package com.example.harry2636.emotionanalyzer;

/**
 * Created by harrykim on 2017. 4. 11..
 */

public class Configuration {
  //TODO: fix ip address
  public static final String SERVER_ADDRESS = "SERVER_ADDRESS"; //This must not be localhost!!!
  public static final String API_KEY = "AIzaSyDKYGldszOioPAiSFTKrto200NbSEg1aVI";
}

package com.example.harry2636.emotionanalyzer;

/**
 * Created by harrykim on 2017. 4. 11..
 */

public class Configuration {
  //TODO: fix ip address
  public static final String SERVER_ADDRESS = "http://ipaddress:port"; // example: "http://192.249.28.84:3000"
  public static final String API_KEY = "AIzaSyDKYGldszOioPAiSFTKrto200NbSEg1aVI";
}

Add configuration example.