如何将Retrofit onResponse方法返回的Json数据发送到其他类？

Question

I wanted to refactor code for simplicity and readability and that's why I want to move the code outside the class and return a result to class whenever the method is called.

Trying:

 ArrayList<MovieReview> movieReview;

    public ArrayList<MovieReview> getReviews(String id) {
    if (NetworkUtil.isNetworkConnected(getActivity())) {

        ApiInterface apiService =
                ApiClient.getClient().create(ApiInterface.class);

        Call<MovieReviewResponse> call = null;

        call = apiService.getMovieReviews(id, BuildConfig.THE_MOVIE_DB_API_KEY);

        call.enqueue(new Callback<MovieReviewResponse>() {
            @Override
            public void onResponse(Call<MovieReviewResponse> call, Response<MovieReviewResponse> response) {
                movieReview= (ArrayList<MovieReview>) response.body().getMovieReviews();
            }

            @Override
            public void onFailure(Call<MovieReviewResponse> call, Throwable t) {
                // Log error here since request failed
                Log.e(TAG, t.toString());
            }
        });

    }
  return movieReview;
}

Output: if I used array list outside the on response gives null value.

but if I called a method from on response and pass the result movieReview, as a parameter, it works fine.

Previously used:

 public void getReviews(String id) {
    if (NetworkUtil.isNetworkConnected(getActivity())) {

        ApiInterface apiService =
                ApiClient.getClient().create(ApiInterface.class);

        Call<MovieReviewResponse> call = null;

        call = apiService.getMovieReviews(id, BuildConfig.THE_MOVIE_DB_API_KEY);

        call.enqueue(new Callback<MovieReviewResponse>() {
            @Override
            public void onResponse(Call<MovieReviewResponse> call, Response<MovieReviewResponse> response) {
                movieReview = (ArrayList<MovieReview>) response.body().getMovieReviews();
                setData(movieReview);
            }

            @Override
            public void onFailure(Call<MovieReviewResponse> call, Throwable t) {
                // Log error here since request failed
                Log.e(TAG, t.toString());
            }
        });

    }

}`

Answer 1

Instead of using only Retrofit make use of RxAndroid . By using this you will get response of Observable<T> which consists of three Override methods onCompleted() , onError() and onNext() . In onNext() method call your specific activity, pass your data through putExtra and get through getExtra .

Answer 2

Output: if I used array list outside the on response gives null value

Because that is how asyncronus methods work. Your return happens before onResponse ever happens, so the list object is null.

Tip: In ideal situations, you want to always return an empty list, not null anyway.

---

Rename your method.

public ArrayList<MovieReview> getReviews(String id)

To Instead

public ArrayList<MovieReview> getReviews(String id, Callback<MovieReviewResponse> callback)

---

Replace this code

call.enqueue(new Callback<MovieReviewResponse>() {
    ...
});

With this

call.enqueue(callback);

---

Wherever you call that method

// In Activity
String id = "X";
api.getReviews(id); 

Now do....

// In Activity
String id = "X";
api.getReviews(id, new Callback<MovieReviewResponse>() {
    ...
});

And now from within onResponse , you can update a ListView adapter, or whatever you need to do