ExpandableListView, delete a sub-child

package aexp.elistcbox;

import android.app.ExpandableListActivity;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.CheckBox;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;
import android.widget.TextView;
import android.widget.Toast;

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





import android.util.Log;

public class ElistCBox extends ExpandableListActivity
{
    private static final String LOG_TAG = "ElistCBox";

    static final String colors[] = {
	  "Grey",
	  "Blue",
	  "Yellow",
	  "Red"
	};

	static final String shades[][] = {
// Shades of grey
	  {
		"lightgrey","#D3D3D3",
		"dimgray","#696969",
		"sgi gray 92","#EAEAEA"
	  },
// Shades of blue
	  {
		"dodgerblue 2","#1C86EE",
		"steelblue 2","#5CACEE",
		"powderblue","#B0E0E6"
	  },
// Shades of yellow
	  {
		"yellow 1","#FFFF00",
		"gold 1","#FFD700",
		"darkgoldenrod 1","	#FFB90F"
	  },
// Shades of red
	  {
		"indianred 1","#FF6A6A",
		"firebrick 1","#FF3030",
		"maroon","#800000"
	  }
    };
	 CustomExpandableListView expListAdapter;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle)
    {
        super.onCreate(icicle);
       // setGroupIndicator(null);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
        WindowManager.LayoutParams.FLAG_FULLSCREEN);
        final LayoutInflater layoutInflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        setContentView(R.layout.main);
	
        expListAdapter=new CustomExpandableListView(
				this,
				createGroupList(),	// groupData describes the first-level entries
				R.layout.group_row,	// Layout for the first-level entries
				null,	// Key in the groupData maps to display
				new int[] {},		// Data under "colorName" key goes into this TextView
				createChildList(),	// childData describes second-level entries
				 0,
	                null,
	                new int[] {}
			);
		setListAdapter(expListAdapter );
    }

    public void  onContentChanged  () {
        super.onContentChanged();
        Log.d( LOG_TAG, "onContentChanged" );
    }
    public void onGroupCollapse(int groupPosition)
    {
    	
    	Toast.makeText(getBaseContext(), "collapsed groupPosition= "+groupPosition, Toast.LENGTH_SHORT).show();    	
    }
    
    public boolean onChildClick(
            ExpandableListView parent, 
            View v, 
            int groupPosition,
            int childPosition,
            long id) {
    	Toast.makeText(getBaseContext(), "onChildClick groupPosition= "+groupPosition+" childPosition="+childPosition, Toast.LENGTH_SHORT).show();
    	expListAdapter.removeChild(groupPosition, childPosition,v,parent);
        Log.d( LOG_TAG, "onChildClick: "+childPosition );
       // v.setVisibility(View.GONE);
        

        if(v==null)
        	Toast.makeText(getBaseContext(), "gone= "+childPosition, Toast.LENGTH_SHORT).show();
        else
        {
        	Toast.makeText(getBaseContext(), "not gone= "+childPosition, Toast.LENGTH_SHORT).show();
	        	
	     /*   CheckBox cb = (CheckBox)v.findViewById( R.id.check1 );
	        if( cb != null )
	            cb.toggle();*/
        }
        return false;
    }
    public void  onGroupExpand  (int groupPosition) {
    	Toast.makeText(getBaseContext(), "expand groupPosition= "+groupPosition, Toast.LENGTH_SHORT).show();
        Log.d( LOG_TAG,"onGroupExpand: "+groupPosition );
    }

/**
  * Creates the group list out of the colors[] array according to
  * the structure required by SimpleExpandableListAdapter. The resulting
  * List contains Maps. Each Map contains one entry with key "colorName" and
  * value of an entry in the colors[] array.
  */
	private List createGroupList() {
	  ArrayList result = new ArrayList();
	  for( int i = 0 ; i < colors.length ; ++i ) {
		HashMap m = new HashMap();
		 Drawable photo= (Drawable) this.getResources().getDrawable(R.drawable.ic_launcher);
	    m.put( "colorName",colors[i] );
	    m.put("img1",photo);
		result.add( m );
	  }
	  return (List)result;
    }

/**
  * Creates the child list out of the shades[] array according to the
  * structure required by SimpleExpandableListAdapter. The resulting List
  * contains one list for each group. Each such second-level group contains
  * Maps. Each such Map contains two keys: "shadeName" is the name of the
  * shade and "rgb" is the RGB value for the shade.
  */
  private List createChildList() {
	ArrayList result = new ArrayList();
	for( int i = 0 ; i < shades.length ; ++i ) {
// Second-level lists
	  ArrayList secList = new ArrayList();
	  for( int n = 0 ; n < shades[i].length ; n += 2 ) {
	    HashMap child = new HashMap();
	    Drawable photo= (Drawable) this.getResources().getDrawable(R.drawable.ic_launcher);
		child.put( "shadeName", shades[i][n] );
	    child.put( "rgb", shades[i][n+1] );
	    child.put("img",photo );
	    child.put("check1","true" );
		secList.add( child );
	  }
	  result.add( secList );
	}
	return result;
  }

