Android: Need to save checkbox state in a custom adapter listview

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Java

Mobile

Android

I need to be able to save the state of the checkboxes. When the app the closes, it should save which checkboxes were checked and when the app comes back on, the checkboxes that were checked should be checked at startup. It uses a custom adapter listview. Thank You for your time.

Main Activity

public class MainActivity extends Activity {

MyCustomAdapter dataAdapter = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //Generate list View from ArrayList
    displayListView();

}



private void displayListView() {

    //Array list of countries
    ArrayList<Country> countryList = new ArrayList<Country>();
    Country country = new Country("","Challenge 1",false);
    countryList.add(country);
    country = new Country("ALB","Albania",false);
    countryList.add(country);
    country = new Country("DZA","Algeria",false);
    countryList.add(country);
    country = new Country("ASM","American Samoa",false);
    countryList.add(country);
    country = new Country("AND","Andorra",false);
    countryList.add(country);
    country = new Country("AGO","Angola",false);
    countryList.add(country);
    country = new Country("AIA","Anguilla",false);
    countryList.add(country);

    //create an ArrayAdaptar from the String Array
    dataAdapter = new MyCustomAdapter(this,
            R.layout.country_info, countryList);
    ListView listView = (ListView) findViewById(R.id.listView1);
    // Assign adapter to ListView
    listView.setAdapter(dataAdapter);


    listView.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {
            // When clicked, show a toast with the TextView text
            Country country = (Country) parent.getItemAtPosition(position);
            Toast.makeText(getApplicationContext(),
                    "Clicked on Row: " + country.getName(),
                    Toast.LENGTH_LONG).show();
        }
    });

}

private class MyCustomAdapter extends ArrayAdapter<Country> {

    private ArrayList<Country> countryList;

    public MyCustomAdapter(Context context, int textViewResourceId,
                           ArrayList<Country> countryList) {
        super(context, textViewResourceId, countryList);
        this.countryList = new ArrayList<Country>();
        this.countryList.addAll(countryList);
    }

    private class ViewHolder {
        TextView code;
        CheckBox name;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder holder = null;
        Log.v("ConvertView", String.valueOf(position));

        if (convertView == null) {
            LayoutInflater vi = (LayoutInflater)getSystemService(
                    Context.LAYOUT_INFLATER_SERVICE);
            convertView = vi.inflate(R.layout.country_info, null);

            holder = new ViewHolder();
            holder.code = (TextView) convertView.findViewById(R.id.code);
            holder.name = (CheckBox) convertView.findViewById(R.id.checkBox1);
            convertView.setTag(holder);

            holder.name.setOnClickListener( new View.OnClickListener() {
                public void onClick(View v) {
                    CheckBox cb = (CheckBox) v ;
                    Country country = (Country) cb.getTag();
                    Toast.makeText(getApplicationContext(),
                            "Clicked on Checkbox: " + cb.getText() +
                                    " is " + cb.isChecked(),
                            Toast.LENGTH_LONG).show();
                    country.setSelected(cb.isChecked());
                }
            });
        }
        else {
            holder = (ViewHolder) convertView.getTag();
        }

        Country country = countryList.get(position);
        holder.code.setText(" (" +  country.getCode() + ")");
        holder.name.setText(country.getName());
        holder.name.setChecked(country.isSelected());
        holder.name.setTag(country);

        return convertView;

    }

}
}

Country.Java

public class Country {

String code = null;
String name = null;
boolean selected = false;

public Country(String code, String name, boolean selected) {
    super();
    this.code = code;
    this.name = name;
    this.selected = selected;
}

public String getCode() {
    return code;
}
public void setCode(String code) {
    this.code = code;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}

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

activity_xml

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

<TextView android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:padding="10dp"
    android:text="@string/some_text" android:textSize="20sp" />


<ListView android:id="@+id/listView1" android:layout_width="fill_parent"
    android:layout_height="fill_parent" />

country_info.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="6dip" >

<CheckBox
    android:id="@+id/checkBox1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:focusable="false"
    android:focusableInTouchMode="false"
    android:text="CheckBox" />

<TextView
    android:id="@+id/code"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBaseline="@+id/checkBox1"
    android:layout_alignBottom="@+id/checkBox1"
    android:layout_toRightOf="@+id/checkBox1"
    android:text="TextView" />