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    <p>You have three questions here:</p> <ol> <li>How to enumerate the contact groups for a given account.</li> <li>How to mark a group as special.</li> <li>How to take action on contacts in that group.</li> </ol> <p>So, going down the list...</p> <p><strong>1. Enumerating contact groups</strong></p> <p>The <a href="http://developer.android.com/reference/android/provider/Contacts.Groups.html" rel="nofollow" title="Contacts.Groups">ContactsContract.Groups</a> table stores the list of contact groups on the system. So, you'll want to issue a query that looks like this:</p> <pre><code>public Loader&lt;Cursor&gt; onCreateLoader(int i, Bundle bundle) { Uri uri = ContactsContract.Groups.CONTENT_URI; Log.i(TAG, "URI: " + uri); String[] projection = new String[] { ContactsContract.Groups._ID, ContactsContract.Groups.TITLE }; return new CursorLoader(this, uri, projection, null, null, null); } </code></pre> <p>This loader will get you the list of all the groups on the system, and their database IDs.</p> <h3>How to mark a group as special</h3> <p>This is something your application will need to take care of. Just maintain a list of group IDs that are in your special list.</p> <p>To determine whether a contact is in the "special" group, you can query the <a href="http://developer.android.com/reference/android/provider/ContactsContract.Data.html" rel="nofollow" title="ContactsContract.Data">ContactsContract.Data</a> table using a SQL <code>where</code> clause like the following:</p> <pre><code>String where = ContactsContract.CommonDataKinds.GroupMembership.GROUP_ROW_ID + "=" + groupid + " AND " + ContactsContract.CommonDataKinds.GroupMembership.MIMETYPE + "='" + ContactsContract.CommonDataKinds.GroupMembership.CONTENT_ITEM_TYPE + "'"; </code></pre> <p>where <code>groupid</code> is the database ID of the group you've marked as special. (If you have more than one group, start adding <code>OR</code> clauses.)</p> <p>(You need to check for the CONTENT_ITEM_TYPE mimetype because the <a href="http://developer.android.com/reference/android/provider/ContactsContract.Data.html" rel="nofollow" title="ContactsContract.Data">ContactsContract.Data</a> table is used for storing arbitrary metadata for contacts, and the meaning of the columns in that table vary by mimetype. <code>GroupMembership.GROUP_ROW_ID</code> is simply a pointer to the column <code>data1</code>.)</p> <p><strong>3. How to take action on contacts in that group</strong></p> <p>This depends on what you're trying to accomplish, but in general, you'll create a broadcast receiver that listens for <code>android.intent.action.PHONE_STATE</code>. If the state in <code>TelephonyManager.EXTRA_STATE</code> is listed as <code>TelephonyManager.EXTRA_STATE_RINGING</code>, then you can get the phone number by looking in <code>TelephonyManager.EXTRA_INCOMING_NUMBER</code> to find the phone number.</p> <p>(There's sample code for this attached to this article: <a href="http://www.krvarma.com/2010/08/detecting-incoming-and-outgoing-calls-in-android/" rel="nofollow">http://www.krvarma.com/2010/08/detecting-incoming-and-outgoing-calls-in-android/</a>)</p> <p>You'll then need to check the Contacts database again to find any known contacts with that phone number. You can do this using the <a href="http://developer.android.com/reference/android/provider/ContactsContract.PhoneLookup.html" rel="nofollow" title="ContactsContract.PhoneLookup">ContactsContract.PhoneLookup</a> table.</p> <pre><code>Uri uri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(phoneNumber)); resolver.query(uri, new String[]{PhoneLookup.DISPLAY_NAME,... </code></pre> <p>That will get you the Contact's database ID in the <code>ContactsContract.Contacts</code> table. The last step here is to match that up with the <code>ContactsContract.RawContacts</code> rows for that contact (search using the <code>CONTACT_ID</code> column), and find the set of RawContacts _IDs that represent that contact. You'll then use this to search through the group membership table, as described above.</p>
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    1. POList all Google contact groups in Android
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    1. COThank you very much! I have managed to find all groups in the phone and made them "special" in a bit more "clumsy way", but it work. The problem is now that when I catch the incoming call and shall find out if the number is in any groups i get an exception.
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    2. CODon't now how to write code here formated in a nice way, else I would post source with the problem. ;)
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