通过json解析没有获取数据

Question

我在我的代码中解析json数据。 json数据如图所示。为什么我在击中网址时没有得到。 我认为访问问题。在对象之后的数组中的餐馆然后在代码访问问题中的项目。

所以有人可以帮助我吗？我缺少这个？

public class ListViewActivity extends Activity {
    // Log tag
    private static final String TAG = ListViewActivity.class.getSimpleName();
    // change here url of server api
    private static final String url = "https://comida-95724.herokuapp.com/api/v1/restaurants/get_featured_restaurants";
    private ProgressDialog pDialog;
    private List<Movie> movieList = new ArrayList<Movie>();
    private ListView listView;
    private CustomListAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_listview);
        listView = (ListView) findViewById(R.id.list);
        adapter = new CustomListAdapter(this, movieList);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Movie movie = movieList.get(position);
                Intent intent = new Intent(ListViewActivity.this, SecondActivity.class);
                intent.putExtra("name", movie.getName());
                intent.putExtra("average_ratings", movie.getAverage_ratings());
                intent.putExtra("full_address", movie.getAddress());
                intent.putExtra("image_url", movie.getThumbnailUrl());
                intent.putExtra("cuisine",movie.getCuisine());
                intent.putExtra("cost",movie.getCost());
                startActivity(intent);

            }
        });
        listView.setAdapter(adapter);
         pDialog = new ProgressDialog(this);
        // Showing progress dialog before making http request
        pDialog.setMessage("Please Keep patience.Its loading...");

        pDialog.show();

         JsonObjectRequest movieReq = new JsonObjectRequest(Request.Method.GET,
        url, null, new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        Log.d(TAG, response.toString());
                        hidePDialog();
                        // Parsing json
                        for (int i = 0; i < response.length(); i++) {
                            try {
                                JSONArray restaurantsJSONArray=response.getJSONArray("restaurants");
                                JSONObject obj = response.getJSONObject(i);
                                Movie movie = new Movie();
                                //movie.setTitle(obj.getString("title"));
                                movie.setName(obj.getString("name"));
                                //movie.setThumbnailUrl(obj.getString("image"));
                                movie.setThumbnailUrl(obj.getString("org_image_url"));
                                movie.setAverage_ratings(obj.getString("average_ratings"));
                                movie.setCuisine(obj.getString("cuisine"));
                                movie.setAddress(obj.getJSONObject("address").getString("area"));
                               // movie.setAddress(obj.getJSONObject("address").getString("full_address"));
                                movie.setCost(obj.getString("cost"));

                                movieList.add(movie);
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }


                        adapter.notifyDataSetChanged();
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                VolleyLog.d(TAG, "Error: " + error.getMessage());
                hidePDialog();

            }
        });


        AppController.getInstance().addToRequestQueue(movieReq);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        hidePDialog();
    }

    private void hidePDialog() {
        if (pDialog != null) {
            pDialog.dismiss();
            pDialog = null;
        }
    }



}

Answer 1

试试这个：

JsonObjectRequest movieReq = new JsonObjectRequest(Method.GET,
        urlJsonObj, null, new Response.Listener<JSONObject>() 

访问你的jsonArray：

JSONArray restaurantsJSONArray=response.getJSONArray("restaurants");

试试这个：

JsonObjectRequest movieReq = new JsonObjectRequest(Request.Method.GET,
        url, null, new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        Log.d(TAG, response.toString());
                        JSONArray   

           restaurantsJSONArray=response.getJSONArray("restaurants");

                        hidePDialog();
                        // Parsing json
                        for (int i = 0; i < restaurantsJSONArray.length(); i++) {
                            try {

                                JSONObject obj = response.getJSONObject(i);
                                Movie movie = new Movie();
                                //movie.setTitle(obj.getString("title"));
                                movie.setName(obj.getString("name"));
                                //movie.setThumbnailUrl(obj.getString("image"));
                                movie.setThumbnailUrl(obj.getString("org_image_url"));
                                movie.setAverage_ratings(obj.getString("average_ratings"));
                                movie.setCuisine(obj.getString("cuisine"));
                                movie.setAddress(obj.getJSONObject("address").getString("area"));
                               // movie.setAddress(obj.getJSONObject("address").getString("full_address"));
                                movie.setCost(obj.getString("cost"));

                                movieList.add(movie);
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }


                        adapter.notifyDataSetChanged();
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                VolleyLog.d(TAG, "Error: " + error.getMessage());
                hidePDialog();

            }
        });


        AppController.getInstance().addToRequestQueue(movieReq);
    }

Answer 2

使用JsonObjectRequest代替JsonArrayRequest，因为帖子图片包含JSONObject作为根项而不是JSONArray。

且restaurants是JSONArray的{​​{1}}。首先获取JSONObject JSONObject参数的restaurants，然后从中获取所有JSONObject：

onResponse

现在使用for循环从JSONArray restaurantsJSONArray=response.getJSONArray("restaurants"); 获取JSONObject。