checkbox in listview for multiple selection of contacts

Question

I had tried to to put checkbox in listview through layout inflator and I got success but the problem is when I select the multiple contacts there is no problem but when I de

Answer 1

i found the answer.... i had just taken a new variable in contact class...

public class PlanetsActivity extends Activity {
private ListView mainListView;
private Contact[] contact_read;
private Cursor mCursor;
private ArrayAdapter listAdapter;

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

    // Find the ListView resource.
    mainListView = (ListView) findViewById(R.id.mainListView);

    mainListView
            .setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView parent, View item,
                        int position, long id) {
                    Contact planet = listAdapter.getItem(position);
                    planet.toggleChecked();
                    ContactViewHolder viewHolder = (ContactViewHolder) item
                            .getTag();
                    viewHolder.getCheckBox().setChecked(planet.isChecked());
                }
            });

    // Throw Query and fetch the contacts.

    String[] projection = new String[] { Contacts.HAS_PHONE_NUMBER,
            Contacts._ID, Contacts.DISPLAY_NAME };

    mCursor = managedQuery(Contacts.CONTENT_URI, projection,
            Contacts.HAS_PHONE_NUMBER + "=?", new String[] { "1" },
            Contacts.DISPLAY_NAME);

    if (mCursor != null) {
        mCursor.moveToFirst();
        contact_read = new Contact[mCursor.getCount()];

        // Add Contacts to the Array

        int j = 0;
        do {

            contact_read[j] = new Contact(mCursor.getString(mCursor
                    .getColumnIndex(Contacts.DISPLAY_NAME)));
            j++;
        } while (mCursor.moveToNext());

    } else {
        System.out.println("Cursor is NULL");
    }

    // Add Contact Class to the Arraylist

    ArrayList planetList = new ArrayList();
    planetList.addAll(Arrays.asList(contact_read));

    // Set our custom array adapter as the ListView's adapter.
    listAdapter = new ContactArrayAdapter(this, planetList);
    mainListView.setAdapter(listAdapter);
}

/** Holds Contact data. */
@SuppressWarnings("unused")
private static class Contact {
    private String name = "";
    private boolean checked = false;

    public Contact() {
    }

    public Contact(String name) {
        this.name = name;
    }

    public Contact(String name, boolean checked) {
        this.name = name;
        this.checked = checked;
    }

    public String getName() {
        return name;
    }

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

    public boolean isChecked() {
        return checked;
    }

    public void setChecked(boolean checked) {
        this.checked = checked;
    }

    public String toString() {
        return name;
    }

    public void toggleChecked() {
        checked = !checked;
    }
}

/** Holds child views for one row. */
@SuppressWarnings("unused")
private static class ContactViewHolder {
    private CheckBox checkBox;
    private TextView textView;

    public ContactViewHolder() {
    }

    public ContactViewHolder(TextView textView, CheckBox checkBox) {
        this.checkBox = checkBox;
        this.textView = textView;
    }

    public CheckBox getCheckBox() {
        return checkBox;
    }

    public void setCheckBox(CheckBox checkBox) {
        this.checkBox = checkBox;
    }

    public TextView getTextView() {
        return textView;
    }

    public void setTextView(TextView textView) {
        this.textView = textView;
    }
}

/** Custom adapter for displaying an array of Contact objects. */
private static class ContactArrayAdapter extends ArrayAdapter {

    private LayoutInflater inflater;

    public ContactArrayAdapter(Context context, List planetList) {
        super(context, R.layout.simplerow, R.id.rowTextView, planetList);
        // Cache the LayoutInflate to avoid asking for a new one each time.
        inflater = LayoutInflater.from(context);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // Contact to display
        Contact planet = (Contact) this.getItem(position);
        System.out.println(String.valueOf(position));

        // The child views in each row.
        CheckBox checkBox;
        TextView textView;

        // Create a new row view
        if (convertView == null) {
            convertView = inflater.inflate(R.layout.simplerow, null);

            // Find the child views.
            textView = (TextView) convertView
                    .findViewById(R.id.rowTextView);
            checkBox = (CheckBox) convertView.findViewById(R.id.CheckBox01);

            // Optimization: Tag the row with it's child views, so we don't
            // have to
            // call findViewById() later when we reuse the row.
            convertView.setTag(new ContactViewHolder(textView, checkBox));

            // If CheckBox is toggled, update the Contact it is tagged with.
            checkBox.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    CheckBox cb = (CheckBox) v;
                    Contact contact = (Contact) cb.getTag();
                    contact.setChecked(cb.isChecked());
                }
            });
        }
        // Reuse existing row view
        else {
            // Because we use a ViewHolder, we avoid having to call
            // findViewById().
            ContactViewHolder viewHolder = (ContactViewHolder) convertView
                    .getTag();
            checkBox = viewHolder.getCheckBox();
            textView = viewHolder.getTextView();
        }

        // Tag the CheckBox with the Contact it is displaying, so that we
        // can
        // access the Contact in onClick() when the CheckBox is toggled.
        checkBox.setTag(planet);

        // Display Contact data
        checkBox.setChecked(planet.isChecked());
        textView.setText(planet.getName());

        return convertView;
    }

}

public Object onRetainNonConfigurationInstance() {
    return contact_read;
}

}