如何从匿名内部类存储/复制对象数组？

Question

我正在开发一个android项目，并且在如何从响应中复制数据方面陷入困境。我想知道是否有一种简单的方法，因为我的方法行不通。当我从public void onResponse（ResultItem [] response）打印元素时，我可以看到内容存在。但是，以后打印时，该元素不再存在。

public class MainActivity extends AppCompatActivity{   
    ResultItem[] resultItemArray;
    ArrayList<String> jsonArrayList;

    public void getRESTResults(View view) throws MalformedURLException, AuthFailureError {
        RequestQueue queue = Volley.newRequestQueue(this);
        String url = "https://rest.opensubtitles.org/search/query-" + query.getText();
        GsonRequest<ResultItem[]> gsonRequest = null;
        jsonArrayList = new ArrayList<>();

        try {
            gsonRequest = new GsonRequest<ResultItem[]>(Request.Method.GET,url, ResultItem[].class, getHeaders(), new Response.Listener<ResultItem[]>() {
                @Override
                public void onResponse(ResultItem[] response) {
                    Gson gson = new Gson();
                    for(ResultItem item : response){
                        String jsonString = gson.toJson(item);
                        jsonArrayList.add(jsonString);
                        //jsonArrayList contains 500 elements here
                    }
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    error.printStackTrace();
                }
            }) ;
        } catch (AuthFailureError authFailureError) {
            authFailureError.printStackTrace();
        }

        queue.add(gsonRequest);

        ArrayList<ResultItem> resultItems = getResultItemArray();
        for(ResultItem item: resultItems) {
            System.out.println(item.toString());
            //why is this arraylist empty now?
        }
    }


    public ArrayList<ResultItem> getResultItemArray(){
        ArrayList<ResultItem> resultArrayList = new ArrayList<>();
        Gson gson = new Gson();
        for(String str: jsonArrayList){
            ResultItem item = gson.fromJson(str, ResultItem.class);
            resultArrayList.add(item);
        }
        return resultArrayList;
    }
}

这是GsonRequest类

public class GsonRequest<T> extends Request<T> {
    private final Gson gson = new Gson();
    private final Class<T> clazz;
    private final Map<String, String> headers;
    private final Map<String, String> params;
    private final Response.Listener<T> listener;

    /**
     * Make a GET request and return a parsed object from JSON.
     *
     * @param url
     *            URL of the request to make
     * @param clazz
     *            Relevant class object, for Gson's reflection
     * @param headers
     *            Map of request headers
     */
    public GsonRequest(int method, String url, Class<T> clazz,
                       Map<String, String> headers, Map<String, String> params,
                       Response.Listener<T> listener, Response.ErrorListener errorListener) {
        super(method, url, errorListener);
        this.clazz = clazz;
        this.headers = headers;
        this.params = params;
        this.listener = listener;
    }

    /**
     * Recieves header
     *
     * @param method
     * @param url
     * @param clazz
     * @param params
     * @param listener
     * @param errorListener
     */
    public GsonRequest(int method, String url, Class<T> clazz,
                       Map<String, String> params, Response.Listener<T> listener,
                       Response.ErrorListener errorListener) {
        super(method,url, errorListener);
        this.clazz = clazz;
        this.headers = new HashMap<String, String>();
        this.params = params;
        this.listener = listener;
    }

    /**
     * No params or headers
     *
     * @param method
     * @param url
     * @param clazz
     * @param listener
     * @param errorListener
     */
    public GsonRequest(int method, String url, Class<T> clazz,
                       Response.Listener<T> listener, Response.ErrorListener errorListener) {
        super(method, url, errorListener);
        this.clazz = clazz;
        this.headers = new HashMap<String, String>();
        this.params = new HashMap<String, String>();
        this.listener = listener;
    }

    @Override
    public Map<String, String> getHeaders() throws AuthFailureError {
        return headers != null ? headers : super.getHeaders();
    }

    @Override
    public Map<String, String> getParams() throws AuthFailureError {
        return params != null ? params : super.getParams();
    }

    @Override
    protected void deliverResponse(T response) {
        listener.onResponse(response);
    }

    @Override
    protected Response<T> parseNetworkResponse(NetworkResponse response) {
        try {
            String json = new String(response.data,
                    HttpHeaderParser.parseCharset(response.headers));
            return Response.success(gson.fromJson(json, clazz),
                    HttpHeaderParser.parseCacheHeaders(response));
        } catch (UnsupportedEncodingException e) {
            return Response.error(new ParseError(e));
        } catch (JsonSyntaxException e) {
            return Response.error(new ParseError(e));
        }
    }
}

这是我的ResultItem类

public class ResultItem{
    String MovieHash;
    String IDMovieImdb;

    public ResultItem(String MovieHash, String IDMovieImdb){
        this.MovieHash = MovieHash;
        this.IDMovieImdb = IDMovieImdb;
    }

    public String getMovieHash(){
        return MovieHash;
    }

    public String getIDMovieImdb(){
        return IDMovieImdb;
    }

    @Override
    public String toString() {
        return "ResultItem{" +
                "MovieHash='" + MovieHash + '\'' +
                ", IDMovieImdb='" + IDMovieImdb + '\'' +
                '}';
    }
}