Question

I have an ExpandableListView with a checkbox next to group name and when expanded, child items with checkbox as well.

Let’s suppose I have 4 groups with 50 childs. When a group is expanded, and I click on select all checkbox, everything works fine, all checkbox are selected and keep their state if I scroll.

But if I scroll untill the last child of the list, scrolling gets buggy after that ( scrolling to the top and then touching the screen to stop the scrolling doesn’t work anymore), clicking on group doesn’t work anymore too, untill I click on selectall checkbox again.
Clicking on a child checkbox does nothing, I must click on selectall checkbox for everything to work.

I changed Focusable state of the child checkbox, group checkbox and tried many ways, but I can not find a solution to this. Do you have an idea of where it is coming from?

public class ExpandableListAdapter extends BaseExpandableListAdapter {


    LayoutInflater cinflater;
    LayoutInflater ginflater;
    ArrayList<Group> array;
    Context context;


    public ExpandableListAdapter(Context context, ArrayList<Group> array) {
        super();

        cinflater = LayoutInflater.from(context);
        ginflater = LayoutInflater.from(context);

        this.array = array;
        this.context = context;

    }


    public class ChildViewHolder {

        CheckBox contactcheckbox;
        TextView name;

    }


    @Override
    public int getChildrenCount(int groupPosition) {
        // TODO Auto-generated method stub
        return array.get(groupPosition).getContacts().size();
    }


    private OnCheckedChangeListener contactchecklistener = new OnCheckedChangeListener() {
               @Override
               public void onCheckedChanged(CompoundButton checkboxView, boolean isChecked) {

                   Contact contact = (Contact) checkboxView.getTag();
                   contact.setCheck(isChecked);

               }

            };

    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {

        ChildViewHolder cholder;

        if(convertView == null){

            cholder = new ChildViewHolder();

            convertView = cinflater.inflate(R.layout.childsitems, null);

            cholder.name = (TextView) convertView.findViewById(R.id.childnametextview);

            cholder.contactcheckbox = (CheckBox) convertView.findViewById(R.id.childcheckbox);
            cholder.contactcheckbox.setOnCheckedChangeListener(contactchecklistener);


            convertView.setTag(cholder);

        }else{

            cholder = (ChildViewHolder) convertView.getTag();

        }

        cholder.contactcheckbox.setTag(array.get(groupPosition).getContacts().get(childPosition));
        cholder.contactcheckbox.setChecked(array.get(groupPosition).getContacts().get(childPosition).isCheck());

        cholder.name.setText(array.get(groupPosition).getContacts().get(childPosition).getName());

        return convertView;
    }



    public class GroupViewHolder {
        TextView groupname;
        CheckBox groupcheck;

    }


    @Override
    public int getGroupCount() {
        // TODO Auto-generated method stub
        return array.size();
    }

    private OnCheckedChangeListener groupchecklistener = new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            int index = (Integer) buttonView.getTag();

            for(int i = 0;i<array.get(index).getContacts().size();i++){
                array.get(index).getContacts().get(i).setCheck(isChecked);
            }

            array.get(index).setCheck(isChecked);

            notifyDataSetChanged();

        }
    };


    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {


        GroupViewHolder gholder;

        if(convertView==null){
            gholder =  new GroupViewHolder();
            convertView = ginflater.inflate(R.layout.groupsitems,null);

            gholder.groupname = (TextView)convertView.findViewById(R.id.groupnametextview);
            gholder.groupcheckbox = (CheckBox)convertView.findViewById(R.id.groupcheckbox);
            gholder.groupcheckbox.setOnCheckedChangeListener(groupchecklistener);

            convertView.setTag(gholder);

        }else{
            gholder = (GroupViewHolder)convertView.getTag();
        }

        gholder.groupname.setText(array.get(groupPosition).getGroupname());
        gholder.groupname.setTextSize(24);
        gholder.groupname.setTextColor(Color.parseColor("#FF858585"));
        gholder.groupname.setTypeface(Typeface.DEFAULT, Typeface.BOLD);

        int paddingleft = 48;  // 38 dps
        final float scale = getResources().getDisplayMetrics().density;
        int dpvalue = (int) (paddingleft * scale + 0.5f);
        gholder.groupname.setPadding(dpvalue, 16, 0, 16);


        gholder.groupcheckbox.setTag(groupPosition);
        gholder.groupcheckbox.setChecked(array.get(groupPosition).isCheck());

        if(isExpanded == true){
                  convertView.setBackgroundDrawable(getResources().getDrawable(R.drawable.expandedbackground));
        }else{
            convertView.setBackgroundColor(Color.TRANSPARENT);
        }

        return convertView;
    }





    @Override
    public Object getChild(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public Object getGroup(int groupPosition) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getGroupId(int groupPosition) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public boolean hasStableIds() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return false;
    }

}

groupsitems.xml :

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent" >


    <CheckBox
        android:id="@+id/groupcheckbox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="12dp"
        android:focusable="false"
        android:gravity="right|center"
        android:paddingRight="10dp" />

<TextView
android:id="@+id/groupnametextview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_toLeftOf="@+id/groupcheckbox"
android:focusableInTouchMode="false"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#FF858585"
android:textStyle="bold" />

</RelativeLayout>

childitems.xml :

<RelativeLayout
    android:id="@+id/relativeLayout1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginTop="8dp"
    android:paddingLeft="8dp" >


<TextView
        android:id="@+id/childnametextview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@+id/childcheckbox"
        android:gravity="right|center"
        android:paddingLeft="16dp"
        android:textColor="#FFAFAFAF"
        android:textSize="16sp"
        android:textStyle="bold" />

<CheckBox
        android:id="@+id/childcheckbox"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true" />

</RelativeLayout>

Answer 1

I’ve found the solution. Instead of using OnCheckedChangeListener on the groupcheckbox, I used OnClickListener and it solved everything like this :

gholder.groupcheckbox.setChecked(array.get(groupPosition).isCheck());
gholder.groupcheckbox.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                for(int i = 0;i<array.get(groupPosition).getContacts().size();i++){
                    array.get(groupPosition).getContacts().get(i).setCheck(gholder.groupcheckbox.isChecked());
                }

                array.get(groupPosition).setCheck(gholder.groupcheck.isChecked());

                notifyDataSetChanged();
            }
        });