OkHttp Interceptors in Android

May 25 2021 · Kotlin 1.4, Android 5, Android Studio 4.1

Part 1: Implementing OkHttp Interceptors

05. Implement an Authorization Interceptor

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When working on an app that makes multiple API calls, it can be tedious to add the API key to every API call. Open MovieApi inside the network package. You will notice that the api_key query parameter is present in every method. This can get cumbersome as the number of API calls increases.

class ApiKeyInterceptor: Interceptor {

    override fun intercept(chain: Interceptor.Chain): Response {

    }
}
class ApiKeyInterceptor: Interceptor {

    override fun intercept(chain: Interceptor.Chain): Response {
        val originalRequest = chain.request()
        val originalUrl = originalRequest.url
    }
}
class ApiKeyInterceptor: Interceptor {

    override fun intercept(chain: Interceptor.Chain): Response {
        val originalRequest = chain.request()
        val originalUrl = originalRequest.url

        val url = originalUrl.newBuilder()
            .addQueryParameter("api_key", BuildConfig.THE_MOVIE_DB_API_TOKEN)
            .build()
    }
}
class ApiKeyInterceptor: Interceptor {

    private val apiKeyQueryParameterKey = "api_key"

    override fun intercept(chain: Interceptor.Chain): Response {
        val originalRequest = chain.request()
        val originalUrl = originalRequest.url

        val url = originalUrl.newBuilder()
            .addQueryParameter(apiKeyQueryParameterKey, BuildConfig.THE_MOVIE_DB_API_TOKEN)
            .build()
    }
}
class ApiKeyInterceptor: Interceptor {

    private val apiKeyQueryParameterKey = "api_key"

    override fun intercept(chain: Interceptor.Chain): Response {
        val originalRequest = chain.request()
        val originalUrl = originalRequest.url

        val url = originalUrl.newBuilder()
            .addQueryParameter(apiKeyQueryParameterKey, BuildConfig.THE_MOVIE_DB_API_TOKEN)
            .build()

        val newRequest = originalRequest.newBuilder()
            .url(url)
            .build()

        return chain.proceed(newRequest)
    }
}
val okHttpClient = OkHttpClient.Builder()
    .readTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
    .connectTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
    .addInterceptor(loggingInterceptor)
    .addInterceptor(ApiKeyInterceptor())
    .build()
val okHttpClient = OkHttpClient.Builder()
    .readTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
    .connectTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
    .addInterceptor(ApiKeyInterceptor())
    .addInterceptor(loggingInterceptor)
    .build()