Android Expandable ListView

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activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_height="match_parent"

    android:layout_width="wrap_content"

    android:paddingLeft="16dp"

    android:paddingRight="16dp"

    android:paddingTop="16dp"

    android:paddingBottom="16dp"

    >

<ExpandableListView

    android:id="@+id/exp_list"

    android:layout_height="match_parent"

   android:layout_width="match_parent"

  android:indicatorLeft="?android:attr/expandableListPreferredItemIndicatorLeft"

    android:divider="#A4C739"

    android:dividerHeight="0.5dp"

     ></ExpandableListView>

    </RelativeLayout>

parent_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
   >
   <TextView
    android:id="@+id/parent_txt"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft"
    android:textColor="#A4C739"
    android:paddingTop="10dp"
    android:paddingBottom="10dp"
    />
 
    </LinearLayout>

child_layout.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:orientation="vertical"
     >
    <TextView
        android:id="@+id/child_txt"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft"
        android:paddingTop="10dp"
        android:paddingBottom="10dp"
        />

    </LinearLayout>

MainActivity.java

package com.easyway2in;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import android.app.Activity;

import android.os.Bundle;

import android.widget.ExpandableListView;

public class MainActivity extends Activity {

HashMap<String, List<String>> Movies_category;

List<String> Movies_list;

ExpandableListView Exp_list;

MoviesAdapter adapter;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Exp_list = (ExpandableListView) findViewById(R.id.exp_list);

        Movies_category = DataProvider.getInfo();

        Movies_list = new ArrayList<String>(Movies_category.keySet());

        adapter = new MoviesAdapter(this, Movies_category, Movies_list);

        Exp_list.setAdapter(adapter);

    }

}

MoviesAdapter.java

package com.easyway2in;

import java.util.HashMap;

import java.util.List;

import android.content.Context;

import android.graphics.Typeface;

import android.util.MonthDisplayHelper;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseExpandableListAdapter;

import android.widget.TextView;

public class MoviesAdapter extends BaseExpandableListAdapter{

private Context ctx;

private HashMap<String, List<String>> Movies_Category;

private List<String> Movies_List;

public MoviesAdapter(Context ctx, HashMap<String, List<String>> Movies_Category, List<String> Movies_List )

{

this.ctx = ctx;

this.Movies_Category = Movies_Category;

this.Movies_List = Movies_List;

}

@Override

public Object getChild(int parent, int child) {

return Movies_Category.get(Movies_List.get(parent)).get(child);

}

@Override

public long getChildId(int parent, int child) {

// TODO Auto-generated method stub

return child;

}

@Override

public View getChildView(int parent, int child, boolean lastChild, View convertview,

ViewGroup parentview) 

{

String child_title =  (String) getChild(parent, child);

if(convertview == null)

{

LayoutInflater inflator = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

   convertview = inflator.inflate(R.layout.child_layout, parentview,false);

}

TextView child_textview = (TextView) convertview.findViewById(R.id.child_txt);

child_textview.setText(child_title);

return convertview;

}

@Override

public int getChildrenCount(int arg0) {

return Movies_Category.get(Movies_List.get(arg0)).size();

}

@Override

public Object getGroup(int arg0) {

// TODO Auto-generated method stub

return Movies_List.get(arg0);

}

@Override

public int getGroupCount() {

// TODO Auto-generated method stub

return Movies_List.size();

}

@Override

public long getGroupId(int arg0) {

// TODO Auto-generated method stub

return arg0;

}

@Override

public View getGroupView(int parent, boolean isExpanded, View convertview, ViewGroup parentview) {

// TODO Auto-generated method stub

String group_title = (String) getGroup(parent);

if(convertview == null)

{

LayoutInflater inflator = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

   convertview = inflator.inflate(R.layout.parent_layout, parentview,false);

}

TextView parent_textview = (TextView) convertview.findViewById(R.id.parent_txt);

parent_textview.setTypeface(null, Typeface.BOLD);

parent_textview.setText(group_title);

return convertview;

}

@Override

public boolean hasStableIds() {

// TODO Auto-generated method stub

return false;

}

@Override

public boolean isChildSelectable(int arg0, int arg1) {

// TODO Auto-generated method stub

return false;

}

}

DataProvider.java

package com.easyway2in;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

public class DataProvider {

public static HashMap<String, List<String>> getInfo()

{

HashMap<String, List<String>> MoviesDetails = new HashMap<String, List<String>>();

List<String> Action_Movies = new ArrayList<String>();

Action_Movies.add("300 Rise of an Empire");

Action_Movies.add("Robocop");

Action_Movies.add("The Hunger Games");

Action_Movies.add("The Expendables 3");

Action_Movies.add("Guardian of the Galaxy");

List<String> Romntic_Movies = new ArrayList<String>();

Romntic_Movies.add("Mean Girls");

Romntic_Movies.add("Failure To Launch");

Romntic_Movies.add("The House Bunny");

Romntic_Movies.add("Ghost of Girlfriends Past");

Romntic_Movies.add("The Devil Wears Prada");

List<String> Horror_Movies= new ArrayList<String>();

Horror_Movies.add("The Conjuring");

Horror_Movies.add("Drag Me to Hell");

Horror_Movies.add("Sinister");

Horror_Movies.add("Sleepy Hollow");

Horror_Movies.add("Eden lake");

List<String> Comedy_Movies = new ArrayList<String>();

Comedy_Movies.add("Ride Along");

Comedy_Movies.add("That Awkward Moment");

Comedy_Movies.add("Wish I Was Here");

Comedy_Movies.add("About last Night");

Comedy_Movies.add("This is the End");

MoviesDetails.put("Action Movies", Action_Movies);

MoviesDetails.put("Romantic Movies", Romntic_Movies);

MoviesDetails.put("Horror Movies", Horror_Movies);

MoviesDetails.put("Comedy Movies", Comedy_Movies);

return MoviesDetails;

}

}