How to compile 1 of multiple projects on android?

Question

Java

Hello. There is an Android project for working with different APIs (vk, ok, fb...). Now there is 1 class, which contains all the functions for working with the API. For example: vkPost(), vkDeletePost(), okPost(), fbPost() etc. I want to create separate classes for each social. networks (VKConfig, OKConfig, FBConfig...). All other code, except resources, is the same. Resources for each social. networks are in the folder app/src/appForVk/res, app/src/appForOk/res, app/src/appForFb/res. Everything is ok with them. When compiling, I choose which project I want to build. Question: how to add these 3+ .java classes in a similar way. So that not everyone pulls up, but only the one that requested. Now in gragle:

productFlavors {
        appForVk {
            applicationId 'com.social.myapp.vk'
        }
        appForOk {
            applicationId 'com.social.myapp.ok'
        }
}

.
Thank you.

Answer 1

Try this option:
1) create an interface to work with different APIs

public interface SocialApi {
    void post(Post post);
    void deletePost();
}

2) for each social network implement this interface

public class VkApi implements SocialApi {
    @Override
    void post(Post post){}
    @Override
    void deletePost(){}
}

3) in productFlavors you prescribe

productFlavors {
        appForVk {
            buildConfigField("com.social.myapp.SocialApi", 'api', "new com.social.myapp.vk.VkApi()")
            applicationId 'com.social.myapp.vk'
        }
        appForOk {
            buildConfigField("com.social.myapp.SocialApi", 'api', "new com.social.myapp.ok.OkApi()")
            applicationId 'com.social.myapp.ok'
        }
}

4) next, a field will be generated in BuildConfig
Through BuildConfig.api, you can work with the social network and the class implementation will be substituted for different ProductFlavor