Interceptor the team sounds like something which is used in between the source and destination. In another language, an interceptor can hijack HTTP requests before they reach the endpoint.

By the Wikipedia,

In the field of software development, an interceptor pattern is a software design pattern that is used when software systems or frameworks want to offer a way to change, or augment, their usual processing cycle. Key aspects of the pattern are that the change is transparent and used automatically. In essence, the rest of the system does not have to know something has been added or changed and can keep working as before. To facilitate this, a predefined interface for extension has to be implemented, some kind of dispatching mechanism is required where interceptors are registered (this may be dynamic, at runtime, or static, e.g. through configuration files) and context objects are provided, which allow access to the framework’s internal state.

How to add the interceptor in Retrofit2.0 android

Step 1: Create a retrofit client,

public static Retrofit getClient(final Context mContext) { retrofit = new Retrofit.Builder() .baseUrl(ApplicationConstant.BASE_URL) .addConverterFactory(GsonConverterFactory.create()) .build(); } return retrofit; }

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public static Retrofit getClient(final Context mContext) {                      retrofit = new Retrofit.Builder()                     .baseUrl(ApplicationConstant.BASE_URL)                     .addConverterFactory(GsonConverterFactory.create())                     .build();         }         return retrofit;     }

Step 2: Create interceptor,

OkHttpClient.Builder oktHttpClient = new OkHttpClient.Builder() .connectTimeout(ApplicationConstant.DEFAULT_CONNECT_TIMEOUT_IN_MIN, TimeUnit.MINUTES) .writeTimeout(ApplicationConstant.DEFAULT_WRITE_TIMEOUT_IN_MIN, TimeUnit.MINUTES) .readTimeout(ApplicationConstant.DEFAULT_READ_TIMEOUT_IN_MIN, TimeUnit.MINUTES);

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OkHttpClient.Builder oktHttpClient = new OkHttpClient.Builder()                     .connectTimeout(ApplicationConstant.DEFAULT_CONNECT_TIMEOUT_IN_MIN, TimeUnit.MINUTES)                     .writeTimeout(ApplicationConstant.DEFAULT_WRITE_TIMEOUT_IN_MIN, TimeUnit.MINUTES)                     .readTimeout(ApplicationConstant.DEFAULT_READ_TIMEOUT_IN_MIN, TimeUnit.MINUTES);

Step 3: Add interceptor,

oktHttpClient.addInterceptor(new Interceptor() { @Override public Response intercept(Chain chain) throws IOException { Request original = chain.request(); Request request = original.newBuilder() .header("token", AppSharedPref.getToken(mContext)) .method(original.method(), original.body()) .build(); return chain.proceed(request); } });

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oktHttpClient.addInterceptor(new Interceptor() {                     @Override                     public Response intercept(Chain chain) throws IOException {                         Request original = chain.request();                         Request request = original.newBuilder()                                 .header("token", AppSharedPref.getToken(mContext))                                 .method(original.method(), original.body())                                 .build();                         return chain.proceed(request);                     }                 });

Step 4: Add to the retrofit client,

retrofit = new Retrofit.Builder() .baseUrl(ApplicationConstant.BASE_URL) .addConverterFactory(GsonConverterFactory.create()) .client(oktHttpClient.build()) // add this line .build();

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retrofit = new Retrofit.Builder()                     .baseUrl(ApplicationConstant.BASE_URL)                     .addConverterFactory(GsonConverterFactory.create())                     .client(oktHttpClient.build()) // add this line                     .build();

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Happy Coding. Stay Super.