Service definition on AndroidManifest

services.xml

<service
    android:name=".authenticator.AuthenticationService"
    android:exported="true" >
    <intent-filter>
        <action android:name="android.accounts.AccountAuthenticator" />
    </intent-filter>

    <meta-data
        android:name="android.accounts.AccountAuthenticator"
        android:resource="@xml/authenticator" />
</service>