Exp List view

package com.expList;

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.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ExpList extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ExpandableListAdapter mAdapter;
        ExpandableListView epView = (ExpandableListView) findViewById(R.id.ExpandableListView01);
        mAdapter = new ExampleAdapter(this);
        epView.setAdapter(mAdapter);

        //setListAdapter(new ExampleAdapter(this));
    }

    private class ExampleAdapter extends BaseExpandableListAdapter {
        private Context context;
        public ExampleAdapter(Context context) {
            this.context = context;
        }

        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return null;
        }
        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return 0;
        }

        /**
         *  getChildView overridden method will have responsibility of
         *  constructing View for the child element when corresponding
         *  group element is activated by click / touch action.
         */

        @Override
        public View getChildView(int groupPosition, int childPosition,
                boolean isLastChild, View convertView, ViewGroup parent) {
            LinearLayout linear = new LinearLayout(this.context);
            ImageView imView1 = null;
            ImageView imView2 = null;
            ImageView imView3 = null;
            ImageView imView4 = null;

            if(groupPosition == 0) {
                imView1 = new ImageView(this.context);
                imView1.setImageResource(R.drawable.icon);
                imView2 = new ImageView(this.context);
                imView2.setImageResource(R.drawable.icon);
                imView3 = new ImageView(this.context);
                imView3.setImageResource(R.drawable.icon);
                imView4 = new ImageView(this.context);
                imView4.setImageResource(R.drawable.icon);

                linear.addView(imView1);
                linear.addView(imView2);
                linear.addView(imView3);
                linear.addView(imView4);
            }

            if(groupPosition == 1) {
                imView1 = new ImageView(this.context);
                imView1.setImageResource(R.drawable.icon);
                imView2 = new ImageView(this.context);
                imView2.setImageResource(R.drawable.icon);
                imView3 = new ImageView(this.context);
                imView3.setImageResource(R.drawable.icon);
                imView4 = new ImageView(this.context);
                imView4.setImageResource(R.drawable.icon);

                linear.addView(imView1);
                linear.addView(imView2);
                linear.addView(imView3);
                linear.addView(imView4);
            }
            return linear;
        }
        @Override
        public int getChildrenCount(int groupPosition) {
            return 1;
        }
        @Override
        public Object getGroup(int groupPosition) {
            return null;
        }
        @Override
        public int getGroupCount() {
            return 2;
        }

        @Override
        public long getGroupId(int groupPosition) {
            return 0;
        }

        @Override
        public View getGroupView(int groupPosition, boolean isExpanded,
                View convertView, ViewGroup parent) {
            LinearLayout linear = new LinearLayout(this.context);
            ImageView imView = null;
            if(groupPosition == 0) {
                TextView txtView = new TextView(this.context);
                txtView.setText("Cup Board :");
                txtView.setTextColor(Color.BLACK);
                linear.addView(txtView);
                imView = new ImageView(this.context);
                imView.setImageResource(R.drawable.icon);
                linear.addView(imView);
            }
            if(groupPosition == 1) {
                TextView txtView = new TextView(this.context);
                txtView.setText("Cameras :");
                txtView.setTextColor(Color.BLACK);
                linear.addView(txtView);
                imView = new ImageView(this.context);
                imView.setImageResource(R.drawable.icon);
                linear.addView(imView);
            }
            return linear;
        }
        @Override
        public boolean hasStableIds() {
            return false;
        }
        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }
    }
}