我必须通过 url 中的 json 获取文本。

层次结构如下:

对象>数组>对象>数组>对象。

我想用这段代码获取文本。但是我收到错误 :org.json.JSONException: No value for text

下面是代码:-

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 = "http://2e9b8f52.ngrok.io/api/v1/restaurants?per_page=5&km=1&location=true&lat=19.0558306414&long=72.8339840099";
    private ProgressDialog pDialog;
    private List movieList = new ArrayList();
    private ListView listView;
    private CustomListAdapter adapter;
    @Ghi đè
    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() {
            @Ghi đè
            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();

        // Creating volley request obj
        JsonObjectRequest movieReq = new JsonObjectRequest(Request.Method.GET,
                url, null, new Response.Listener() {
            @Ghi đè
            public void onResponse(JSONObject response) {
                Log.d(TAG, response.toString());
                JSONArray

                        restaurantsJSONArray= null;
                thử {
                    restaurantsJSONArray = response.getJSONArray("restaurants");
                } bắt (JSONException e) {
                    e.printStackTrace();
                }

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

                        JSONObject obj =restaurantsJSONArray.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"));
                        movie.setDistance( obj.getDouble("distance"));
                        movie.settext(obj.getString("text"));
                        movieList.add(movie);
                    } bắt (JSONException e) {
                        e.printStackTrace();
                    }
                }
                adapter.notifyDataSetChanged();
            }
        }, Phản hồi mới.ErrorListener() {
            @Ghi đè
            công khai void onErrorResponse(lỗi VolleyError) {
                VolleyLog.d(TAG, "Error: " + error.getMessage());
                hidePDialog();

            }
        });


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

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

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



}

我附上了 json 数据的快照。在快照中，我们可以看到我必须访问的颜色“Text=15% discount on bill”。

1 Câu trả lời

thử {
    String yourresponseString ="";// this string refer to your api response
    JSONObject jsonObject = new JSONObject(yourresponseString);
    JSONArray objJsonArray = new JSONArray(jsonObject.getString("restaurants"));
    for (int i = 0; i < objJsonArray.length(); i++) {
        JSONArray objInnerJsonArray = objJsonArray.getJSONObject(i).getJSONArray("restaurant_offers");
        for (int j = 0; j < objInnerJsonArray.length(); j++) {
            //Here you can acess youe bill discount value
            JSONObject objInnerJSONObject = objInnerJsonArray.getJSONObject(j);
            System.out.println("Discount==>" + objInnerJSONObject.getString("text"));
        }
    }
} bắt (JSONException e) {
    e.printStackTrace();
}

你可以像这样解析。使用这个类你可以解析任何类型的层次结构。

关于android - 如何在json中访问对象>数组>对象>数组>对象？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39077362/