Using SharedPreferences data in Application class

Question

I am developing an app and I use Socket.io on it, I initialize the socket in a class that extends Application and looks like this:

public class Inicio extends Application{
    private Socket mSocket;
    private SharedPreferences spref;

    @Override
    public void onCreate(){
        super.onCreate();
        try{
            spref = getSharedPreferences("accountData", Context.MODE_PRIVATE);
            IO.Options op = new IO.Options();
            op.forceNew = true;
            op.reconnection = true;
            op.query = "tok=" + spref.getString("sessiontoken", "") + "&usr=" + spref.getString("userid", "");
            mSocket = IO.socket(Constants.serverAddress, op);
        }catch(URISyntaxException e){
            throw new RuntimeException(e);
        }
    }

    public Socket getmSocket(){
        return mSocket;
    }
}

So I can get and use the same socket instance in other parts of my application's code calling the following way:

Inicio appClass = (Inicio) getApplication();
mSocket = appClas.getmSocket();
mSocket.connect();

But there is a small problem that motivated me to post this question, can you see when I call to SharedPreferences in the Application class? I do this because I need to send the session token and user account ID to properly start the socket connection with my server, the problem is:

Imagine that a user opens the app for the first time and does not have an account yet, he will login or register and then the session token and user ID will be saved to SharedPreferences, but when the app started and ran the Application class, SharedPreferences was still empty and did not have the required token and user ID to establish the connection, so the user would have to reopen the app now to be able to use the socket successfully.

So I ask you: What are my alternative options for solving the problem? Is there another structure besides the Application class that I could use to not suffer from this problem? Or is there some way to bypass this problem?

What I'm doing to get around the problem for now is to restart the app programmatically when login occurs but I believe this is looks like a sad joke and not the ideal way to do it.

Thanks, I apologize for this long question of mine, but I'll be grateful for any help.

Answer 1

Separate your soket creation logic like below:

private void createSoket() {
    spref = getSharedPreferences("accountData", Context.MODE_PRIVATE);
    String sessiontoken = spref.getString("sessiontoken", "");
    String userId = spref.getString("userid", "");

    if(!(TextUtils.isEmpty(sessiontoken) || TextUtils.isEmpty(userId))) {
        try {

            IO.Options op = new IO.Options();
            op.forceNew = true;
            op.reconnection = true;
            op.query = "tok=" + sessiontoken + "&usr=" + userId;
            mSocket = IO.socket(Constants.serverAddress, op);
        } catch (URISyntaxException e) {
            throw new RuntimeException(e);
        }
    }
}

And when required soket check null and create before pass the instance.

public Socket getmSocket(){
    if(mSoket == null)
        createSoket();

    return mSocket;
}

N.B: Without valid settionToken and userId, soket is null

This is complete Application class:

public class Inicio extends Application{
    private Socket mSocket;
    private SharedPreferences spref;

    @Override
    public void onCreate(){
        super.onCreate();
        createSoket();
    }

    private void createSoket() {
        spref = getSharedPreferences("accountData", Context.MODE_PRIVATE);
        String sessiontoken = spref.getString("sessiontoken", "");
        String userId = spref.getString("userid", "");

        if(!(TextUtils.isEmpty(sessiontoken) || TextUtils.isEmpty(userId))) {
            try {

                IO.Options op = new IO.Options();
                op.forceNew = true;
                op.reconnection = true;
                op.query = "tok=" + sessiontoken + "&usr=" + userId;
                mSocket = IO.socket(Constants.serverAddress, op);
            } catch (URISyntaxException e) {
                throw new RuntimeException(e);
            }
        }
    }

    public Socket getmSocket(){
        if(mSoket == null)
            createSoket();

        return mSocket;
    }
}