Set dynamic base url using Retrofit 2.0 and Dagger 2

Question

I\'m trying to perform a login action using Retrofit 2.0 using Dagger 2

Here\'s how I set up Retrofit dependency

@Provides
@Singleton
Retrofit provid         


        

Answer 1

Please look into my workaround for Dagger dynamic URL.

Step1: Create an Interceptor

import android.util.Patterns;

import com.nfs.ascent.mdaas.repo.network.ApiConfig;

import java.io.IOException;

import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;

public class DomainURLInterceptor implements Interceptor {

    @Override
    public Response intercept(Chain chain) throws IOException {
        Request original = chain.request();

        String requestUrl = original.url().toString();
        String PROTOCOL = "(?i:http|https|rtsp)://";
        String newURL = requestUrl.replaceFirst(PROTOCOL, "")
                .replaceFirst(Patterns.DOMAIN_NAME.toString(), "");
        newURL = validateBackSlash(newURL) ? ApiConfig.BASE_URL.concat(newURL) : newURL.replaceFirst("/", ApiConfig.BASE_URL);
        original = original.newBuilder()
                .url(newURL)
                .build();

        return chain.proceed(original);
    }

    private boolean validateBackSlash(String str) {
        if (!str.substring(str.length() - 1).equals("/")) {
            return true;
        }
        return false;
    }

}

Step 2:

add your newly created interceptor in your module

    @Provides
    @Singlton
    DomainURLInterceptor getChangeURLInterceptor() {
        return new DomainURLInterceptor();
    }

step 3: add interceptor into list of HttpClient interceptors

    @Provides
    @Singlton
    OkHttpClient provideHttpClient() {
        return new OkHttpClient.Builder()
                .addInterceptor(getChangeURLInterceptor())
                .readTimeout(ApiConfig.API_CONNECTION_TIMEOUT, TimeUnit.SECONDS)
                .connectTimeout(ApiConfig.API_CONNECTION_TIMEOUT, TimeUnit.SECONDS)
                .build();
    }

step 4:

    @Provides
    @Singlton
    Retrofit provideRetrofit() {
        return new Retrofit.Builder()
                .baseUrl(ApiConfig.BASE_URL) // this is default URl,
                .addConverterFactory(provideConverterFactory())
                .client(provideHttpClient())
                .build();
    }

Note: if the user has to change the Base URL from settings, remember to validate the newly created URL with below method:

    public final static boolean isValidUrl(CharSequence target) {
        if (target == null) {
            return false;
        } else {
            return Patterns.WEB_URL.matcher(target).matches();
        }
    }