This is also basic definition of Singleton design pattern. Since it is static if there is no instance available it just creates instance only once and when you call it always returns this static instance. Step 1: Please refer singleton pattern, we will create one class that's responsible for returning our retrofit instance. (Maybe retry refresh token couple of times before logging out the user) The flow is: If refresh token fails, logout current user and require to re-login.

You can use ampoline() or blockingGet() when refreshing your token to block that thread.Īlso inside authenticate method you can check if token is already refreshed by comparing request token with stored token to prevent unnecessary refresh.Īnd please do not consider using TokenInterceptor because it is edge case and not for everyone, just focus on TokenAuthenticator.įirst of all refreshing token is a critical process for most apps. Please make synchronous requests when refreshing your token inside Authenticator because you must block that thread until your request finishes, otherwise your requests will be executed twice with old and new tokens. In our previous blogs, we have already learned about starting with retrofit and how to upload a single file using retrofit. Retrofit makes it easy to connect to a REST web service by translating the API into Java interfaces. To beat this issue just add synchronized keyword to your TokenAuthenticators authenticate method. Retrofit is a very popular and great Network library for Android. You capture the image and it gets returned to our Upload activity and be set as our top banner. Choosing Camera immediately opens the camera. We show you a bottom sheet dialog with three options: Camera, Gallery and File Manager. For example when your activity and your service make requests concurrently. 1.You click the select/capture button in our upload activity. If you are making requests from several places your token will refresh multiple times inside TokenAuthenticator class. Actually I am using Dagger + RxJava + Retrofit but I just wanted to provide an answer to demonstrate logic for future visitors.

Retrofit file upload example