3개 길이의 ExpandableListView

The below snippet helps to implement three level list in android.
First Group
--Sub Group
   ---   Child1
   ---   Child 2
   ---   Child 3
in this pattern.....
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
  
    <ExpandableListView
     android:layout_width="fill_parent"
     android:id="@+id/ParentLevel"
     android:groupIndicator="@null"
     android:layout_height="fill_parent">
    </ExpandableListView>

</LinearLayout>

Home.java

package com.threeelevellist.activities;

import android.app.Activity;

import android.content.Context;

import android.graphics.Color;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseExpandableListAdapter;

import android.widget.ExpandableListView;

import android.widget.ListView;

import android.widget.TextView;

import android.widget.LinearLayout.LayoutParams;

public class Home extends Activity 

{

    ExpandableListView explvlist;

    @Override

    public void onCreate(Bundle savedInstanceState) 

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        

        explvlist = (ExpandableListView)findViewById(R.id.ParentLevel);

        explvlist.setAdapter(new ParentLevel());

        

    }

    

    public class ParentLevel extends BaseExpandableListAdapter

    {

@Override

public Object getChild(int arg0, int arg1) 

{

return arg1;

}

@Override

public long getChildId(int groupPosition, int childPosition) 

{

return childPosition;

}

@Override

public View getChildView(int groupPosition, int childPosition,

boolean isLastChild, View convertView, ViewGroup parent) 

{

CustExpListview SecondLevelexplv = new CustExpListview(Home.this);

SecondLevelexplv.setAdapter(new SecondLevelAdapter());

SecondLevelexplv.setGroupIndicator(null);

return SecondLevelexplv;

}

@Override

public int getChildrenCount(int groupPosition) 

{

return 3;

}

@Override

public Object getGroup(int groupPosition) 

{

return groupPosition;

}

@Override

public int getGroupCount() 

{

return 5;

}

@Override

public long getGroupId(int groupPosition) 

{

return groupPosition;

}

@Override

public View getGroupView(int groupPosition, boolean isExpanded,

View convertView, ViewGroup parent) 

{

TextView tv = new TextView(Home.this);

tv.setText("->FirstLevel");

tv.setBackgroundColor(Color.BLUE);

tv.setPadding(10, 7, 7, 7);

return tv;

}

@Override

public boolean hasStableIds() 

{

return true;

}

@Override

public boolean isChildSelectable(int groupPosition, int childPosition) 

{

return true;

}    

    }

    

    public class CustExpListview extends ExpandableListView

    {

int intGroupPosition, intChildPosition, intGroupid;

public CustExpListview(Context context) 

{

super(context);

}

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 

{

widthMeasureSpec = MeasureSpec.makeMeasureSpec(960, MeasureSpec.AT_MOST);

heightMeasureSpec = MeasureSpec.makeMeasureSpec(600, MeasureSpec.AT_MOST);

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

}

    }

    

    public class SecondLevelAdapter extends BaseExpandableListAdapter

    {

@Override

public Object getChild(int groupPosition, int childPosition) 

{

return 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) 

{

TextView tv = new TextView(Home.this);

tv.setText("child");

tv.setPadding(15, 5, 5, 5);

tv.setBackgroundColor(Color.YELLOW);

tv.setLayoutParams(new ListView.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));

return tv;

}

@Override

public int getChildrenCount(int groupPosition) 

{

return 5;

}

@Override

public Object getGroup(int groupPosition) 

{

return groupPosition;

}

@Override

public int getGroupCount() 

{

return 1;

}

@Override

public long getGroupId(int groupPosition) 

{

return groupPosition;

}

@Override

public View getGroupView(int groupPosition, boolean isExpanded,

View convertView, ViewGroup parent) 

{

TextView tv = new TextView(Home.this);

tv.setText("-->Second Level");

tv.setPadding(12, 7, 7, 7);

tv.setBackgroundColor(Color.RED);

return tv;

}

@Override

public boolean hasStableIds() {

// TODO Auto-generated method stub

return true;

}

@Override

public boolean isChildSelectable(int groupPosition, int childPosition) {

// TODO Auto-generated method stub

return true;

}

    

    }

}