What is the most effective method for refreshing a token every half an hour when the server does not send a 401 error upon expiration in Android/Retrofit?

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One effective method for refreshing a token every half an hour when the server does not send a 401 error upon expiration in Android/Retrofit is to use an interceptor in Retrofit.

An interceptor is a class that provides a way to intercept the requests and responses before they are sent or received by Retrofit. In this case, we can use an interceptor to check the expiration time of the token and refresh it if necessary.

Here's an example of how to implement the interceptor:

1. Create a class called TokenInterceptor that implements the Interceptor interface from Retrofit:

public class TokenInterceptor implements Interceptor {

    @Override
    public Response intercept(Chain chain) throws IOException {
        // TODO: Implement token refresh logic
        return chain.proceed(chain.request());
    }
}

1. In the intercept() method, you can implement the logic to check the expiration time of the token and refresh it if necessary.

2. Add the interceptor to your Retrofit client using the addInterceptor() method:

OkHttpClient client = new OkHttpClient.Builder()
        .addInterceptor(new TokenInterceptor())
        .build();

Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(BASE_URL)
        .client(client)
        .build();

With this setup, every time a request is made using the Retrofit client, it will be intercepted by the TokenInterceptor and the token will be refreshed as necessary.