ApiClient for retrofit

retrofit-gson-okhttp3.gradle

implementation 'com.google.code.gson:gson:2.8.2'
implementation 'com.squareup.retrofit2:retrofit:2.4.0'
implementation 'com.squareup.okhttp3:okhttp:3.10.0'
implementation 'com.squareup.retrofit2:converter-gson:2.1.0'

retrofit-okhttp3-gson-client-class.java

/**
 * Use this class if you're using retrofit to make API call
 * and Gson converter factory
 */
public class ApiClient {
    private static Retrofit retrofit = null;

    public static Retrofit getClient() {

        // Get the OkHttpClient
        OkHttpClient client = new OkHttpClient.Builder().build();

        // Create a retrofit object
        retrofit = new Retrofit.Builder()
                .baseUrl("Your base-url string")
                .addConverterFactory(GsonConverterFactory.create())
                .client(client)
                .build();

        return retrofit;
    }
}