repositories {
    maven {
       url 'https://dl.bintray.com/ulrichraab/maven'
    }
}

dependencies {
    compile 'de.ulrichraab:rx-contacts:1.1.3'
}

<?xml version="1.0" encoding="UTF-8"?>
<metadata>
  <groupId>de.ulrichraab</groupId>
  <artifactId>rx-contacts</artifactId>
  <version>1.1.1</version>
  <versioning>
    <latest>1.1.1</latest>
    <release>1.1.1</release>
    <versions>
      <version>1.0.0</version>
      <version>1.0.1</version>
      <version>1.0.2</version>
      <version>1.0.3</version>
      <version>1.1.0</version>
      <version>1.1.1</version>
    </versions>
    <lastUpdated>20160826083246</lastUpdated>
  </versioning>
</metadata>

public void loadContacts(Context context, String phoneField) {
        RxContacts
                .fetch(context)
                .filter(contact -> contact.inVisibleGroup == 1)
                .filter(contact -> !contact.phoneNumbers.isEmpty())
                .filter(contact -> contact.phoneNumbers.iterator().next().contains(phoneField) || contact.displayName.toLowerCase().contains(phoneField.toLowerCase()))
                .toSortedList((lhs, rhs) -> lhs.displayName.compareToIgnoreCase(rhs.displayName))
                .compose(RxUtils.async())
                .compose(mRxLoaderManager.restart(CONTACTS_LOADER))
                .subscribe(this::handleResponse, this::handleError, this::onCompleted);
    }