title: cannot put values inside Array List
body: <p>I've tried to set values inside <code>movies</code> ArrayList in <code>BlogRepository</code> class.
  but I couldn't find the results in the end.</p>
  
  <p>I want to modify the example so that the storage inside the ArrayList is movies.
  so the example works and the results show then the example works. </p>
  
  <p>json data :</p>
  
  <pre><code>[
        {
          "albumId": 1,
          "id": 1,
          "title": "accusamus beatae ad facilis cum similique qui sunt",
          "url": "https://via.placeholder.com/600/92c952",
          "thumbnailUrl": "https://via.placeholder.com/150/92c952"
        },
        {
          "albumId": 1,
          "id": 2,
          "title": "reprehenderit est deserunt velit ipsam",
          "url": "https://via.placeholder.com/600/771796",
          "thumbnailUrl": "https://via.placeholder.com/150/771796"
        },
        {
          "albumId": 1,
          "id": 3,
          "title": "officia porro iure quia iusto qui ipsa ut modi",
          "url": "https://via.placeholder.com/600/24f355",
          "thumbnailUrl": "https://via.placeholder.com/150/24f355"
        }
  ]
  </code></pre>
  
  <p>Code:</p>
  
  <pre><code>    // 
      public class BlogRepository {
  
          private ArrayList&lt;Blog2&gt; movies = new ArrayList&lt;&gt;();
  
          private MutableLiveData&lt;List&lt;Blog2&gt;&gt; mutableLiveData = new MutableLiveData&lt;&gt;();
  
          private Application application;
  
          public BlogRepository(Application application){
  
              this.application = application;
          }
  
          public MutableLiveData&lt;List&lt;Blog2&gt;&gt; getMutableLiveData() {
              RestApiService service = RetrofitInstance.getApiService();
              Call&lt;List&lt;BlogWrapper&gt;&gt; call = service.getPopularBlog();
              call.enqueue(new Callback&lt;List&lt;BlogWrapper&gt;&gt;(){
                  @Override
                  public void onResponse(Call&lt;List&lt;BlogWrapper&gt;&gt; call, Response&lt;List&lt;BlogWrapper&gt;&gt; response) {
                      List&lt;BlogWrapper&gt; mBlogWrapper = response.body();
                      for (int i=0; i&lt;mBlogWrapper.size(); i++) {
                         movies = (ArrayList&lt;Blog2&gt;) mBlogWrapper.get(i).getBlog();
                          //Log.d("trace_movies : ",""+ movies);
                      }
                  }
                  @Override
                  public void onFailure(Call&lt;List&lt;BlogWrapper&gt;&gt; call, Throwable t) {
                    //  Toast.makeText(MainActivity.this, "Unable to load users", Toast.LENGTH_SHORT).show();
                      Log.e("trace_2",""+t.getMessage().toString());
                  }
              });
              return mutableLiveData;
          }
  
      }
  
      // 
  
      public class Blog2 {
  
          @SerializedName("albumId")
          private int albumId;
          @SerializedName("id")
          private int id;
          @SerializedName("title")
          private String title;
          @SerializedName("url")
          private String url;
          @SerializedName("thumbnailUrl")
          private String thumbnailUrl;
  
  
          public void setAlbumId(int albumId) {
              this.albumId = albumId;
          }
  
          public void setId(int id) {
              this.id = id;
          }
  
          public void setTitle(String title) {
              this.title = title;
          }
  
          public void setUrl(String url) {
              this.url = url;
          }
  
          public void setThumbnailUrl(String thumbnailUrl) {
              this.thumbnailUrl = thumbnailUrl;
          }
  
  
          public int getAlbumId() {
              return albumId;
          }
  
          public int getId() {
              return id;
          }
  
          public String getTitle() {
              return title;
          }
  
          public String getUrl() {
              return url;
          }
  
          public String getThumbnailUrl() {
              return thumbnailUrl;
          }
      }
  
      /// 
  
      public class BlogWrapper {
  
          @SerializedName("data")
          private List&lt;Blog2&gt; mData;
          @SerializedName("error")
          private Boolean mError;
          @SerializedName("message")
          private String mMessage;
          @SerializedName("status")
          private String mStatus;
  
          public List&lt;Blog2&gt;getBlog() {
              return mData;
          }
  
          public void setBlog(List&lt;Blog2&gt; data) {
              mData = data;
          }
  
          public Boolean getError() {
              return mError;
          }
  
          public void setError(Boolean error) {
              mError = error;
          }
  
          public String getMessage() {
              return mMessage;
          }
  
          public void setMessage(String message) {
              mMessage = message;
          }
  
          public String getStatus() {
              return mStatus;
          }
  
          public void setStatus(String status) {
              mStatus = status;
          }
  
      }
  
      /// 
  
      public interface RestApiService {
  
        @GET("/photos")
        public Call&lt;List&lt;BlogWrapper&gt;&gt; getPopularBlog();
  
      }
  
      // 
  
      public class RetrofitInstance {
  
          private static Retrofit retrofit = null;
          public static final String BASE_URL_ = "https://jsonplaceholder.typicode.com/albums/1/";
           // public static final String BASE_URL_ = "https://androidwave.com/api/";
           public static RestApiService getApiService() {
               Gson gson = new GsonBuilder().setLenient().create();
              if (retrofit == null) {
                  retrofit = new retrofit2.Retrofit
                   .Builder()
                     .baseUrl(BASE_URL_)
                      .addConverterFactory(GsonConverterFactory.create(gson))
                        .build();
  
              }
              return retrofit.create(RestApiService.class);
          }
      }
  </code></pre>