}

package aexp.elistcbox;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.SimpleExpandableListAdapter;
import android.widget.TextView;
//http://stackoverflow.com/questions/7700223/how-to-delete-elements-from-a-list-in-android
//http://stackoverflow.com/questions/5188196/how-to-write-custom-expandablelistadapter
public class CustomExpandableListView extends SimpleExpandableListAdapter {

    final LayoutInflater layoutInflater ;
    List <? extends Map<String, ?>> grp;
    List <? extends List<? extends Map<String, ?>>> child;
    View v;


    public CustomExpandableListView(Context context,
            List<? extends Map<String, ?>> groupData, int expandedGroupLayout,
            int collapsedGroupLayout, String[] groupFrom, int[] groupTo,
            List<? extends List<? extends Map<String, ?>>> childData,
            int childLayout, String[] childFrom, int[] childTo) {
        super(context, groupData, expandedGroupLayout, collapsedGroupLayout, groupFrom,
                groupTo, childData, childLayout, childFrom, childTo);
        grp=groupData;
        child=childData;
        layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        // TODO Auto-generated constructor stub
    }



    public CustomExpandableListView(Context context,
            List<? extends Map<String, ?>> groupData, int groupLayout,
            String[] groupFrom, int[] groupTo,
            List<? extends List<? extends Map<String, ?>>> childData,
            int childLayout, String[] childFrom, int[] childTo) {
        super(context, groupData, groupLayout, groupFrom, groupTo, childData,
                childLayout, childFrom, childTo);
        layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        // TODO Auto-generated constructor stub
    }



    public CustomExpandableListView(Context context,
            List<? extends Map<String, ?>> groupData, int expandedGroupLayout,
            int collapsedGroupLayout, String[] groupFrom, int[] groupTo,
            List<? extends List<? extends Map<String, ?>>> childData,
            int childLayout, int lastChildLayout, String[] childFrom,
            int[] childTo) {
        super(context, groupData, expandedGroupLayout, collapsedGroupLayout, groupFrom,
                groupTo, childData, childLayout, lastChildLayout, childFrom, childTo);
        layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        // TODO Auto-generated constructor stub
    }



         @Override
           public View newGroupView(boolean isExpanded, ViewGroup parent){
                return layoutInflater.inflate(R.layout.group_row, null, false);
           }
        @Override
       public View getGroupView(int groupPosition,boolean isExpanded,View convertView,ViewGroup parent)
       {
            // final View v = super.getGroupView(groupPosition, isExpanded, convertView, parent);

             View v = null;
                if( convertView != null )
                    v = convertView;
                else
                    v = layoutInflater.inflate(R.layout.group_row, parent, false);

               // Populate your custom view here
               ((TextView)v.findViewById(R.id.childname1)).setText((String) ((Map<String,Object>)getGroup(groupPosition)).get("colorName")  );
               ((ImageView)v.findViewById(R.id.test_image1)).setImageDrawable( (Drawable) ((Map<String,Object>)getGroup(groupPosition)).get("img1") );

                           return v;
            // return layoutInflater.inflate(R.layout.group_row, null, false);
       }

        @SuppressWarnings("unchecked")
        public void removeChild(int groupPosition, int childPosition,View v,ExpandableListView parent )
        {


        //HERE IS MY PROBLEM
            //Its not deleting the whole child view only one checkbox is still staying in all the child.
            ((Map<String,Object>)getChild(groupPosition, childPosition)).clear();
            notifyDataSetChanged();
            //HERE IS MY PROBLEM
            }

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

           View v = null;
            if( convertView != null )
                v = convertView;
            else
                v = layoutInflater.inflate(R.layout.child_row, parent, false);



           // Populate your custom view here
           ((TextView)v.findViewById(R.id.childname)).setText( (String) ((Map<String,Object>)getChild(groupPosition, childPosition)).get("shadeName") );
           ((TextView)v.findViewById(R.id.rgb)).setText( (String) ((Map<String,Object>)getChild(groupPosition, childPosition)).get("rgb") );
           ((ImageView)v.findViewById(R.id.test_image)).setImageDrawable( (Drawable) ((Map<String,Object>)getChild(groupPosition, childPosition)).get("img") );
           String str=(String) ((Map<String,Object>)getChild(groupPosition, childPosition)).get("check1");
           if(str=="true")
               ((CheckBox)v.findViewById(R.id.check1)).setChecked( true);
           else if(str=="false")
           ((CheckBox)v.findViewById(R.id.check1)).setChecked( false);
           //else
             //  v.invalidate();


           return v;
       }

       @Override
       public View newChildView(boolean isLastChild, ViewGroup parent) {
            return layoutInflater.inflate(R.layout.child_row, null, false);
       }
   }