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app/src/main/java/com/ssb/simplitend/articles/ArticlePresenter.java

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+package com.ssb.simplitend.articles;
+
+import androidx.annotation.NonNull;
+
+import com.ssb.simplitend.apputils.RetrofitHelper;
+import com.ssb.simplitend.welcome.welcomepatient.mvvm.models.CallResponse;
+
+import java.util.ArrayList;
+
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+
+public class ArticlePresenter {
+
+    private static ArticlePresenter articlePresenter;
+
+    private ArticleApiService apiService;
+
+    private ArticlePresenter(){
+        this.apiService = RetrofitHelper.getRetrofit()
+                .create(ArticleApiService.class);
+    }
+
+    public static synchronized ArticlePresenter getArticlePresenter() {
+        if (articlePresenter == null) {
+            articlePresenter = new ArticlePresenter();
+        }
+
+        return articlePresenter;
+    }
+
+    public void getArticles(@NonNull ArticleContracts.GetArticleCallback getArticleCallback){
+        apiService.getArticles()
+                .enqueue(new Callback<CallResponse<ArrayList<ArticleResult>>>() {
+                    @Override
+                    public void onResponse(Call<CallResponse<ArrayList<ArticleResult>>> call, Response<CallResponse<ArrayList<ArticleResult>>> response) {
+                        if (response.body() != null){
+                            if (response.body().status != 200 || response.body().result == null){
+                                getArticleCallback.onArticleFetchFailed(new Exception(), response.body().message);
+                                return;
+                            }
+
+                            getArticleCallback.onArticlesFetched(response.body().result);
+                        }else{
+                            getArticleCallback.onArticleFetchFailed(new Exception(), "Please try again later.");
+                        }
+                    }
+
+                    @Override
+                    public void onFailure(Call<CallResponse<ArrayList<ArticleResult>>> call, Throwable t) {
+                        getArticleCallback.onArticleFetchFailed(new Exception(), "Please try again later.");
+                    }
+                });
+    }
+
+}