OkHttpClient throws exception after upgrading to OkHttp3

You have to use builder if you want to create OkHttp(3)Client object.

Try change this:

private static OkHttpClient defaultHttpClient = new OkHttpClient();

To something like this:

  OkHttpClient defaultHttpClient = new OkHttpClient.Builder()       .addInterceptor(           new Interceptor() {             @Override             public Response intercept(Interceptor.Chain chain) throws IOException {                   Request request = chain.request().newBuilder()                   .addHeader("Accept", "Application/JSON").build();               return chain.proceed(request);              }           }).build();

compile 'com.squareup.retrofit2:retrofit:2.1.0'compile "com.squareup.retrofit2:converter-gson:2.1.0"compile "com.squareup.retrofit2:adapter-rxjava:2.1.0"compile 'com.squareup.okhttp3:logging-interceptor:3.4.0'

You should probably use these versions. Just put them, sync your gradle, delete all imports, and try again.

import okhttp3.Interceptor;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;import okhttp3.logging.HttpLoggingInterceptor;import retrofit2.Retrofit;import retrofit2.converter.gson.GsonConverterFactory;