When click on expandable ListView then checked Checkbox is automatically unchecked and Last CheckBox is checked

Question

Screnshot of When I checked first three CheckBoxes from ExpandableListView and expand first or second Item from it Then second CheckBox is automatically unchecked and last CheckBox is automatically Checked

Here is the Screenshot of it.

Here is my Custom adapter code

public class MyBaseExpandableListAdapter extends BaseExpandableListAdapter{
Context context;
ArrayList<Group_Items> group_al;

public MyBaseExpandableListAdapter(Context context,ArrayList<Group_Items> group_al) {
    this.context=context;
    this.group_al=group_al;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
    ArrayList<Child_Items> chList = group_al.get(groupPosition).getItems();

    return chList.get(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) {
    Child_Items ch = (Child_Items) getChild(groupPosition, childPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) context
                .getSystemService(context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.expandable_child_items, null);
    }
    TextView child = (TextView) convertView.findViewById(R.id.child);
    TextView dd = (TextView) convertView.findViewById(R.id.dd);
    TextView date= (TextView) convertView.findViewById(R.id.date);

    child.setText(ch.getChild_title().toString());
    dd.setText(ch.getDd().toString());
    date.setText(ch.getDate().toString());

    return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {
    ArrayList<Child_Items> chList = group_al.get(groupPosition).getItems();

    return chList.size();
}

@Override
public Object getGroup(int groupPosition) {

    return group_al.get(groupPosition);
}

@Override
public int getGroupCount() {

    return group_al.size();
}

@Override
public long getGroupId(int groupPosition) {

    return groupPosition;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    Group_Items gr = (Group_Items) getGroup(groupPosition);
    long group_id = getGroupId(groupPosition);

    if (convertView == null) {
        LayoutInflater inf = (LayoutInflater) context
                .getSystemService(context.LAYOUT_INFLATER_SERVICE);
        convertView = inf.inflate(R.layout.expandable_group_items, null);
    }

    TextView title = (TextView) convertView.findViewById(R.id.title);
    title.setText(gr.getName());
    CheckBox chk=(CheckBox) convertView.findViewById(R.id.chk);

    return convertView;
}

@Override
public boolean hasStableIds() {

    return true;
}

@Override
public boolean isChildSelectable(int arg0, int arg1) {

    return false;
}

}

Answer 1

You can use SparseBooleanArray for this

in your adapter, initialize and keep a sparse boolean array

SparseBooleanArray mSelections = new SparseBooleanArray();

in your getGroupView , do the following

@Override
public View getGroupView(int groupPosition, boolean isExpanded, 
                                   View convertView, ViewGroup parent) {
    Group_Items gr = (Group_Items) getGroup(groupPosition);
    long group_id = getGroupId(groupPosition);

    if (convertView == null) {
        LayoutInflater inf = (LayoutInflater) context
                .getSystemService(context.LAYOUT_INFLATER_SERVICE);
        convertView = inf.inflate(R.layout.expandable_group_items, null);
       // adding onClick listener on CheckBox for the very first time
       CheckBox chk=(CheckBox) convertView.findViewById(R.id.chk);
       chk.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                int position = (int) v.getTag();
                mSelections.put(position, !mSelections.get(position, false));
                ((CheckBox)v).setChecked(mSelections.get(position, false));
            }

       });
    }

    TextView title = (TextView) convertView.findViewById(R.id.title);
    title.setText(gr.getName());
    CheckBox chk=(CheckBox) convertView.findViewById(R.id.chk);
    chk.setTag(groupPosition);
    // reassigning checkbox to its ticked state
    chk.setChecked(mSelections.get(groupPosition, false));

    return convertView;
}