ExpandableLists in Android, I want to allow only one parent list to expand at a time

Question

I want to make only one item in the parent list expand at a time, my code for the onCreate is currently the following. (It works as I want, But the method to allow only one pare

Answer 1

Its Working See Screen Shots

package com.keshav.myexpandablelistviewexampleworkinginactivity;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class MainActivity extends Activity {

    ExpandableListAdapter listAdapter;
    ExpandableListView expListView;
    List listDataHeader;
    HashMap> listDataChild;

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

        // tODO get the listview
        expListView = (ExpandableListView) findViewById(R.id.lvExp);

        // TODO preparing list data
        prepareListData();

        listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);

        // setting list adapter
        expListView.setAdapter(listAdapter);

        // Listview Group click listener
        expListView.setOnGroupClickListener(new OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                                        int groupPosition, long id) {
                Toast.makeText(getApplicationContext(),
                        "Group Clicked " + listDataHeader.get(groupPosition),
                        Toast.LENGTH_SHORT).show();
                return false;
            }

        });

        // Listview Group expanded listener
        expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

            // TODO Colapse Here Using this... in android
            int previousGroup = -1;
            boolean flag = false;

            @Override
            public void onGroupExpand(int groupPosition) {

                Log.e("keshav", "onGroupClick is -> " + groupPosition);

                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Expanded",
                        Toast.LENGTH_SHORT).show();

                if (groupPosition != previousGroup && flag) {
                    expListView.collapseGroup(previousGroup);
                }
                previousGroup = groupPosition;

                flag = true;

            }
        });


        // Listview Group collasped listener
        expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {

            @Override
            public void onGroupCollapse(int groupPosition) {
                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Collapsed",
                        Toast.LENGTH_SHORT).show();

            }
        });


        // Todo Listview on child click listener
        expListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                                        int groupPosition, int childPosition, long id) {
                // TODO Auto-generated method stub
                Toast.makeText(
                        getApplicationContext(),
                        listDataHeader.get(groupPosition)
                                + " : "
                                + listDataChild.get(
                                listDataHeader.get(groupPosition)).get(
                                childPosition), Toast.LENGTH_SHORT)
                        .show();
                return false;
            }
        });
    }

    /*
     * Preparing the list data
     */
    private void prepareListData() {
        listDataHeader = new ArrayList();
        listDataChild = new HashMap>();

        // Adding child data
        listDataHeader.add("Months");
        listDataHeader.add("Top 250");
        listDataHeader.add("Now Showing");
        listDataHeader.add("Coming Soon..");


        // Adding child data
        List weeks = new ArrayList();
        weeks.add("Sunday");
        weeks.add("Monday");
        weeks.add("Tuesday");
        weeks.add("Wednesday");
        weeks.add("Thursday");
        weeks.add("Friday");
        weeks.add("Saturday");


        // Adding child data
        List top250 = new ArrayList();
        top250.add("Om Shanti Om");
        top250.add("Badshah");
        top250.add("Bahubali Part 1");
        top250.add("Carry on Jatta");
        top250.add("Sholey");
        top250.add("Mard");
        top250.add("Dewwar");


        List nowShowing = new ArrayList();
        nowShowing.add("Bahubali");
        nowShowing.add("Kabali");
        nowShowing.add("Luckky Di Unlukky Story");
        nowShowing.add("Sachin Billions Dream");
        nowShowing.add("Red 2");

        List comingSoon = new ArrayList();
        comingSoon.add("Tubelight ");
        comingSoon.add("Bahubali 3 2018");
        comingSoon.add("Dhoom 4");
        comingSoon.add("Hindi Medium");

        listDataChild.put(listDataHeader.get(0), weeks);
        listDataChild.put(listDataHeader.get(1), top250); // Header, Child data
        listDataChild.put(listDataHeader.get(2), nowShowing);
        listDataChild.put(listDataHeader.get(3), comingSoon);
    }
}


ExpandableListAdapter


package com.keshav.myexpandablelistviewexampleworkinginactivity;

import java.util.HashMap;
import java.util.List;

import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class ExpandableListAdapter extends BaseExpandableListAdapter {

    private Context _context;
    private List _listDataHeader; // header titles
    // child data in format of header title, child title
    private HashMap> _listDataChild;

    public ExpandableListAdapter(Context context, List listDataHeader,
            HashMap> listChildData) {
        this._context = context;
        this._listDataHeader = listDataHeader;
        this._listDataChild = listChildData;
    }

    @Override
    public Object getChild(int groupPosition, int childPosititon) {
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .get(childPosititon);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

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

        final String childText = (String) getChild(groupPosition, childPosition);

        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_item, null);
        }

        TextView txtListChild = (TextView) convertView
                .findViewById(R.id.lblListItem);

        txtListChild.setText(childText);
        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .size();
    }

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

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

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

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        String headerTitle = (String) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_group, null);
        }

        TextView lblListHeader = (TextView) convertView
                .findViewById(R.id.lblListHeader);
        lblListHeader.setTypeface(null, Typeface.BOLD);
        lblListHeader.setText(headerTitle);

        return convertView;
    }

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

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

}


activity_mail.xml




               




list_grou.xml





    




list_item.xml