Android: Several Radio button in custom list view

package com.radiobutton.listview;


import java.util.ArrayList;

import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class Adaptersoal extends ArrayAdapter<Structsoal>{
	
	
	public Adaptersoal(ArrayList<Structsoal> array) {
		super(G.context, R.layout.adapter_soal,array);
		
		
		
		
	}
	
	public static class ViewHolder {
		public TextView txt_soal;
		public ViewGroup btn_soal; 
		public RadioButton gozine1;
		public RadioButton gozine2;
		public RadioButton gozine3;
		public RadioButton gozine4;
		public RadioGroup rdb_go;

		public ViewHolder (View view) {
			txt_soal = (TextView) view.findViewById (R.id.txt_soal);
			txt_soal.setTypeface(G.tf);
			txt_soal.setTextSize(18);
			gozine1 = (RadioButton) view.findViewById(R.id.gozine1);
			gozine2 = (RadioButton) view.findViewById(R.id.gozine2);
			gozine3 = (RadioButton) view.findViewById(R.id.gozine3);
			gozine4 = (RadioButton) view.findViewById(R.id.gozine4);
			rdb_go = (RadioGroup) view.findViewById(R.id.rdb_g);
			btn_soal =  (ViewGroup) view.findViewById(R.id.btn_soal);
		}
		public void fill(ArrayAdapter<Structsoal> adapter, final Structsoal itemsoal,int position) {
			
			txt_soal.setText(itemsoal.s_soal);
			gozine1.setText(itemsoal.s_gozine1);
			gozine2.setText(itemsoal.s_gozine2);
			gozine3.setText(itemsoal.s_gozine3);
			gozine4.setText(itemsoal.s_gozine4);
		}
	}
	@Override
	public View getView(int position, View convertViewsoal, ViewGroup parent) {
		ViewHolder holder;
		Structsoal itemsoal = getItem(position);
		if(convertViewsoal==null) {
			convertViewsoal = G.inflater.inflate(R.layout.adapter_soal,parent,false);
			holder = new ViewHolder(convertViewsoal);
			convertViewsoal.setTag(holder);
		}else {
			
			holder = (ViewHolder) convertViewsoal.getTag(); 
		}
		holder.fill(this, itemsoal, position);
		return convertViewsoal;
	}
}