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    <p>You can store custom data in the contacts database. However "when a user looks at the contacts he or she knows what users they can use my app with," may not be possible if you are thinking users will be able to see the custom data you inserted while using the built-in Android Contacts application. You would have to display the custom data in your own application.</p> <p>The javadocs for the <a href="http://developer.android.com/reference/android/provider/ContactsContract.Data.html" rel="nofollow">ContactsContract.Data</a> class should provide an explanation, as well as the <a href="http://developer.android.com/guide/topics/providers/contacts-provider.html" rel="nofollow">Contacts article</a>.</p> <p>To use this you'll need to get a raw contact id by querying the <a href="http://developer.android.com/reference/android/provider/ContactsContract.RawContacts.html" rel="nofollow">RawContacts</a>.</p> <p>Here some example code that might help you get started...</p> <pre><code>private void makePowerful(int rawContactId) { ContentValues values = new ContentValues(); values.put(Privilege.RAW_CONTACT_ID, rawContactId); values.put(Privilege.MIMETYPE, Privilege.CONTENT_ITEM_TYPE); values.put(Privilege.PRIVILEGE_LEVEL, Privilege.TYPE_POWERFUL); Uri uri = getContentResolver().insert(Data.CONTENT_URI, values); } public static final class Privilege implements ContactsContract.DataColumnsWithJoins, ContactsContract.CommonDataKinds.CommonColumns { public static final String CONTENT_ITEM_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE + "/my_app_privilege"; public static final int TYPE_POWERFUL = 1; public static final int TYPE_WEAK = 2; public static final String PRIVILEGE_LEVEL = DATA1; private Privilege() { } } </code></pre>
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    1. POCan I extend Androids Contacts database?
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    1. COAny idea where the Contacts article went to? The link is dead (:
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      1. USJeroen Wiert Pluimers
    2. COI've updated the link, this one should help: http://developer.android.com/guide/topics/providers/contacts-provider.html
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    3. COThanks. It's to investigate a weird problem I have with the Contacts Database: http://wiert.me/2012/07/24/small-follow-up-on-android-help-needed-app-that-cleans-up-the-contacts-mess-that-the-linkedin-app-left-behind/ (580 meg large, and automagically growing without any apps active).
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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