如何获取android系统中的联系人和电话号码

// These are the Contacts rows that we will retrieve.
static final String[] CONTACTS_SUMMARY_PROJECTION = new String[]{
ContactsContract.Contacts._ID,
ContactsContract.Contacts.DISPLAY_NAME,
ContactsContract.Contacts.CONTACT_STATUS,
ContactsContract.Contacts.CONTACT_PRESENCE,
ContactsContract.Contacts.PHOTO_ID,
ContactsContract.Contacts.LOOKUP_KEY,
}
Uri baseUri = ContactsContract.Contacts.CONTENT_URI;
// Now create and return a CursorLoader that will take care of
// creating a Cursor for the data being displayed.
String select = "((" + ContactsContract.Contacts.DISPLAY_NAME + " NOTNULL) AND ("
+ ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1) AND ("
+ ContactsContract.Contacts.DISPLAY_NAME + " != '' ))";

return new CursorLoader(ContactActivity.this.getApplicationContext(), baseUri,
CONTACTS_SUMMARY_PROJECTION, select, null,
ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC");

List<Map<String, String>> list = new ArrayList<>();
while (data.moveToNext()) {

Map<String, String> map = new HashMap();
String name = data.getString(data.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
String ContactId = data.getString(data.getColumnIndex(ContactsContract.Contacts._ID));

Cursor phone = getContentResolver().query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=" + ContactId,
null,
null);
while (phone.moveToNext()) {
String Number = phone.getString(phone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
if (Number != null) {

map.put(name, Number);
}
}

list.add(map);
}