Java – GCM getToken() sends java.io.IOException : TIMEOUT on some devices

I’m implementing push notifications, but I’m getting a TIMEOUT exception when I call getToken.

This issue only occurs on certain devices, such as SC-03D (4.0).

This is the IntentService:, which I used to register the token

public class RegistrationIntentService extends IntentService {

private static final String TAG = "GCM";
public static final String TOKEN_ID = "registration_id";

/**
 * Constructor
 */
public RegistrationIntentService() {
    super(TAG);
}

@Override
protected void onHandleIntent(Intent intent) {
    try {
         In the (unlikely) event that multiple refresh operations occur simultaneously, ensure that they are processed sequentially.
        synchronized (TAG) {
             Initially this call goes out to the network to retrieve the token, subsequent calls are local.
            InstanceID instanceID = InstanceID.getInstance(this);
            String gcm_sender_id = getString(R.string.gcm_sender_id);
            String token = instanceID.getToken(gcm_sender_id, GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);
            String storageToken = PrefsHelper.getTokenId(this);
            Log.d(TAG, "GCM Registration Token: " + token);
        }
    } catch (Exception e) {
        Log.d(TAG, "Failed to complete token refresh", e);
    }
}

You need to try to register the token using exponential backoff

The following code may help you

public class RegistrationIntentService extends IntentService {

private static final String TAG = "GCM";
    public static final String TOKEN_ID = "registration_id";
    private final static int MAX_ATTEMPTS = 5;
    private final static int BACKOFF_MILLI_SECONDS = 2000;

/**
     * Constructor
     */
    public RegistrationIntentService() {
        super(TAG);
    }

@Override
    protected void onHandleIntent(Intent intent) {

 In the (unlikely) event that multiple refresh operations occur simultaneously, ensure that they are processed sequentially.
            synchronized (TAG) {
                Random random = new Random();
                String token = null;
                InstanceID instanceID = InstanceID.getInstance(this);
                long backoff = BACKOFF_MILLI_SECONDS + random.nextInt(1000);
                for (int i = 1; i <= MAX_ATTEMPTS; i++) {
                    try {
                        token = instanceID.getToken(getString(R.string.gcm_sender_id); , GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);
                        if(null != token && !token.isEmpty()) {
                             break;
                        }
                    } catch (IOException e) {
                        Log exception
                    }
                    if (i == MAX_ATTEMPTS) {
                            break;
                        }
                        try {
                            Thread.sleep(backoff);
                        } catch (InterruptedException e1) {
                            break;
                        }
                     increase backoff exponentially
                    backoff *= 2;
                }
                 further processing for token goes here
            }
    }

More information< a href="https://developers.google.com/cloud-messaging/registration" rel="noreferrer noopener nofollow">see this