android - 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 deselect it & when I scroll down & then go back to that deselected checkbox its get automatically selected...

public class Contactlist_selfActivity extends ListActivity {
/** Called when the activity is first created. */

private ArrayList<contact> contact_list = null;
private ProgressDialog mProgressDialog = null;
private contactAdapter mContactAdapter = null;
private Runnable mViewcontacts = null;
private SparseBooleanArray mSelectedContacts = new SparseBooleanArray();
private ArrayList<contact> items;

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

    contact_list = new ArrayList<contact>();
    this.mContactAdapter = new contactAdapter(this, R.layout.listview,
            contact_list);
    ListView lv = getListView();
    setListAdapter(this.mContactAdapter);
    lv.setItemsCanFocus(false);
    lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    // }
    mViewcontacts = new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            getContacts();
        }
    };

    Thread thread = new Thread(null, mViewcontacts, "ContactReadBackground");
    thread.start();
    mProgressDialog = ProgressDialog.show(Contactlist_selfActivity.this,
            "Please Wait...", "Retriving Contacts...", true);
}

@SuppressWarnings("unused")
private void getContacts() {
    // TODO Auto-generated method stub

    try {

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

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

        while (mCursor.moveToNext()) {
            contact contact = new contact();

            String contactId = mCursor.getString(mCursor
                    .getColumnIndex(ContactsContract.Contacts._ID));

            contact.setContactName(mCursor.getString(mCursor
                    .getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)));
            contact_list.add(contact);
        }
        mCursor.close();

        runOnUiThread(returnRes);

    } catch (Exception e) {
        // TODO: handle exception
        Log.d("getContacts", e.getMessage());
    }
}

public class contactAdapter extends ArrayAdapter<contact> {
    private int[] isChecked;

    public contactAdapter(Context context, int textViewResourceId,
            ArrayList<contact> items1) {
        super(context, textViewResourceId, items1);
        items = items1;
    }

    @Override
    public View getView(final int position, View convertView,
            ViewGroup parent) {
        // TODO Auto-generated method stub
        final int position_clicked = 0;
        // Log.i("asd", "getView :" + getItem(position));

        if (convertView == null) {

            LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = vi.inflate(R.layout.listview, parent, false);
        }

        contact contacts = items.get(position);
        isChecked = new int[items.size()];

        if (contacts != null) {
            final CheckBox nameCheckBox = (CheckBox) convertView
                    .findViewById(R.id.checkBox);
            nameCheckBox.setChecked(mSelectedContacts.get(position));

            for (int i = 0; i < isChecked.length; i++) {

            }

            if (nameCheckBox != null) {
                nameCheckBox.setText(contacts.getContactName());
            }

            nameCheckBox.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    isChecked[position_clicked] = position;
                    Log.d("position", String.valueOf(position));
                }
            });

        }

        return convertView;
    }
}

private Runnable returnRes = new Runnable() {

    @Override
    public void run() {
        // TODO Auto-generated method stub
        if (mProgressDialog.isShowing())
            mProgressDialog.dismiss();
        mContactAdapter.notifyDataSetChanged();
    }
};
}

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<Contact> 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<Contact> planetList = new ArrayList<Contact>();
    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<Contact> {

    private LayoutInflater inflater;

    public ContactArrayAdapter(Context context, List<Contact> 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;
}

}