/** Implement AbstractAccountAuthenticator and stub out all* of its methods*/
public class Authenticator extends AbstractAccountAuthenticator {// Simple constructorpublic Authenticator(Context context) {super(context);}// Editing properties is not supported
    @Overridepublic Bundle editProperties(AccountAuthenticatorResponse r, String s) {throw new UnsupportedOperationException();}// Don't add additional accounts
    @Overridepublic Bundle addAccount(AccountAuthenticatorResponse r,String s,String s2,String[] strings,Bundle bundle) throws NetworkErrorException {return null;}// Ignore attempts to confirm credentials
    @Overridepublic Bundle confirmCredentials(AccountAuthenticatorResponse r,Account account,Bundle bundle) throws NetworkErrorException {return null;}// Getting an authentication token is not supported
    @Overridepublic Bundle getAuthToken(AccountAuthenticatorResponse r,Account account,String s,Bundle bundle) throws NetworkErrorException {throw new UnsupportedOperationException();}// Getting a label for the auth token is not supported
    @Overridepublic String getAuthTokenLabel(String s) {throw new UnsupportedOperationException();}// Updating user credentials is not supported
    @Overridepublic Bundle updateCredentials(AccountAuthenticatorResponse r,Account account,String s, Bundle bundle) throws NetworkErrorException {throw new UnsupportedOperationException();}// Checking features for the account is not supported
    @Overridepublic Bundle hasFeatures(AccountAuthenticatorResponse r,Account account, String[] strings) throws NetworkErrorException {throw new UnsupportedOperationException();}
}

/*** A bound Service that instantiates the authenticator* when started.*/
public class AuthenticatorService extends Service {...// Instance field that stores the authenticator objectprivate Authenticator mAuthenticator;@Overridepublic void onCreate() {// Create a new authenticator objectmAuthenticator = new Authenticator(this);}/** When the system binds to this Service to make the RPC call* return the authenticator's IBinder.*/@Overridepublic IBinder onBind(Intent intent) {return mAuthenticator.getIBinder();}
}

<?xml version="1.0" encoding="utf-8"?>
<account-authenticatorxmlns:android="http://schemas.android.com/apk/res/android"android:accountType="example.com"android:icon="@drawable/ic_launcher"android:smallIcon="@drawable/ic_launcher"android:label="@string/app_name"/>

    <serviceandroid:name="com.example.android.syncadapter.AuthenticatorService"><intent-filter><action android:name="android.accounts.AccountAuthenticator"/></intent-filter><meta-dataandroid:name="android.accounts.AccountAuthenticator"android:resource="@xml/authenticator" /></service>