android - API 请求通过本地主机工作但不通过网络服务器工作

Question

我正在尝试将 json 数据提取到我的 android 应用程序中。当我使用本地服务器时它工作正常，但是当我将它迁移到 Web 服务器时它不工作。我检查了浏览器中的 api 链接，它们在浏览器中提供了数据

这是我在错误日志中得到的:

E/com.newrelic.android: TransactionStateUtil: Attempting to convert network exception java.net.SocketTimeoutException to error code.
E/com.newrelic.android: HttpsURLConnectionExtension: java.io.IOException: CountingInputStream: input stream cannot be null
E/final123: http://shopcite.rf.gd/shopcite/fetch_hotels.php?city=mathura&origin=18.5914802,73.7075401

最后一行是获取数据的那一行。我正在通过 AsyncTask 在 android 中获取结果，因此在主线程上没有完成任何工作。

public class hotelList extends AsyncTask<String, Integer, List<HotelModel>>{
    @Override
    protected List<HotelModel> doInBackground(String... strings) {
        List<HotelModel> hotelModelList = new ArrayList<>();
        if (!dataSet) {
            HttpHandler sh = new HttpHandler();
            jsonStr = sh.makeServiceCall(HotelURL + CONSTANTS.city+"&origin=" + CONSTANTS.origin);
            Log.e("final123", HotelURL + CONSTANTS.city+"&origin=" + CONSTANTS.origin);
            dataSet = true;
            if (jsonStr != null) {
                try {
                    JSONArray listArray = new JSONArray(jsonStr);
                    for (int i = 0; i < listArray.length(); i++) {
                        JSONObject hotelObject = listArray.getJSONObject(i);
                        HotelModel hotelModel = new HotelModel();
                        hotelModel.setName(hotelObject.getString("name"));
                        hotelModel.setAddr(hotelObject.getString("addr"));
                        hotelModel.setCateg(hotelObject.getString("categ"));
                        hotelModel.setImg(CONSTANTS.server_domain+hotelObject.getString("image"));
                        hotelModel.setPrice(hotelObject.getInt("price"));
                        hotelModel.setRating((float) hotelObject.getDouble("rating"));
                        hotelModel.setHotel_id(hotelObject.getInt("hotel_id"));
                        hotelModel.setDist(hotelObject.getInt("dist"));
                        hotelModelList.add(hotelModel);
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }else {
                if (jsonStr != null) {
                    try {
                        JSONArray listArray = new JSONArray(jsonStr);
                        for (int i = 0; i < listArray.length(); i++) {
                            JSONObject hotelObject = listArray.getJSONObject(i);
                            HotelModel hotelModel = new HotelModel();
                            hotelModel.setName(hotelObject.getString("name"));
                            hotelModel.setAddr(hotelObject.getString("addr"));
                            hotelModel.setCateg(hotelObject.getString("categ"));
                            hotelModel.setImg(CONSTANTS.server_domain+hotelObject.getString("image"));
                            hotelModel.setPrice(hotelObject.getInt("price"));
                            hotelModel.setRating((float) hotelObject.getDouble("rating"));
                            hotelModel.setHotel_id(hotelObject.getInt("hotel_id"));
                            hotelModel.setDist(hotelObject.getInt("dist"));
                            hotelModelList.add(hotelModel);
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }if (orderby.equals("location")) {
                        Log.e("ll", String.valueOf(hotelModelList.get(0).getDist()));
                        Collections.sort(hotelModelList, new Comparator<HotelModel>() {
                            @Override
                            public int compare(HotelModel o1, HotelModel o2) {
                                return o1.getDist() - o2.getDist();
                            }
                        });
                    }
                    else if (orderby.equals("price")) {
                        Collections.sort(hotelModelList, new Comparator<HotelModel>() {
                            @Override
                            public int compare(HotelModel o1, HotelModel o2) {
                                return o1.getPrice() - o2.getPrice();
                            }
                        });
                    } else if (orderby.equals("rating")) {
                        Collections.sort(hotelModelList, new Comparator<HotelModel>() {
                            @Override
                            public int compare(HotelModel o1, HotelModel o2) {
                                return (int) (o2.getRating() * 100 - o1.getRating() * 100);
                            }
                        });
                    }
                }
        }
            return hotelModelList;
        }
    @Override
    protected void onPostExecute(List<HotelModel> hotelModels) {
        super.onPostExecute(hotelModels);
        HotelAdapter hotelAdapter = new HotelAdapter(hotel_populate_list.this,R.layout.item_hotel,hotelModels);
        hotelPopulate.setAdapter(hotelAdapter);
        progressDialog.dismiss();
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressDialog=new ProgressDialog(hotel_populate_list.this);
        progressDialog.setIndeterminate(true);
        progressDialog.setCancelable(false);
        progressDialog.setMessage("Gathering details from Internet...");
        progressDialog.show();
    }
}

应用程序没有崩溃，但我看不到获取的结果。请注意，当我通过本地主机执行此操作时，它正在获取结果

我试图将以下内容放入 Log.e 中以查看是否正在获取 json 数据。它没有获取，它给了我空指针异常

jsonStr = sh.makeServiceCall(HotelURL + CONSTANTS.city+"&origin=" + CONSTANTS.origin);

添加 makeServiceCall 方法

public String makeServiceCall(String reqUrl) {
    String response = null;
    try {
        URL url = new URL(reqUrl);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");

        // read the response
        InputStream in = new BufferedInputStream(conn.getInputStream());
        response = convertStreamToString(in);
    } catch (MalformedURLException e) {
        Log.e(TAG, "MalformedURLException: " + e.getMessage());
    } catch (ProtocolException e) {
        Log.e(TAG, "ProtocolException: " + e.getMessage());
    } catch (IOException e) {
        Log.e(TAG, "IOException: " + e.getMessage());
    } catch (Exception e) {
        Log.e(TAG, "Exception: " + e.getMessage());
    }
    return response;
}

private String convertStreamToString(InputStream is) {
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    StringBuilder sb = new StringBuilder();

    String line;
    try {
        while ((line = reader.readLine()) != null) {
            sb.append(line).append('\n');
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return sb.toString();
}

更新:

我进一步检查，这与虚拟主机阻止来自移动/安卓的流量有关。我尝试了多个主机，不幸的是这对所有人都是一样的。有没有办法让这些调用看起来像是来自浏览器？

Answer 1

服务器连接使用http协议(protocol)。您将需要设置 https，或者如果您需要它是 http，并且您的应用程序的目标是 Api 级别 28 或更高级别，您需要在您的 list 中进行设置:

<application
...
android:usesCleartextTraffic="true"
...>

如果不行，问题出在服务器端