Custom ListView with CheckBox

Hi, Layout: main.xml

<Relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <Button
        android:id="@+id/main_btn_data"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignparentbottom="true"
        android:layout_alignparentleft="true"
        android:onclick="onClickData"
        android:text="@string/hello" />
    <Listview
        android:id="@+id/listView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/main_btn_data"
        android:layout_alignparentleft="true"
        android:layout_alignparenttop="true" />
</Relativelayout>

<Relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <Textview
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignbaseline="@+id/checkBox1"
        android:layout_alignbottom="@+id/checkBox1"
        android:layout_alignparentleft="true"
        android:text="TextView"
        android:textappearance="?android:attr/textAppearanceLarge" />

    <Checkbox
        android:id="@+id/checkBox1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignparentright="true"
        android:layout_alignparenttop="true" />

</Relativelayout>

MultipleCheckerActivity.java

public class MultipleCheckerActivity extends Activity {
 
 private ListView list;
 private List employee;
 private EmployeeAdapter adapter;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        employee = new ArrayList();
        fillData("Nishant", "Shah", 25, false);
        fillData("Chirag", "Shah", 22, false);
        fillData("Utsav", "Kapuriya", 22, false);
        
        list = (ListView) findViewById(R.id.listView1);
        adapter = new EmployeeAdapter(getApplicationContext(), R.layout.row_main, employee);
        list.setAdapter(adapter);
    }
    
    private void fillData ( String name, String lastName, int age, boolean isSelected ) {
     final EmployeeModel model = new EmployeeModel();
     model.setName(name);
     model.setLastName(lastName);
     model.setAge(age);
     model.setSelected(isSelected);
     
     employee.add(model);
    }
    
    public void onClickData ( View view ) {
     List empData = adapter.employeeData;
     System.out.println("Total Size :"  + empData.size());
     
     for (EmployeeModel employeeModel : empData) {
   if ( employeeModel.isSelected() ) {
    Log.e("Checker", employeeModel.getName());
   }
  }
    }
}

EmployeeAdapter.java

public class EmployeeAdapter extends BaseAdapter {
 
 public List employeeData;
 private Context mContext;
 private LayoutInflater mInflater;
 
 public EmployeeAdapter(Context context, int textViewResourceId,
   List objects) {
  this.employeeData = objects;
  this.mContext = context;
  mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
 }
 
 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder holder;
  
  if (convertView == null) {
   holder = new ViewHolder();
   
   convertView = mInflater.inflate(R.layout.row_main, null);
   
   holder.txtName = (TextView) convertView.findViewById(R.id.textView1);
   holder.chkTick = (CheckBox) convertView.findViewById(R.id.checkBox1);
   
   convertView.setTag(holder);
  } else {
   holder = (ViewHolder) convertView.getTag();
  }
  
  final int pos = position;
  holder.txtName.setText(employeeData.get(position).getName() + " " + 
    employeeData.get(position).getLastName());
  holder.chkTick.setOnCheckedChangeListener(new OnCheckedChangeListener() {
   public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    employeeData.get(pos).setSelected(isChecked);
   }
  });
  
  return convertView;
 }
 
 static class ViewHolder {
  TextView txtName;
  CheckBox chkTick;
 }

 public int getCount() {
  return employeeData.size();
 }

 public EmployeeModel getItem(int position) {
  return employeeData.get(position);
 }

 public long getItemId(int position) {
  return 0;
 }
}

EmployeeModel.java

public class EmployeeModel {

 private String name;
 private int age;
 private String lastName;
 private boolean selected;

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public int getAge() {
  return age;
 }

 public void setAge(int age) {
  this.age = age;
 }

 public String getLastName() {
  return lastName;
 }

 public void setLastName(String lastName) {
  this.lastName = lastName;
 }

 public boolean isSelected() {
  return selected;
 }

 public void setSelected(boolean selected) {
  this.selected = selected;
 }
}