How to implement AccountManager in my app

I try to implement an account manager in my app to avoid that the user has to log in each time he opens the app.

So basically, I already have my Authentication Activity where the user can put its login and password and where we receive a token from the server (the authentication is basic for now). Now I want to add the AccountManager but I don't really understand which part would go where.

What I need is pretty basic:

add an account if I never logged in before
log automatically if my account exists
if the auto authentication doesn't work get a new token on the server

Here is my code :

AuthenticationActivity.java

public class AuthenticationActivity extends Activity {

    private EditText editTextUsername;
    private EditText editTextPassword;
    private Button buttonLogin;
    private ProgressBar spinner;
    private TextView error;
    private TextView register;

    private boolean accountRegistred;

    AccountManager accountManager;

    public static final String AUTHENTICATION = "authentication"; //action

    private ConnectionSuccessReceiver connectionSuccessReceiver = new ConnectionSuccessReceiver();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.authentification);

        accountManager = AccountManager.get(this);
        Account[] accounts = accountManager.getAccountsByType("login");

        if (accounts.length > 0) {
            //If there is an account
        } else {
            accountRegistred = false;
            editTextUsername = (EditText) findViewById(R.id.editText_login);
            editTextUsername.setVisibility(View.VISIBLE);
            editTextPassword = (EditText) findViewById(R.id.editText_password);
            editTextPassword.setVisibility(View.VISIBLE);
            buttonLogin = (Button) findViewById(R.id.button_connection);
            buttonLogin.setVisibility(View.VISIBLE);
            error = (TextView) findViewById(R.id.textView_error);
            register = (TextView) findViewById(R.id.textView_register);
            register.setVisibility(View.VISIBLE);
            spinner = (ProgressBar) findViewById(R.id.progressBar);

            buttonLogin.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    //Here we start the service which will reach the server 
                    Intent i = new Intent(getApplicationContext(), AuthenticationService.class);
                    i.putExtra("username", editTextUsername.getText().toString());
                    i.putExtra("password", editTextPassword.getText().toString());
                    getApplication().startService(i);
                    spinner.setVisibility(View.VISIBLE);
                    error.setVisibility(View.INVISIBLE);
                }
            });

            register.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    startActivity(new Intent(AuthenticationActivity.this, RegisterActivity.class));
                }
            });
        }
        registerReceiver(connectionSuccessReceiver, new IntentFilter(AUTHENTICATION));
    }

    private class ConnectionSuccessReceiver extends BroadcastReceiver {
        //Called when the server returns success after authentication, we get the TOKEN here
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getStringExtra("STATE").equals("CONNECTED")) {
                Intent i = new Intent(AuthenticationActivity.this, MainActivity.class);
                i.putExtra("TOKEN", intent.getStringExtra("TOKEN"));
                startActivity(i);
            } else {
                spinner.setVisibility(View.INVISIBLE);
                error.setVisibility(View.VISIBLE);
            }
            finish();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(connectionSuccessReceiver);
    }
}

AuthenticatorService.java

public class AuthenticatorService extends Service {

    /**
     * The implementation of the class |AccountAuthenticatorImpl|.
     * It is implemented as a singleton
     */
    private static AccountAuthenticator accountAuthenticator = null;

    /**
     * The main constructor.
     */
    public AuthenticatorService() {
        super();
    }

    /**
     * The bind method of the service.
     * @param intent The intent used to invoke the service
     * @return The binder of the class which has implemented |AbstractAccountAuthenticator|
     */
    @Override
    public IBinder onBind(Intent intent) {
        IBinder ret = null;
        if (intent.getAction().equals(android.accounts.AccountManager.ACTION_AUTHENTICATOR_INTENT)) {
            ret = getAuthenticator().getIBinder();
        }
        return ret;
    }

    /**
     * The method used to obtain the authenticator. It is implemented as a singleton
     * @return The implementation of the class |AbstractAccountAuthenticator|
     */
    private AccountAuthenticator getAuthenticator() {
        if (AuthenticatorService.accountAuthenticator == null) {
            AuthenticatorService.accountAuthenticator = new AccountAuthenticator(this);
        }

        return AuthenticatorService.accountAuthenticator;
    }

    public class AccountAuthenticator extends AbstractAccountAuthenticator {
        private Context context;

        public AccountAuthenticator(Context context) {
            super(context);
            this.context = context;
        }

        @Override
        public Bundle editProperties(AccountAuthenticatorResponse accountAuthenticatorResponse, String s) {
            return null;
        }

        @Override
        public Bundle addAccount(AccountAuthenticatorResponse response, String accountType, String authTokenType, String[] requiredFeatures, Bundle options) throws NetworkErrorException {

            Bundle reply = new Bundle();

            Intent i = new Intent(context, AuthenticationActivity.class);
            i.setAction("com.readyo.app.authentication.addnewaccount");
            i.putExtra(AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE, response);
            i.putExtra("AuthTokenType", authTokenType);

            reply.putParcelable(AccountManager.KEY_INTENT, i);

            return reply;
        }

        @Override
        public Bundle confirmCredentials(AccountAuthenticatorResponse accountAuthenticatorResponse, Account account, Bundle bundle) throws NetworkErrorException {
            return null;
        }

        @Override
        public Bundle getAuthToken(AccountAuthenticatorResponse accountAuthenticatorResponse, Account account, String s, Bundle bundle) throws NetworkErrorException {
            return null;
        }

        @Override
        public String getAuthTokenLabel(String s) {
            return null;
        }

        @Override
        public Bundle updateCredentials(AccountAuthenticatorResponse accountAuthenticatorResponse, Account account, String s, Bundle bundle) throws NetworkErrorException {
            return null;
        }

        @Override
        public Bundle hasFeatures(AccountAuthenticatorResponse accountAuthenticatorResponse, Account account, String[] strings) throws NetworkErrorException {
            return null;
        }
    }
}

I have also code to reach the server via HTTP but I'm not sure it would be important here.

Thank you for your time.

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