java - using checkbox to filter contacts and get phone number

Question

I am working on an app that works similar to the default text messaging app on all Android phones. My problem is selecting more than one user to send an SMS message to. What I have done so far is stored my contacts as listview items with check boxes. Now I just need to get the phone numbers from the selected contacts.

So what I am having trouble on doing. 1) Pulling a phone number from the contacts displayed in my listview 2)displaying that number in a textview in a new activity

Sorry if my code is difficult to understand, please ask if you need clerification.

This is the XML in which the listview is shown, called contact_manager.xml:

 <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

        <ListView
            android:id="@+id/contactList"
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:layout_weight="1" />

        <Button
            android:id="@+id/showInvisible"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/showInvisible" />

    </LinearLayout>

This is my Activity that calls everything together.

public final class ContactManager extends Activity {

public static final String TAG = "ContactManager";

private ListView mContactList;
private boolean mShowInvisible;
private Button mShowInvisibleControl;

/**
 * Called when the activity is first created. Responsible for initializing
 * the UI.
 */
@Override
public void onCreate(Bundle savedInstanceState) {
    Log.v(TAG, "Activity State: onCreate()");
    super.onCreate(savedInstanceState);
    setContentView(R.layout.contact_manager);

    // Obtain handles to UI objects

    mContactList = (ListView) findViewById(R.id.contactList);
    mShowInvisibleControl = (Button) findViewById(R.id.showInvisible);

    // Initialize class properties
    mShowInvisible = false;
    // mShowInvisibleControl.setChecked(mShowInvisible);
    mShowInvisibleControl.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {

        }
    });
    populateContactList();
}

/**
 * Populate the contact list based on account currently selected in the
 * account spinner.
 */
private void populateContactList() {
    // Build adapter with contact entries
    Cursor cursor = getContacts();
    String[] fields = new String[] { ContactsContract.Data.DISPLAY_NAME };
    SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
            R.layout.contact_entry, cursor, fields,
            new int[] { R.id.contactEntryText });
    mContactList.setAdapter(adapter);
}

/**
 * Obtains the contact list for the currently selected account.
 * 
 * @return A cursor for for accessing the contact list.
 */
private Cursor getContacts() {
    // Run query
    Uri uri = ContactsContract.Contacts.CONTENT_URI;
    String[] projection = new String[] { ContactsContract.Contacts._ID,
            ContactsContract.Contacts.DISPLAY_NAME };
    String selection = ContactsContract.Contacts.IN_VISIBLE_GROUP + " = '"
            + (mShowInvisible ? "0" : "1") + "'";
    String[] selectionArgs = null;
    String sortOrder = ContactsContract.Contacts.DISPLAY_NAME
            + " COLLATE LOCALIZED ASC";

    return managedQuery(uri, projection, selection, selectionArgs,
            sortOrder);
}

contact_entry.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >

    <CheckBox
        android:id="@+id/contactEntryText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@+id/contactEntryText" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/contactList"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <Button
        android:id="@+id/showInvisible"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/showInvisible" />

</LinearLayout>

This is my invite_text.xml This is actually the text view i want to input the numbers into so i can send a mass text message.

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/contacts"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="10dp"
                android:gravity="center"
                android:paddingBottom="10dp"
                android:paddingLeft="10dp"
                android:paddingTop="10dp"
                android:text="@string/contacts"
                android:textAppearance="?android:attr/textAppearanceLarge" />
            <!-- android:textColor="#fff" android:background="@drawable/header" for header background -->

            <Button
                android:id="@+id/contactsButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_alignParentTop="true"
                android:text="@string/contacts" />
        </RelativeLayout>

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/enter_contact"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <AutoCompleteTextView
            android:id="@+id/contactnumber"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="@string/to" >

            <requestFocus />
        </AutoCompleteTextView>

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/message_to_send"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <EditText
            android:id="@+id/invite_text"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/message_join" />

        <Button
            android:id="@+id/sendtxt"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:onClick="doLaunchContactPicker"
            android:text="@string/send_txt" />
    </LinearLayout>

</ScrollView>

If you need me to post any more information, please ask.

Answer 1

I have not looked at your code but here is the mechanism which worked for me:

1. Put setOnCheckedChangeListener to your checkbox.

2. If Checkbox is Checked then add that contact to arraylist.

3. If CheckBox is unchecked then remove that contact from arraylist.

4. Start your contact list activity with startActivityForResult() and override onActivityResult().

5. Before leaving contact activity set your selected contacts in intent.

6. Receive the selected contacts in your activity.

7. Now you have selected contacts which you can show in TextView.

Note: You need to use custom list adapter for this:

Custom List Adapter:

public class YourAdapterName extends BaseAdapter{

private Context mContext;
private ArrayList<string> mValuestoShow;

/**
 * Constructor to be called to initialize adapter with values.
 * @param context
 * @param vector
 */
public YourAdapterName(Context context, ArrayList<string> contacts){
    mContext = context;
    mValuestoShow = contacts;
}

public int getCount() {
    if(null != mValuestoShow){
        return mValuestoShow.size();
    }
    return 0;
}

public Object getItem(int position) {
    if(position < mValuestoShow.size())
        return  mValuestoShow.get(position);
    else
        return null;
}

public long getItemId(int position) {
    return 0;
}

/**
 * This method can be override to enable/disable particular list row.
 */
@Override
public boolean isEnabled(int position) {
    //Write your code here......
    return super.isEnabled(position);
}

public View getView(final int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            LayoutInflater li =(LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = li.inflate(R.layout.contact_list_layout, null);
            holder = new ViewHolder();
            holder.name = (TextView)convertView.findViewById(R.id.name);
            holder.checkbox = (CheckBox)convertView.findViewById(R.id.checkbox);
            convertView.setTag(holder);
        }
        else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.name.setText(text goes here ....);

        holder.checkbox.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if ( isChecked )
                    //Add contact...
                else
                    //Remove contact.
            }
        });

        return convertView;
    }

    class ViewHolder {
        TextView name;
        CheckBox checkbox;
    }

}

your_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp" >

    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="50dp"
        android:ellipsize="end"
        android:singleLine="true"
        android:textColor="@android:color/black" />

    <CheckBox
        android:id="@+id/checkbox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true" />

</RelativeLayout>