[Q] Filter Contacts by Group with ContactsContract - Android Q&A, Help & Troubleshooting

Hello!
I'm developing a big application and a part of it is about contacts. I want to, first, get all the groups of contacts. And when the users selects one, show all the contacts of the group.
I've seen other applications and widgets (like LauncherPro widget or HTC Sense Widget) than can do it, but when I try, I don't get same results.
My code is:
1.- To get an example group (this is just for testing, in real application user selects):
Code:
long idGroup = 0;
String[] GROUP_PROJECTION = new String[] {
ContactsContract.Groups._ID, ContactsContract.Groups.TITLE };
Cursor c = mcp.getContext().getContentResolver().query(ContactsContract.Groups.CONTENT_URI, GROUP_PROJECTION, null, null, ContactsContract.Groups.TITLE + " ASC");
while(c.moveToNext())
{
if (c.getString(1).contains("Family")){
idGroup = c.getLong(0);
}
}
c.close();
2.- To filter Users by group??
Thank you!

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2.- To filter Users by group??
Same question... Cannot find the answer... Anybody knows ?

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well maybe i should not revive this thread, but i had a lot of issues finding this,, my code working and you can filter and avoid repeated groups and only with phone numbers
Code:
String[] GROUP_PROJECTION = new String[] {
ContactsContract.Groups._ID, ContactsContract.Groups.TITLE,ContactsContract.Groups.SUMMARY_COUNT ,ContactsContract.Groups.SUMMARY_WITH_PHONES };
Cursor c = context.getApplicationContext().getContentResolver().query(
ContactsContract.Groups.CONTENT_SUMMARY_URI,
GROUP_PROJECTION,
ContactsContract.Groups.SUMMARY_WITH_PHONES +"> 0"
, null, ContactsContract.Groups.TITLE + " ASC");