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activity_main.xml
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xml version="1.0" encoding="utf-8"
?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.project.example.customexpendablelistviewdemo.MainActivity">

     <ExpandableListView
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:id="@+id/listViewforSeat">
     </ExpandableListView>
</RelativeLayout>

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List_summary_group.xml
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xml version="1.0" encoding="utf-8"
?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:padding="8dp"
        android:layout_marginRight="5dp"
        android:layout_marginLeft="5dp"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:paddingTop="5dp"
            android:paddingBottom="5dp"
            android:paddingLeft="18dp"
            android:id="@+id/textHeadertype" />

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/textheaderguest_Count"
            android:layout_weight=".5"
            android:paddingLeft="8dp"
            />


    </LinearLayout>

</LinearLayout>

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List_summary_child.xml
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xml version="1.0" encoding="utf-8"
?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#dddddd">

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:padding="4dp"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:id="@+id/textchildtype" />

        <TextView
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:id="@+id/textchildguest_Count" />

        <Button
            android:layout_width="70dp"
            android:layout_height="40dp"

            android:id="@+id/chengeSeatBtn"/>


    </LinearLayout>

</LinearLayout>




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Summarychild.Java
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public class summarychild {
    private String Count;
    private String Ailrline;
    private String GuestType;

    public String getCount() {
        return Count;
    }

    public void setCount(String count) {
        Count = count;
    }

    public String getAilrline() {
        return Ailrline;
    }

    public void setAilrline(String ailrline) {
        Ailrline = ailrline;
    }

    public String getGuestType() {
        return GuestType;
    }

    public void setGuestType(String guestType) {
        GuestType = guestType;
    }



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SummaryGroup.Java
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public class SummaryGroup {
    private String Name;
    private String count;
    private ArrayList Items;

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }

    public String getCount() {
        return count;
    }

    public void setCount(String count) {
        this.count = count;
    }

    public ArrayList getItems() {
        return Items;
    }

    public void setItems(ArrayList items) {
        Items = items;
    }
}

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AdapterForSummarySeat.Java
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public class AdapterForSummarySeat extends BaseExpandableListAdapter {
    private Context context;
    private ArrayList groups;
    private ArrayList arraylist;
    public static int count;
    public static ArrayList AirlineName=new ArrayList<>();

    public AdapterForSummarySeat(Context context, ArrayList groups) {
        this.context = context;
        this.groups = groups;
        this.arraylist=new ArrayList();
        this.arraylist.addAll(groups);
    }

    @Override
    public int getGroupCount() {
        return groups.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        ArrayList summchList = groups.get(groupPosition).getItems();
        return summchList.size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return groups.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        ArrayList chList = groups.get(groupPosition).getItems();
        return chList.get(childPosition);
    }

    @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) {

        SummaryGroup group = (SummaryGroup) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater inf = (LayoutInflater) context
                    .getSystemService(context.LAYOUT_INFLATER_SERVICE);
            convertView = inf.inflate(R.layout.list_summary_group, null);
        }
        TextView  textHeadertype= (TextView) convertView.findViewById(R.id.textHeadertype);
        TextView  textheaderguest_Count= (TextView) convertView.findViewById(R.id.textheaderguest_Count);
        textHeadertype.setText(group.getName());
        textheaderguest_Count.setText(group.getCount());
        return convertView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        final ViewHolder holder;
        final int possition=childPosition;
        final summarychild child = (summarychild) getChild(groupPosition, childPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) context
                    .getSystemService(context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_summary_child, null);
        }
        holder = new ViewHolder();
        try {
            holder.textchildtype = (TextView) convertView.findViewById(R.id.textchildtype);
            holder.textchildguest_Count = (TextView) convertView.findViewById(R.id.textchildguest_Count);
            holder.textchildtype.setText(child.getAilrline());
            holder.textchildguest_Count.setText(child.getCount());
        }catch (Exception e){
            e.printStackTrace();
        }
        return convertView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

    public void filter(String charText) {

        charText = charText.toLowerCase(Locale.getDefault());
        groups.clear();
        if (charText.length() == 0) {
            groups.addAll(arraylist);
        }
        else
        {
            for (SummaryGroup sp : arraylist)
            {
                if (sp.getName().toLowerCase(Locale.getDefault()).contains(charText))
                {
                    groups.add(sp);
                }else if (sp.getCount().toLowerCase(Locale.getDefault()).contains(charText)){
                    groups.add(sp);
                }


        }
    }
    notifyDataSetChanged();
}


static class ViewHolder {

        TextView textchildtype,textchildguest_Count;
    }

}

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MainActivity.Java
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public class MainActivity extends AppCompatActivity {

    public static ArrayList SummaryGroupInfo;
    public static ArrayList Group;
    public static ArrayList SummarychildInfo;
    public static ArrayList childInfo;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        SummaryGroupInfo = new ArrayList();
        SummarychildInfo = new ArrayList();
        Group = new ArrayList<>();

        for (int i = 0; i < 3; i++) {
            SummaryGroup SeatDeatils = new SummaryGroup();
            SeatDeatils.setName("FlightNo " + i);
            SeatDeatils.setCount("STD " + i);
            SummaryGroupInfo.add(SeatDeatils);
        }

        for (int j = 0; j < 3; j++) {
            summarychild child = new summarychild();
            child.setAilrline("Airline " + j);
            child.setCount("Count " + j);
            child.setGuestType("GuestType " + j);
            SummarychildInfo.add(child);
        }

        for (int g = 0; g < SummaryGroupInfo.size(); g++) {
            SummaryGroup Info = new SummaryGroup();
            SummaryGroup setinfo = SummaryGroupInfo.get(g);
            Info.setName(setinfo.getName());
            Info.setCount(setinfo.getCount());
            childInfo = new ArrayList();

            for (int c = 0; c < SummarychildInfo.size(); c++) {
                summarychild childInfos = SummarychildInfo.get(c);
                summarychild addchild = new summarychild();

                addchild.setAilrline(childInfos.getAilrline());
                addchild.setCount(childInfos.getCount());
                childInfo.add(addchild);

            }
            Info.setItems(childInfo);
            Group.add(Info);
        }
        final ExpandableListView list_alert = (ExpandableListView) findViewById(R.id.listViewforSeat);
        final AdapterForSummarySeat adapter = new AdapterForSummarySeat(MainActivity.this, Group);
        list_alert.setAdapter(adapter);
        list_alert.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
            @Override
            public void onGroupExpand(int groupPosition) {
                int len = adapter.getGroupCount();
                for (int i = 0; i < len; i++) {
                    if (i != groupPosition) {
                        list_alert.collapseGroup(i);
                    }
                }
            }
        });
    }
}
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