I am new to android development. I created a listview with textbox and checkbox. When I check the checkbox and scroll it down to check some other items in the list view, the older ones are unchecked. How to avoid this problem in listview? Please guide me with my code. Here is the code:

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">
<TextView android:id="@+id/TextView01" android:layout_height="wrap_content"
    android:text="List of items" android:textStyle="normal|bold"
    android:gravity="center_vertical|center_horizontal"
    android:layout_width="fill_parent"></TextView>
<ListView android:id="@+id/ListView01" android:layout_height="250px"
    android:layout_width="fill_parent">
</ListView>
<Button android:text="Save" android:id="@+id/btnSave"
    android:layout_width="wrap_content" android:layout_height="wrap_content">
</Button>

</LinearLayout>

This is the xml page I used to create dynamic list row:

listview.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content" android:gravity="left|center"
android:layout_width="wrap_content" android:paddingBottom="5px"
android:paddingTop="5px" android:paddingLeft="5px">
<TextView android:id="@+id/TextView01" android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:gravity="center"
    android:textColor="#FFFF00" android:text="hi"></TextView>
<TextView android:text="hello" android:id="@+id/TextView02"
    android:layout_width="wrap_content" android:layout_height="wrap_content"
    android:layout_marginLeft="10px" android:textColor="#0099CC"></TextView>
<EditText android:id="@+id/txtbox" android:layout_width="120px"
    android:layout_height="wrap_content" android:textSize="12sp"
    android:layout_x="211px" android:layout_y="13px">
</EditText>
<CheckBox android:id="@+id/chkbox1" android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
</LinearLayout>

This is my activity class.

CustomListViewActivity.java:

package com.listivew;

import android.app.Activity;
import android.os.Bundle;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class CustomListViewActivity extends Activity {
ListView lstView;
static Context mContext;
Button btnSave;
private static class EfficientAdapter extends BaseAdapter {
private LayoutInflater mInflater;

public EfficientAdapter(Context context) {
    mInflater = LayoutInflater.from(context);

}

public int getCount() {
    return country.length;
}

public Object getItem(int position) {
    return position;
}

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

public View getView(int position, View convertView, ViewGroup parent) {
    final ViewHolder holder;
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.listview, parent,
                false);
        holder = new ViewHolder();
        holder.text = (TextView) convertView
                .findViewById(R.id.TextView01);
        holder.text2 = (TextView) convertView
                .findViewById(R.id.TextView02);
        holder.txt = (EditText) convertView.findViewById(R.id.txtbox);
        holder.cbox = (CheckBox) convertView.findViewById(R.id.chkbox1);

        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.text.setText(curr[position]);
    holder.text2.setText(country[position]);
    holder.txt.setText("");
    holder.cbox.setChecked(false);

    return convertView;
}

public class ViewHolder {
    TextView text;
    TextView text2;
    EditText txt;
    CheckBox cbox;
}
}

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
lstView = (ListView) findViewById(R.id.ListView01);
lstView.setAdapter(new EfficientAdapter(this));
btnSave = (Button)findViewById(R.id.btnSave);
mContext = this;

btnSave.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // I want to print the text which is in the listview one by one. 
        //Later i will insert it in the database
//            Toast.makeText(getBaseContext(), "EditText Value, checkbox value and other values", Toast.LENGTH_SHORT).show();
        for (int i = 0; i < lstView.getCount(); i++) {
            View listOrderView;
            listOrderView = lstView.getChildAt(i);
            try{
                EditText txtAmt = (EditText)listOrderView.findViewById(R.id.txtbox);
                CheckBox cbValue = (CheckBox)listOrderView.findViewById(R.id.chkbox1);
                if(cbValue.isChecked()== true){
                    String amt = txtAmt.getText().toString();
                    Toast.makeText(getBaseContext(), "Amount is :"+amt, Toast.LENGTH_SHORT).show();
                }

            }catch (Exception e) {
                // TODO: handle exception
            }
        }

    }
});
}

private static final String[] country = { "item1", "item2", "item3",
    "item4", "item5", "item6","item7", "item8", "item9",
    "item10", "item11", "item12" };
private static final String[] curr = { "1", "2", "3", "4", "5", "6","7", "8", "9", "10", "11", "12" };

}

Please help me to slove this problem. I have referred in many places. But I could not get proper answer to solve this problem. Please provide me the code to avoid unchecking the checkbox while scrolling up and down.

Thank you.