to-expandablelistview-childview/. Hope that helps!

回答3:

There is a way more easier solution:

Just set a "OnClickListener" to the applied View:

View view = inflater.inflate(R.layout.xxx, null);
view.setOnClickListener(new OnClickListener(){
 @Override
public void onClick(View v) {
    //do something
 }
});

Very easy thing which solved it!

来源：https://stackoverflow.com/questions/4542449/how-do-i-add-a-footer-view-to-a-child-list-in-a-expandablelistactivity

标签

android

listview

expandablelistview